【０００１】[0001]
【発明の属する技術分野】本発明は、複数のサブキャリ
アを用い、狭帯域化した信号に変換して伝送するもので
あり、特に複数のサブキャリアの中から伝送状態の良好
な複数のサブキャリアを選択して用いるサブキャリア信
号伝送方法および装置に関する。なお、本発明のサブキ
ャリア信号伝送方法および装置は、特に大容量の多値変
調方式に対して有効である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a plurality of subcarriers, converts the signals into narrow-band signals, and transmits the converted signals. And a subcarrier signal transmission method and apparatus. The subcarrier signal transmission method and apparatus of the present invention are particularly effective for a large-capacity multi-level modulation scheme.
【０００２】[0002]
【従来の技術】マルチキャリア信号伝送装置には、複数
のサブキャリアの中から伝送状態の良好な複数のサブキ
ャリアを選択して用いるサブキャリア選択方式を適用し
ているものがある。2. Description of the Related Art Some multicarrier signal transmission apparatuses employ a subcarrier selection method in which a plurality of subcarriers having good transmission conditions are selected and used from among a plurality of subcarriers.
【０００３】図６は、サブキャリア選択方式を適用した
従来のマルチキャリア信号伝送装置の構成例を示す。図
において、マルチキャリア信号伝送装置は、送信側装置
と受信側装置により構成される。FIG. 6 shows a configuration example of a conventional multicarrier signal transmission apparatus to which a subcarrier selection method is applied. In the figure, a multi-carrier signal transmission device includes a transmitting device and a receiving device.
【０００４】送信側装置では、送信ビット系列Ａ２がシ
リアル・パラレル変換手段１０に入力され、ビット組か
らなるパラレル信号Ｂ２に変換されて送信側指定サブキ
ャリア選択手段２０に入力される。送信側指定サブキャ
リア選択手段２０では、受信側の使用サブキャリア指定
手段９０からフィードバックされる指定サブキャリア情
報信号Ｋ２に基づき、パラレル信号Ｂ２の送信に用いる
サブキャリアが選択される。なお、送信側指定サブキャ
リア選択手段２０で選択されなかったサブキャリアは、
受信側で品質測定を行うために任意のダミービット系列
の送信に用いる。送信側指定サブキャリア選択手段２０
の出力Ｃ２はサブキャリア信号合成・送信手段３０に入
力され、各サブキャリア信号が合成された送信信号Ｄ２
となる。In the transmitting apparatus, the transmission bit sequence A2 is input to the serial / parallel conversion means 10, converted into a parallel signal B2 consisting of a bit set, and input to the transmission-side designated subcarrier selection means 20. The transmission-side designated subcarrier selection unit 20 selects a subcarrier used for transmitting the parallel signal B2 based on the designated subcarrier information signal K2 fed back from the used subcarrier designation unit 90 on the reception side. The subcarriers not selected by the transmission-side designated subcarrier selection means 20 are:
It is used for transmitting an arbitrary dummy bit sequence in order to perform quality measurement on the receiving side. Transmission-side designated subcarrier selection means 20
Is output to the subcarrier signal combining / transmitting means 30, and the transmission signal D2
Becomes
【０００５】ここで、サブキャリア信号合成・送信手段
３０は、例えばシリアル・パラレル変換回路と、直交周
波数分割多重（ＯＦＤＭ：Orthogonal Frequency Divis
ionMultiplexing) を適用した逆離散フーリエ変換（Ｉ
ＤＦＴ：Inverse discrete Fourier Transform) 回路に
より実現される（参考文献：S.B.Weinstein et al.,"Da
ta transmission by frequency-division multiplexing
using the discreteFourier transform", IEEE Trans.
Commun.Technol., vol.COM-19, pp.628-634,Oct. 197
1)。Here, the subcarrier signal combining / transmitting means 30 includes, for example, a serial / parallel conversion circuit and an orthogonal frequency division multiplex (OFDM).
Inverse discrete Fourier transform (I
DFT (Inverse discrete Fourier Transform) circuit (Reference: SBWeinstein et al., "Da
ta transmission by frequency-division multiplexing
using the discreteFourier transform ", IEEE Trans.
Commun.Technol., Vol.COM-19, pp.628-634, Oct. 197
1).
