TW589818B - Method of transmit diversity using TDD wideband multi-carrier DS-CDMA system - Google Patents

Abstract

A method of transmit diversity using TDD wideband multi-carrier DS-CDMA system comprise using frequency domain and spacing domain for shooting signal to achieve high-speed-down-chain parallel transferring; channel gain using up-chain receiving on TDD, therefore, the invention showing down-chain sending by beforehand of frequency domain and spacing domain to achieve high capacity and speed; using many an orthogonal frequency generator for per carrier wave to transfer channel signal with IFFT and protecting channel processor, therefore, the invention to achieve high speed wide-band parallel data transferring for carrier waves; and collecting gain by many an antennas for receiver using FFT and frequency wave filter, therefore, the invention provides a shooting collecting gain.

Description

Translated fromChinese

589818 五、發明說明（1) 【發明領域】 本發明有關一種用於分時雙工寬頻多載波直接序列 分碼多重進接系統之發射分送方法，適用以VLSI製造， 符合單晶片系統（System on Chip, SOC)的設計理念， 更進而符合未來接收機『輕薄短小』的設計。 【相關技術說明】 在展頻通訊中，傳統之發射分集技術可分為下列方 法。首先，習用之發射分集技術，係以一種利用空時區 塊編碼（Space-Time Block Coding)方法達成發射分集 的目的，如 S· Μ· Alamouti and V. Tarokh於 丨1 Transmitter diversity technique for wireless communications" U. S· Patent 6,1 85,2 58 與，’A simple transmitter diversity scheme for wireless communications，” IEEE J. Select. Areas Commun.， vol· 16， pp· 1451-1458， Oct. 1998 中所述為例。該 文所述之用戶台接收機是適用於單一路徑衰減通道環境 下，可獲得發射分集增益。雖然該文所述之用戶台可獲 得發射分集增益，但其接收機僅能適用於單一路徑衰減 通道而不適用於多重路徑衰減通道。 其他用於多重路徑衰減通道之發射分集方法亦已被提出 ，如 A. J. Paulraj，et a 1.丨丨 Wireless communication system and method using stochastic space-time/frequency division multiplexing" U.589818 V. Description of the invention (1) [Field of the invention] The present invention relates to a transmission and distribution method for a time-division duplex wideband multi-carrier direct-sequence code division multiple access system, which is suitable for manufacturing with VLSI and conforms to a single-chip system. on Chip, SOC) design concept, which further conforms to the future design of "thin, light and short" receivers. [Related technology description] In spread spectrum communication, the traditional transmit diversity technology can be divided into the following methods. First, the conventional transmit diversity technology uses a space-time block coding method to achieve the purpose of transmit diversity, such as S · M · Alamouti and V. Tarokh in 1 Transmitter diversity technique for wireless communications " U.S. Patent 6, 1 85, 2 58 and, 'A simple transmitter diversity scheme for wireless communications,' IEEE J. Select. Areas Commun., Vol. 16, pp. 1451-1458, Oct. 1998 For example, the user station receiver described in this article is suitable for a single path attenuation channel environment to obtain transmit diversity gain. Although the user station described in this article can obtain transmit diversity gain, its receiver can only be used in A single path attenuation channel is not suitable for multiple path attenuation channels. Other transmit diversity methods for multiple path attenuation channels have also been proposed, such as AJ Paulraj, et a 1. 丨 Wireless communication system and method using stochastic space-time / frequency division multiplexing " U.