【０００６】受信側装置では、送信信号Ｄ２をマルチキ
ャリア信号受信・分離手段４０に入力し、各サブキャリ
ア信号Ｅ２に分離する。マルチキャリア信号受信・分離
手段４０は、ＯＦＤＭを適用したＤＦＴ(discrete Four
ier Transform)回路により実現できる。[0006] In the receiving side device, the transmission signal D2 is input to the multicarrier signal receiving / separating means 40 and separated into each subcarrier signal E2. The multicarrier signal receiving / separating means 40 is a DFT (discrete four
ier Transform) circuit.
【０００７】サブキャリア信号Ｅ２は、受信側指定サブ
キャリア選択手段５０およびサブキャリア信号品質測定
手段８０に入力される。受信側指定サブキャリア選択手
段５０は、使用サブキャリア指定手段９０から送信側に
送出した指定サブキャリア情報信号Ｋ２に基づき、サブ
キャリア信号Ｅ２から受信するサブキャリア信号を選択
する。また、サブキャリア信号品質測定手段８０は各サ
ブキャリアの品質を測定し、その測定結果情報Ｊ２を使
用サブキャリア指定手段９０に与える。使用サブキャリ
ア指定手段９０は、測定結果情報Ｊ２に基づいて予め指
定された本数のサブキャリアを信号伝送用として指定
し、その指定サブキャリア情報信号Ｋ２を送信側指定サ
ブキャリア選択手段２０および受信側指定サブキャリア
選択手段５０に送出する。[0007] The subcarrier signal E2 is input to the receiving-side designated subcarrier selecting means 50 and the subcarrier signal quality measuring means 80. The receiving-side designated subcarrier selecting means 50 selects a subcarrier signal to be received from the subcarrier signal E2 based on the designated subcarrier information signal K2 sent from the used subcarrier specifying means 90 to the transmitting side. Further, the subcarrier signal quality measuring means 80 measures the quality of each subcarrier and gives the measurement result information J2 to the used subcarrier specifying means 90. The used subcarrier designating means 90 designates a predetermined number of subcarriers for signal transmission based on the measurement result information J2, and designates the designated subcarrier information signal K2 to the transmitting side designated subcarrier selecting means 20 and the receiving side. It is transmitted to the designated subcarrier selection means 50.
【０００８】受信側指定サブキャリア選択手段５０から
出力されるサブキャリア信号Ｆ２は、検波手段６０で検
波され、復調信号Ｇ２としてパラレル・シリアル変換手
段７０に入力され、送信ビット系列Ａ２と同様なシリア
ン信号Ｈ２に変換される。なお、検波方式には、遅延検
波または同期検波を用いることができる。[0008] The subcarrier signal F2 output from the receiving side designated subcarrier selection means 50 is detected by the detection means 60, input to the parallel-serial conversion means 70 as a demodulated signal G2, and transmitted in the same manner as the transmission bit sequence A2. The signal is converted to a signal H2. It should be noted that delay detection or synchronous detection can be used as the detection method.
【０００９】[0009]
【発明が解決しようとする課題】ところで、従来のマル
チキャリア信号伝送装置におけるサブキャリア選択方式
では、受信したすべてのサブキャリア信号の品質を測定
し、その中から使用するサブキャリアを選択している。
そのため、サブキャリア数の増加に伴い、サブキャリア
選択のための回路規模が増大し、実現が困難になる場合
があった。一方、消費電力の観点からは回路規模の低減
が要請されている。By the way, in the subcarrier selection system in the conventional multicarrier signal transmission apparatus, the quality of all the received subcarrier signals is measured, and the subcarrier to be used is selected from the measured quality. .
For this reason, with an increase in the number of subcarriers, the circuit scale for selecting subcarriers increases, which may make implementation difficult. On the other hand, from the viewpoint of power consumption, a reduction in circuit scale is required.
【００１０】本発明は、サブキャリア数が増加した場合
でもサブキャリア選択に関わる回路規模の増大を最小限
に抑えることができるマルチキャリア信号伝送方法およ
び装置を提供することを目的とする。[0010] It is an object of the present invention to provide a multicarrier signal transmission method and apparatus capable of minimizing an increase in the circuit scale related to subcarrier selection even when the number of subcarriers increases.
【００１１】[0011]
【課題を解決するための手段】本発明のマルチキャリア
信号伝送方法および装置は、選択可能な全サブキャリア
をサブキャリア間周波数間隔が最大になるように複数の
グループに分割する。そして、使用するサブキャリアを
選択する際に、グループごとに使用するサブキャリアを
指定する。このようにグループ化することにより、一度
に比較するサブキャリア数を減少させることができる。
また、全サブキャリア数が増加した場合でも、グループ
数を増加させることにより対応できる。SUMMARY OF THE INVENTION A multicarrier signal transmission method and apparatus of the present invention divides all selectable subcarriers into a plurality of groups such that the intersubcarrier frequency spacing is maximized. Then, when selecting the subcarrier to be used, the subcarrier to be used is specified for each group. By grouping in this way, the number of subcarriers to be compared at one time can be reduced.
Further, even when the number of all subcarriers increases, it can be dealt with by increasing the number of groups.
【００１２】[0012]
【発明の実施の形態】図１は、本発明のマルチキャリア
信号伝送装置の実施形態を示す。図において、送信側装
置のシリアル・パラレル変換手段１０およびサブキャリ
ア信号合成・送信手段３０、受信側装置のマルチキャリ
ア信号受信・分離手段４０、検波手段６０、パラレル・
シリアル変換手段７０およびサブキャリア信号品質測定
手段８０は、図６に示す従来のものと同じである。FIG. 1 shows an embodiment of a multicarrier signal transmission apparatus according to the present invention. In the figure, a serial-parallel conversion means 10 and a subcarrier signal synthesizing / transmitting means 30 of a transmitting apparatus, a multicarrier signal receiving / separating means 40, a detecting means 60, a parallel / parallel signal of a receiving apparatus are shown.
The serial conversion means 70 and the subcarrier signal quality measurement means 80 are the same as the conventional one shown in FIG.
【００１３】本実施形態では、従来の送信側指定サブキ
ャリア選択手段２０に代えて送信側グループ毎指定サブ
キャリア選択手段２１を備え、従来の受信側指定サブキ
ャリア選択手段５０に代えて受信側グループ毎指定サブ
キャリア選択手段５１、従来の使用サブキャリア指定手
段９０に代えてグループ毎使用サブキャリア指定手段９
１を備えることを特徴とする。In the present embodiment, a subgroup selection unit 21 for each transmission side group is provided in place of the conventional subcarrier selection unit 20 for transmission side. Each sub-carrier specifying unit 51 and the sub-carrier specifying unit 9 instead of the conventional sub-carrier specifying unit 90
1 is provided.
【００１４】送信側グループ毎サブキャリア選択手段２
１は、受信側のグループ毎使用サブキャリア指定手段９
１からフィードバックされるグループ毎指定サブキャリ
ア情報信号Ｋ１に基づき、シリアル・パラレル変換手段
１０から出力されるパラレル信号Ｂ１の送信に用いるサ
ブキャリアを、Ｎ／Ｍ個のグループごとにＬ波ずつ選択
する。[0014] Subcarrier selection means 2 for each transmission side group
1 is a subcarrier designating means 9 for each group used on the receiving side.
Based on the group-specific designated subcarrier information signal K1 fed back from 1, the subcarriers used for transmitting the parallel signal B1 output from the serial / parallel conversion means 10 are selected for each of the N / M groups by L waves. .
【００１５】ここで、図２に示すように、全サブキャリ
ア数をＮ、各グループ内のサブキャリア数をＭとする。
また、各グループのサブキャリア間の周波数間隔が最大
になるようにグループ化する。その目的は、移動通信伝
搬環境における遅延波（反射波）の遅延量とサブキャリ
アの周波数間隔との間に図４に示すような相関関係があ
るので、サブキャリア間の相関が小さくなるようにサブ
キャリア間の周波数間隔を大きくし、サブキャリアの選
択送信による効果を高めるためである。Here, as shown in FIG. 2, the number of all subcarriers is N, and the number of subcarriers in each group is M.
Grouping is performed so that the frequency interval between subcarriers in each group is maximized. The purpose is to provide a correlation between the amount of delay of a delayed wave (reflected wave) and the frequency interval of subcarriers in a mobile communication propagation environment as shown in FIG. This is to increase the frequency interval between subcarriers and enhance the effect of selective transmission of subcarriers.