589818 五、發明說明（2) S. Patent 6，377，632 與 R· Esmailzadeh, E· Sourour ,and M. Nakagawa, "Pre-RAKE diversity combining in time division duplex CDMA mobile communications, 11 IEEE Trans. On Vehicular Technology, vol· 48， pp· 795-801， May 1999。其中 Pre-RAKE方法，該文所述之用戶台接收機是適用於單一 用戶與多重路徑衰減通道之環境下，可獲得發射分集增 益。雖然該文所述之用戶台可獲得發射分集增益，但其 接收機僅能適用於單一用戶環境，而沒辦法對付多用戶 多路徑干擾之環境。 最後，用於多重路徑衰減通道與多用戶傳輸之發射 分集方法亦已被提出，如B· R. Vojcic and W. M.589818 V. Description of the invention (2) S. Patent 6,377,632 and R. Esmailzadeh, E. Sourour, and M. Nakagawa, " Pre-RAKE diversity combining in time division duplex CDMA mobile communications, 11 IEEE Trans. On Vehicular Technology, vol. 48, pp. 795-801, May 1999. Among them, the Pre-RAKE method, the user station receiver described in this article is suitable for a single user and multiple path attenuation channel environment, and can obtain transmit diversity gain. Although the user station described in this article can obtain transmit diversity gain, its receiver can only be used in a single user environment, and cannot deal with the environment of multi-user multi-path interference. Finally, transmit diversity methods for multipath attenuation channels and multi-user transmission have also been proposed, such as B.R. Vojcic and W.M.

Jang, n Transmitter precoding in synchronous multiuser communications，丨’IEEE Trans. OnJang, n Transmitter precoding in synchronous multiuser communications, 丨 IEEE Trans. On

Communications, vol· 46，pp· 1 346- 1 355，Oct· 1998 中所述為例。該方法是利用時域上之信號處理技術達成 消除多用戶與多路徑干擾，也就是說，該方法是運用複 雜之反矩陣運算，來達成用戶台獲得發射分集增益，但 是其方法需要反矩陣運算計算量非常大，因而會使處理 流程變得複雜，並且以VLSI的技術來實現是相當困難的 〇 0 【本發明之概述】 本發明之主要目的，在提供一種以低複雜的運算量Examples are described in Communications, vol. 46, pp. 1 346-1 355, Oct. 1998. This method uses signal processing techniques in the time domain to eliminate multi-user and multi-path interference. That is, the method uses complex inverse matrix operations to achieve the user station to obtain transmit diversity gain, but its method requires inverse matrix operations. The amount of calculation is very large, so the processing flow is complicated, and it is quite difficult to implement with VLSI technology. [Summary of the invention] The main purpose of the present invention is to provide a low-complexity calculation.