【００１６】受信側グループ毎指定サブキャリア選択手
段５１は、グループ毎使用サブキャリア指定手段９１か
ら送信側に送出したグループ毎指定サブキャリア情報信
号Ｋ１に基づき、サブキャリア信号Ｅ１からＮ／Ｍ個の
グループごとにＬ波ずつ受信するサブキャリア信号を選
択する。The receiving-side group-specific designated subcarrier selecting means 51, based on the group-specific designated subcarrier information signal K1 transmitted from the group-specific used subcarrier specifying means 91 to the transmitting side, obtains N / M number of subcarrier signals from the subcarrier signal E1. A subcarrier signal to be received by L wave is selected for each group.
【００１７】グループ毎使用サブキャリア指定手段９１
は、サブキャリア信号品質測定手段８０の測定結果情報
Ｊ１に基づいて、Ｍ波のサブキャリアからなる各グルー
プごとにＬ波のサブキャリアを信号伝送用として指定
し、そのグループ毎指定サブキャリア情報信号Ｋ１を送
信側グループ毎指定サブキャリア選択手段２１および受
信側グループ毎指定サブキャリア選択手段５１に送出す
る。Use subcarrier designating means 91 for each group
Specifies an L-wave subcarrier for signal transmission for each group of M-wave subcarriers based on the measurement result information J1 of the subcarrier signal quality measuring means 80, and specifies the group-specific subcarrier information signal K1 is transmitted to the transmission-side group-specific subcarrier selection means 21 and the reception-side group-specific subcarrier selection means 51.
【００１８】図３は、グループ毎使用サブキャリア指定
手段９１および送信側グループ毎サブキャリア選択手段
２１の動作例を示す。ここでは、全サブキャリア数Ｎが
12、各グループ内のサブキャリア数Ｍが４、グループ数
Ｎ／Ｍが３、グループごとに選択するサブキャリア数Ｌ
が２の場合を示す。図中、カッコ内の表記は（グループ
番号，グループ内サブキャリア番号）であり、（１，
１）〜（３，４）の12のサブキャリアがあり、サブキャ
リア信号品質測定手段８０でそれぞれの受信電力が測定
される。FIG. 3 shows an operation example of the group-specific subcarrier specifying means 91 and the transmitting-side group-specific subcarrier selecting means 21. Here, the total number of subcarriers N is
12, the number of subcarriers M in each group is 4, the number of groups N / M is 3, the number of subcarriers L selected for each group
Shows the case of 2. In the figure, the notation in parentheses is (group number, subcarrier number in group), and (1,
There are 12 subcarriers 1) to (3, 4), and the received power of each is measured by the subcarrier signal quality measuring means 80.
【００１９】グループ毎使用サブキャリア指定手段９１
は、各グループごとにサブキャリアの受信電力の大きい
方から２つのサブキャリアを指定する。ここでは、
（１，１）、（１，２）、（２，２）、（２，３）、
（３，１）、（３，３）のサブキャリアが指定される。
送信側グループ毎指定サブキャリア選択手段２１では、
この指定されたサブキャリアを選択してパラレル信号Ｂ
１の送信に用いる。受信側グループ毎指定サブキャリア
選択手段５１でも同様に、サブキャリア信号Ｅ１から指
定されたサブキャリア信号を選択する。Subcarrier designation means 91 for each group
Specifies the two subcarriers from the one with the larger received power of the subcarrier for each group. here,
(1,1), (1,2), (2,2), (2,3),
The subcarriers (3, 1) and (3, 3) are designated.
In the transmission side group designated subcarrier selection means 21,
Select this specified subcarrier and select the parallel signal B
1 for transmission. Similarly, the designated subcarrier selection means 51 for each receiving side selects the designated subcarrier signal from the subcarrier signal E1.
【００２０】図５は、本発明のマルチキャリア信号伝送
装置におけるセル誤り率のシミュレーション結果の一例
を示す。ここでは、全サブキャリア数Ｎが32、各グルー
プ内のサブキャリア数Ｍが４、グループ数Ｎ／Ｍが８、
グループごとに選択するサブキャリア数Ｌが２の場合と
し、レイリーフェージング通信路におけるセル誤り率を
遅延検波を適用した場合について求めたものである。な
お、サブキャリア信号品質測定手段では、各サブキャリ
アの受信電力を測定している。FIG. 5 shows an example of a simulation result of the cell error rate in the multicarrier signal transmission apparatus of the present invention. Here, the total number of subcarriers N is 32, the number of subcarriers M in each group is 4, the number of groups N / M is 8,
The number of subcarriers L selected for each group is 2, and the cell error rate in a Rayleigh fading channel is obtained in a case where differential detection is applied. Note that the subcarrier signal quality measuring means measures the received power of each subcarrier.
【００２１】図５に示すように、本発明装置を用いるこ
とにより、例えばグループを構成する４波のサブキャリ
ア中、電力の大きい２波のサブキャリアを選択する簡単
な回路を用いて、大幅な誤り率特性の改善が得られるこ
とがわかる。As shown in FIG. 5, by using the apparatus of the present invention, a significant circuit can be obtained by using a simple circuit for selecting, for example, two sub-carriers having high power among four sub-carriers constituting a group. It can be seen that the error rate characteristics can be improved.
【００２２】[0022]
【発明の効果】以上説明したように、本発明のマルチキ
ャリア信号伝送方法および装置は、使用するサブキャリ
アを選択する際にグループ化することにより、一度に比
較するサブキャリア数を減少させることができ、サブキ
ャリア選択に関わる回路規模を抑制することができる。As described above, the multicarrier signal transmission method and apparatus of the present invention can reduce the number of subcarriers to be compared at one time by grouping when selecting subcarriers to be used. It is possible to suppress the circuit scale related to the subcarrier selection.
【００２３】また、全サブキャリア数が増加した場合で
も、グループ数が増加するようにすれば、サブキャリア
選択に関わる回路規模の増大を最小限に抑えることがで
きる。また、サブキャリア間周波数間隔が最大になるよ
うにグループ化すれば、グループごとに選択されたサブ
キャリア間の相関を低く抑えることができ、グループ化
に伴う誤り率特性の劣化を最小限に抑えることかでき
る。Further, even if the total number of subcarriers is increased, if the number of groups is increased, an increase in the circuit scale related to subcarrier selection can be minimized. Further, if the grouping is performed so that the frequency interval between subcarriers is maximized, the correlation between the subcarriers selected for each group can be suppressed low, and the deterioration of the error rate characteristic due to the grouping is minimized. I can do it.
【図１】本発明のマルチキャリア信号伝送装置の実施形
態を示すブロック図。FIG. 1 is a block diagram showing an embodiment of a multicarrier signal transmission device of the present invention.
【図２】サブキャリアのグループ化を説明する図。FIG. 2 is a diagram illustrating subcarrier grouping.
【図３】グループ毎使用サブキャリア指定手段９１およ
び送信側グループ毎サブキャリア選択手段２１の動作例
を示す図。FIG. 3 is a diagram illustrating an operation example of a group-specific subcarrier specifying unit 91 and a transmitting-side group-specific subcarrier selecting unit 21;
【図４】遅延波（反射波）の遅延量とサブキャリアの周
波数間隔の相関関係を示す図。FIG. 4 is a diagram showing a correlation between a delay amount of a delayed wave (reflected wave) and a frequency interval of a subcarrier.
【図５】本発明のマルチキャリア信号伝送装置における
セル誤り率を示す図。FIG. 5 is a diagram showing a cell error rate in the multicarrier signal transmission device of the present invention.
【図６】サブキャリア選択方式を適用した従来のマルチ
キャリア信号伝送装置の構成例を示すブロック図。FIG. 6 is a block diagram showing a configuration example of a conventional multicarrier signal transmission device to which a subcarrier selection method is applied.