589818 五、發明說明（4) _ 時該訊號被傳 出N個資料要平：串列轉並列之轉換器1 0，同時產生 載波與J個天線，订傳送。此時該訊號同時被分配於Μ個 到相同的訊號來^，如圖一所示，並且每個天線皆分配 為尤=七y ( Pll2傳送。因此，該訊號尤可描述成一般式 時被分配到Ρ個Γ·/與心1，2，.·.，）。其中每個載波可以同 冪次方值）。牿巩，要傳送，P二N / M (N與^1皆為2的 是彼此正交不會兒明，M個載波中每個載波的中心頻域 個載波的收於登，如圖二之頻譜分布顯示之，並且Μ 配之後，該藉由1FFT / fft來完成之。在資料分 先處理器1丨$ 嘗在每一個載波上被傳送至通道預 益‘相乘而產;,里;n : : f 〃广域上之通道增 。因為在分睡雔㈤)〜，· 7，w，八中 為取共軛複數之運算 以藉由上鏈接=的系統中’頻域上之通道增益^可. 枷=丨，2，··.敗通、首Ϊ獲得’並且每個天線；=1，2，...，禮每個栽 時有"保1 r 曰盈皆不相同。特別說明，其中因上鏈 因此日士试 1處理器”15 (Guard Interval )的設計， 通道：二路徑效應’將會在頻域上成為平垣式 μ ,,、 令：去專化器複雜計算的優點，除此之外， =iI鍵接收器電路，更進而將用戶台犁耙式處理器放 ;土地台處理之，它就是通道預先處理器1 i。 ，道預先處理之後，該訊號會在每一 波上破傳运至展頻碼產生器丨2。該展頻碼產生器栽 訊號與展頻碼〜相乘而產生、“吒，其中二將 個載波上之第P個訊號區間中，會有hU·，尺等κ個碼相m 589818 五、發明說明（5) 之。特別說明，為了讓同一載波可以同時傳送p個訊號 ’並且不造成干擾而達到高速下鏈的能力，係利用p個 不相同而且正交的产頻碼产丨，2，·、，。，如Hadamard_589818 V. Description of the invention (4) _ When the signal is transmitted, N pieces of data must be flat: a serial-to-parallel converter 10, and a carrier and J antennas are generated at the same time, and transmission is ordered. At this time, the signal is allocated to M to the same signal ^ at the same time, as shown in Figure 1, and each antenna is assigned to You = seven y (Pll2 transmission. Therefore, this signal can be described as a general formula Assigned to P Γ · / and hearts 1, 2,,...,). Each of these carriers can be of the same power).牿 Gong, to transmit, P 2 N / M (N and ^ 1 are 2 are orthogonal to each other will not be clear, the center frequency domain of each carrier among M carriers is received, as shown in Figure 2 The spectrum distribution is shown, and after M is allocated, it should be completed by 1FFT / fft. In the data pre-processing processor 1 丨 try to be transmitted on each carrier to the channel pre-benefit and multiply; ; n:: f 通道 The channel in the wide area is increased. Because in the sub-sleep 雔 ㈤) ~, · 7, w, the eighth is the operation of taking the conjugate complex number to use the system in the frequency link = Channel gain ^ may. 枷 = 丨, 2, ·· .Failed, first obtained 'and each antenna; = 1,2, ..., every time there is " guarantee 1 r the same. In particular, among them, the design of the Japanese Intellectual Test 1 processor "15 (Guard Interval) due to the on-chain, the channel: the two-path effect will become a flat μ in the frequency domain. In addition to the advantages, the = iI key receiver circuit further puts the user's platform rake processor; the ground platform processes it, which is the channel pre-processor 1 i. After the channel is pre-processed, the signal will be On each wave, it is transmitted to the spread-spectrum code generator. 2. The spread-spectrum code generator multiplies the signal with the spread-spectrum code and generates "吒", two of which are the P-th signal interval on the carrier. There will be hU ·, ruler and other κ code phases m 589818 V. Description of invention (5). In particular, in order to allow the same carrier to simultaneously transmit p signals ′ without causing interference and achieve high-speed downlink capability, p different, orthogonal production frequency codes are used to produce 1,2, ...,. Like Hadamard_

Walsh code，其中在展頻 碼，生器1 2之後/計算該訊號心oH •心〜在同一載波中 之’心和’其έ己為為達成多'戶同時下鍵的 二的，此時，在=同—載波上，將該訊號|心一 .W彳與其 匕=戶，之訊號相加產生出訊號〜。而該P訊號〜U = i，2，".，a/) 被、φ ί至f快速傅利葉轉換器13，計算出M點該、之反 1、，、利葉轉換並且該訊號被傳送至並列轉串列轉換器 ^被傳而ί出串列矾號以符號气表示之。此外，該訊號 將咳訊^ if區間處理器15 ’此保護區間處理器15是 該訊號ΐ之個訊號之尾部乂個訊號迴旋複製到 説明，保護區；〆：二所不，進而產生訊號。。特別 會達成在頻率上通道中的多路徑區間，如此將 耀訊號經升頻式通道路徑之優點。接著，該基 射出去’此日=升頻為IF/RF訊號再經由第j個天線發 π.通道^個天線同時發射。 基地台每個1綠 端時會有不同^，Ϊ發射訊號經由環境的影響到達接收 ，因為在分時雔工盘 徑與片1，2，…，*7個天線。特別說明 上鏈與下鏈傳二ρ =用戶台緩慢移動的通訊系統十，在 連傳輸境境下，時域上的多路徑衰減值α"是相Walsh code, where after the spreading code, the generator 1 2 / calculate the signal heart oH • heart ~ 'Hehe' in the same carrier is the two of the keys that are simultaneously keyed to achieve multiple 'households, at this time On the same carrier, add the signal | Xinyi.W 彳 and its signal to the household to generate a signal ~. And the P signal ~ U = i, 2, "., A /) is converted from φ ί to f fast Fourier converter 13 to calculate M points, and vice versa 1,, and the Fourier converter and the signal is transmitted To the parallel-to-serial converter ^ was passed and the serial number was represented by the symbol gas. In addition, the signal will be copied ^ if interval processor 15 ′ This protected interval processor 15 is the tail of the signal, and a signal is copied to the description and protected area; 〆: the second place does not generate a signal. . In particular, a multipath interval in the channel in frequency will be achieved, which will illuminate the advantages of the signal through the upconverting channel path. Then, the base is out 'this day = the frequency is up-converted to IF / RF signal and then transmitted via the jth antenna and π. Channel ^ antennas at the same time. The base station will be different at each green end ^. The emission signal of the base station reaches the receiver through the influence of the environment, because in the time-sharing operation, the disk diameter is equal to that of the chip 1, 2, ..., * 7 antennas. Special note: On-chain and down-chain transmission 2 ρ = Communication system where the user station moves slowly. In the context of continuous transmission, the multipath attenuation value α in the time domain is the same.