１０ シリアル・パラレル変換手段 ２０ 送信側指定サブキャリア選択手段 ２１ 送信側グループ毎指定サブキャリア選択手段 ３０ サブキャリア信号合成・送信手段 ４０ マルチキャリア信号受信・分離手段 ５０ 受信側指定サブキャリア選択手段 ５１ 受信側グループ毎指定サブキャリア選択手段 ６０ 検波手段 ７０ パラレル・シリアル変換手段 ８０ サブキャリア信号品質測定手段 ９０ 使用サブキャリア指定手段 ９１ グループ毎使用サブキャリア指定手段 DESCRIPTION OF SYMBOLS 10 Serial-parallel conversion means 20 Transmission-side designation subcarrier selection means 21 Transmission-side group designation subcarrier selection means 30 Subcarrier signal synthesis / transmission means 40 Multicarrier signal reception / separation means 50 Reception-side designation subcarrier selection means 51 Reception Subgroup selecting means for each side group 60 Detecting means 70 Parallel / serial converting means 80 Subcarrier signal quality measuring means 90 Used subcarrier specifying means 91 Used subcarrier specifying means for each group
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9211908AJP3035512B2 (en) | 1997-08-06 | 1997-08-06 | Multicarrier signal transmission method and apparatus |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9211908AJP3035512B2 (en) | 1997-08-06 | 1997-08-06 | Multicarrier signal transmission method and apparatus |
| Publication Number | Publication Date |
|---|---|
| JPH1155210Atrue JPH1155210A (en) | 1999-02-26 |
| JP3035512B2 JP3035512B2 (en) | 2000-04-24 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9211908AExpired - Fee RelatedJP3035512B2 (en) | 1997-08-06 | 1997-08-06 | Multicarrier signal transmission method and apparatus |
| Country | Link |
|---|---|
| JP (1) | JP3035512B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001024616A (en)* | 1999-07-02 | 2001-01-26 | Hitachi Denshi Ltd | Transmission method and device |
| JP2002190788A (en)* | 2000-03-17 | 2002-07-05 | Matsushita Electric Ind Co Ltd | Wireless communication device and wireless communication method |
| WO2003085867A1 (en)* | 2002-04-08 | 2003-10-16 | Sharp Kabushiki Kaisha | Radio communication system |
| WO2004021617A1 (en)* | 2002-08-28 | 2004-03-11 | Matsushita Electric Industrial Co., Ltd. | Communication apparatus and communication method |
| WO2005004362A1 (en)* | 2003-07-03 | 2005-01-13 | Matsushita Electric Industrial Co., Ltd. | Multi-carrier communication device and feedback information communication method |
| JP2005502218A (en) | 2000-12-15 | 2005-01-20 | ブロードストーム テレコミュニケイションズ インコーポレイテッド | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| WO2006035841A1 (en)* | 2004-09-29 | 2006-04-06 | Matsushita Electric Industrial Co., Ltd. | Transmitting apparatus, receiving apparatus, communication system and communication method |
| KR100698628B1 (en) | 2004-10-27 | 2007-03-21 | 임재성 | Spreading method and transmission apparatus of orthogonal frequency division multiple access system, orthogonal frequency division multiple access method |
| WO2008007506A1 (en)* | 2006-07-10 | 2008-01-17 | Osaka University | Transfer method, transfer system, transmitter apparatus and receiver apparatus |
| JP2008048288A (en)* | 2006-08-18 | 2008-02-28 | Sony Corp | Radio communication system and radio communication device |
| KR100828478B1 (en) | 2005-11-28 | 2008-05-13 | 삼성전자주식회사 | Low complexity dynamic channel allocator and method in multi-carrier communication system |
| JP2009081873A (en)* | 2001-05-17 | 2009-04-16 | Qualcomm Inc | Transmission in multi-channel communication system using selective channel power control |
| JP2009159633A (en)* | 2009-04-13 | 2009-07-16 | Fujitsu Ltd | Multi-carrier direct spread transmitter / receiver system, multi-carrier direct spread transmitter / receiver, multi-carrier direct spread transmitter and multi-carrier direct spread receiver, multi-carrier transmit / receive system, multi-carrier transmitter / receiver, multi-carrier transmitter and multi-carrier receiver |
| JP2009165126A (en)* | 2001-06-26 | 2009-07-23 | Qualcomm Inc | Method and apparatus for processing data for transmission in multi-channel communication system using selective channel transmission |
| JP2009260980A (en)* | 2009-06-12 | 2009-11-05 | Panasonic Corp | Base station device and transmission method |
| US7822132B2 (en) | 2004-11-02 | 2010-10-26 | Nec Corporation | OFDM communication system |
| JP2012120213A (en)* | 2001-03-09 | 2012-06-21 | Adaptix Inc | Communication system using ofdm for one direction and dsss for another direction |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001024616A (en)* | 1999-07-02 | 2001-01-26 | Hitachi Denshi Ltd | Transmission method and device |
| JP2002190788A (en)* | 2000-03-17 | 2002-07-05 | Matsushita Electric Ind Co Ltd | Wireless communication device and wireless communication method |
| US9210708B1 (en) | 2000-12-15 | 2015-12-08 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US8934375B2 (en) | 2000-12-15 | 2015-01-13 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US8891414B2 (en) | 2000-12-15 | 2014-11-18 | Adaptix, Inc. | Multi-carrier communications with adaptive cluster configuration and switching |
| US8934445B2 (en) | 2000-12-15 | 2015-01-13 | Adaptix, Inc. | Multi-carrier communications with adaptive cluster configuration and switching |
| JP2005502218A (en) | 2000-12-15 | 2005-01-20 | ブロードストーム テレコミュニケイションズ インコーポレイテッド | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US8958386B2 (en) | 2000-12-15 | 2015-02-17 | Adaptix, Inc. | Multi-carrier communications with adaptive cluster configuration and switching |
| US8964719B2 (en) | 2000-12-15 | 2015-02-24 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US9344211B2 (en) | 2000-12-15 | 2016-05-17 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US9219572B2 (en) | 2000-12-15 | 2015-12-22 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| US9203553B1 (en) | 2000-12-15 | 2015-12-01 | Adaptix, Inc. | OFDMA with adaptive subcarrier-cluster configuration and selective loading |
| JP2012120213A (en)* | 2001-03-09 | 2012-06-21 | Adaptix Inc | Communication system using ofdm for one direction and dsss for another direction |
| JP2014064310A (en)* | 2001-03-09 | 2014-04-10 | Adaptix Inc | Communication system using ofdm in one direction and dsss in another |
| US8873516B2 (en) | 2001-03-09 | 2014-10-28 | Adaptix, Inc. | Communication system using OFDM for one direction and DSSS for another direction |
| JP2009081873A (en)* | 2001-05-17 | 2009-04-16 | Qualcomm Inc | Transmission in multi-channel communication system using selective channel power control |
| US8488706B2 (en) | 2001-05-17 | 2013-07-16 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
| US8477858B2 (en) | 2001-05-17 | 2013-07-02 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
| JP2009165126A (en)* | 2001-06-26 | 2009-07-23 | Qualcomm Inc | Method and apparatus for processing data for transmission in multi-channel communication system using selective channel transmission |
| JP2011139485A (en)* | 2001-06-26 | 2011-07-14 | Qualcomm Inc | Method and system for processing data for transmission in multi-channel communication system using selective channel transmission |
| JP2011182417A (en)* | 2001-06-26 | 2011-09-15 | Qualcomm Inc | Method and system for processing data for transmission in multi-channel communication system using selective channel transmission |
| WO2003085867A1 (en)* | 2002-04-08 | 2003-10-16 | Sharp Kabushiki Kaisha | Radio communication system |
| KR100689992B1 (en)* | 2002-04-08 | 2007-03-09 | 샤프 가부시키가이샤 | Wireless communication system |
| US7359341B2 (en) | 2002-04-08 | 2008-04-15 | Sharp Kabushiki Kaisha | Radio communication system |
| WO2004021617A1 (en)* | 2002-08-28 | 2004-03-11 | Matsushita Electric Industrial Co., Ltd. | Communication apparatus and communication method |
| US7697624B2 (en) | 2002-08-28 | 2010-04-13 | Panasonic Corporation | Communication apparatus and communication method utilizing multiple carrier waves for overcoming interference |
| US8032144B2 (en) | 2003-07-03 | 2011-10-04 | Panasonic Corporation | Multi-carrier communication device and feedback information communication method |
| US8369861B2 (en) | 2003-07-03 | 2013-02-05 | Panasonic Corporation | Base station and mobile station communicating with OFDM system using a plurality of subcarriers and communication method with OFDM system using a plurality of subcarriers |
| WO2005004362A1 (en)* | 2003-07-03 | 2005-01-13 | Matsushita Electric Industrial Co., Ltd. | Multi-carrier communication device and feedback information communication method |
| US8170571B2 (en) | 2003-07-03 | 2012-05-01 | Panasonic Corporation | Base station and mobile station communicating with OFDM system using a plurality of subcarriers and communication method with OFDM system using a plurality of subcarriers |
| WO2006035841A1 (en)* | 2004-09-29 | 2006-04-06 | Matsushita Electric Industrial Co., Ltd. | Transmitting apparatus, receiving apparatus, communication system and communication method |
| KR100698628B1 (en) | 2004-10-27 | 2007-03-21 | 임재성 | Spreading method and transmission apparatus of orthogonal frequency division multiple access system, orthogonal frequency division multiple access method |
| US7822132B2 (en) | 2004-11-02 | 2010-10-26 | Nec Corporation | OFDM communication system |
| KR100828478B1 (en) | 2005-11-28 | 2008-05-13 | 삼성전자주식회사 | Low complexity dynamic channel allocator and method in multi-carrier communication system |
| JP4878626B2 (en)* | 2006-07-10 | 2012-02-15 | 国立大学法人大阪大学 | Transmission method, transmission system, and receiver |
| WO2008007506A1 (en)* | 2006-07-10 | 2008-01-17 | Osaka University | Transfer method, transfer system, transmitter apparatus and receiver apparatus |
| JP2008048288A (en)* | 2006-08-18 | 2008-02-28 | Sony Corp | Radio communication system and radio communication device |
| JP2009159633A (en)* | 2009-04-13 | 2009-07-16 | Fujitsu Ltd | Multi-carrier direct spread transmitter / receiver system, multi-carrier direct spread transmitter / receiver, multi-carrier direct spread transmitter and multi-carrier direct spread receiver, multi-carrier transmit / receive system, multi-carrier transmitter / receiver, multi-carrier transmitter and multi-carrier receiver |
| JP2009260980A (en)* | 2009-06-12 | 2009-11-05 | Panasonic Corp | Base station device and transmission method |
| Publication number | Publication date |
|---|---|
| JP3035512B2 (en) | 2000-04-24 |
| Publication | Publication Date | Title |
|---|---|---|
| JP3035512B2 (en) | Multicarrier signal transmission method and apparatus | |
| EP2148483B1 (en) | OFDM system with subcarrier group phase rotation | |
| US8396165B2 (en) | Multicarrier-signal receiving apparatus and multicarrier-signal transmitting apparatus | |
| KR100918764B1 (en) | Preamble Sequence Transceiver and Method in Orthogonal Frequency Division Multiplexing Communication System Using Multiple Transmit Antennas | |
| EP1657872A2 (en) | Apparatus and method for transmitting a preamble and searching a cell in an OFDMA system | |
| WO1999063691A1 (en) | Ofdma signal transmitting apparatus and method | |
| CN101188597A (en) | Scattered pilot pattern and channel estimation method for MIMO-OFDM system | |
| KR20060090623A (en) | Distributed Multi-antenna Scheduling for Wireless Packet Data Communication Systems Using OPDM | |
| CN205864457U (en) | A kind of frequency diversity underwater sound communication modem | |
| WO2007148584A1 (en) | Device and method for performing communication in a variable band | |
| KR20060104561A (en) | Antenna Selection Diversity Apparatus and Method in a Broadband Wireless Communication System | |
| JP2962299B2 (en) | Multi-carrier signal transmission device | |
| CN115913420B (en) | SNR estimation method and device based on SRS in 5G small base station system | |
| KR100787179B1 (en) | Cell searching device and method in wireless communication system | |
| JP4830613B2 (en) | Multi-user communication system, communication apparatus, and multipath transmission path estimation method using them | |
| JP2009147897A (en) | Device and method for calculating channel state information | |
| CN101287146A (en) | Pilot Transmitting and Receiving Method and Equipment in Dedicated Carrier | |
| CN1983860A (en) | Method and apparatus for transmitting synchronous signal | |
| KR101547284B1 (en) | Transmitting apparatus and method using space-frequency transmit diversity | |
| JP2002261727A (en) | OFDM signal transmission equipment | |
| KR20050011292A (en) | Apparatus for generating preamble sequences in an orthogonal frequency division multiplexing communication system using a plurarity of transmission antennas and method thereof | |
| JP3329322B2 (en) | Multi-carrier transmission equipment | |
| CN100544339C (en) | A digital TV broadcast modulation method and device | |
| JP2023130882A (en) | Wireless installation for non-orthogonal multiple access | |
| WO2008047556A1 (en) | Mobile communication system and mobile wireless terminal apparatus |
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) | Free format text:PAYMENT UNTIL: 20080218 Year of fee payment:8 | |
| FPAY | Renewal fee payment (event date is renewal date of database) | Free format text:PAYMENT UNTIL: 20090218 Year of fee payment:9 | |
| LAPS | Cancellation because of no payment of annual fees |