$ 9頁 589818 五、發明說明（6) 同的。因為在用戶台接收機處理訊 執：合？：知在保護區間去除後，頻：上 列方程式來表ΐ农減m ，也就是說，該訊號以下 hjy-hjM^FFT^ajx α；2...α 〇...〇])$ 9 pages 589818 V. Description of Invention (6) Same. Because the receiver processes the signal at the subscriber station: OK? : Knowing that after the guard interval is removed, the frequency: The above equation is used to express the farmers' reduction m, that is, the signal below hjy-hjM ^ FFT ^ ajx α; 2 ... α 〇 ... 〇])

HI.接收機部分 ， U 在本::明MC Ds —_Α下鏈架構之接收機部 不：天線接收進入之射頻（R F / I F ) $ ^ % 4 器21產生出訊號-(請參第五圖）。又，：=:去除 :列轉並列轉換器22產生出_平行輸又出的 且該M個訊號、被傳送至快 π::;出Mrr之快速傅利葉轉換並且丄= κ=載波上被傳送至展頻碼匹配濾波，。/ i m ‘ μ f δί1號h與展頻碼Cp,*相乘而產生凡·&，兑中 1Ϊ，因：：說明’因為同一載波中有ρ個展頻碼同時 處理該訊有… 期中之總和，苴記Α今β π攻汛唬几。在一展頻..碼週 豆他P-ι個沾W ，如此即可去除平行傳輸之 個訊號：輪出 产1，2,…，Ρ。特別4:丨明二话丨」J ，其中饥=1，2，.、从與 ° ’该輸出訊號中會有分集增益 /Ul p 1_ 111 ~1 瞧___ 1111 1 圓_國國1 第10頁 589818 五、發明說明（7) 办J ’其係因在發射端設計有通道預先處理技術，如 二匕=欠端即可.經由报簡單的展頻碼匹配滤波器 分集增益，而不需要接收端的举耙式處理器，2 省用戶台接收機的電路，該分t p 訊號的訊雜比品質，因此亥；於提昇接收 ^ c』以具有如改變調變模式、 用台省電與基地台涵蓋面積擴大等彈性系統運用之優 系σ 號έ::並定？從展:Τ广慮波器24接收到訊 該s策器25會決， 仏η，*立丄υ 一 6凡^之貝部疋否為大於或小 並產生出一實驗判f j otsK二广、/繁:9:::疋《π ’如严該訊號之調變為 QPSK，该決束益25會分別決定該訊號^乂之 部是否為大於或小於〇，並產生出一^驗判定彳―。业 該QPSK之實例中，所產生之實 (p-')M+m在 訊號。接著，如圖四所*，該：為-個複數 列轉串列轉換器％中，產生出欲二$ 曰被傳送至並 本發明之實驗數據’主要是驗證發明方m:。 首先’利用電腦模擬軟體Matlab來驗證之。建 立模擬環境時，假設每個天線會有二根二在建 有路徑皆為瑞雷衰減(Rayleigh f 二： 統以“_bps速率傳輸，分為4個天線(j =二且= 個Λ頻碼產生器（p=4)同時傳送資料，立中 IFFT/FFT之長度為16，並且保護區間長度 討-^HI. Receiver part, U in this :: Ming MC Ds —_Α The receiver part of the downlink architecture does not: the antenna receives the incoming radio frequency (RF / IF) $ ^% 4 The device 21 generates a signal-(please refer to the fifth Figure). In addition,: =: remove: the parallel-to-parallel converter 22 generates _parallel output and output and the M signals are transmitted to the fast π :: ;; out of Mrr fast Fourier transform and 丄 = κ = is transmitted on the carrier To spread spectrum code matching filtering. / im 'μ f δί No. 1 h is multiplied with the spreading code Cp, * to generate Fan &, which equals 1Ϊ, because :: Explanation' Because there are ρ spreading codes in the same carrier, and the message is processed simultaneously ... In total, I remember Α this day β π attack flood bluff. In the first display frequency .. Code week Doudou P-ι dip W, so you can remove the signals of parallel transmission: wheel production 1, 2, ..., P. Special 4: 丨 two words 丨 "J, where hunger = 1, 2, ..., there will be a diversity gain in the output signal / Ul p 1_ 111 ~ 1 see ___ 1111 1 round _ country 1 10 Page 589818 V. Description of the invention (7) Office J 'It is because the channel pre-processing technology is designed at the transmitting end, such as two daggers = under-end. It is possible to match the diversity gain of the filter through a simple spread-spectrum code without receiving. High-end processor, 2 circuits of the user station receiver, and the signal-to-noise ratio quality of the tp signal, so it can improve the reception ^ c ”to have such functions as changing the modulation mode, saving power and the base station. What is the best σ number for the use of elastic systems such as area expansion? From the exhibition: the T wave filter 24 receives the signal, and the s policy 25 will decide whether 仏 η, * 立 丄 υ 6 6 之 的 部 部 is greater than or small and produces an experimental judgment fj otsK Erguang 、 / 繁: 9 ::: 疋 《π 'If the tone of the signal is changed to QPSK, the decision 25 will determine whether the part of the signal ^ 乂 is greater than or less than 0, and a ^ judgment is made.彳 ―. In this QPSK example, the resulting real (p-') M + m is in the signal. Then, as shown in Figure 4 *, this: is a complex serial-to-serial converter%, and the generated data is transmitted to and merged. The experimental data of the present invention is mainly to verify the inventor m :. First of all, use computer simulation software Matlab to verify it. When establishing the simulation environment, it is assumed that there will be two antennas for each antenna. The two paths under construction are all Rayleigh attenuation (Rayleigh f two: they are transmitted at the rate of "_bps" and are divided into four antennas (j = two and = Λ frequency codes). The generator (p = 4) transmits data at the same time. The length of the intermediate IFFT / FFT is 16 and the length of the guard interval is-^

接收端每個載波只需要4個展頻碼匹配器與決。策器’，JThe receiver only needs 4 spread-spectrum code matchers for each carrier. Strategy ', J

$ 11頁 589818 五、發明說明（8) 可將原始高速傳輸之4· 0 96Mbps資料偵測出來。然而， 從模擬結果圖六可知，探討天線數目增加時，對錯誤率 (BER)有明顯地下降，也就是說，用戶台接收機獲得發 射分集=增益，進而使接收品質提昇。並且，由實驗可 得知，f 一天線時可驗證得實驗結果數據與理論公式（ 夺ί ί推异的結果相符合。最後，由模擬結果得知 得發射分；=於多路徑衰減的環境’並且接收機可獲 。 集的效能，並且可檢測出高速、高品質的資料 以限工Γ月：實施例揭露如上，然其並非用 精神和範圍β，A =習此技藝者，在不脫離本發明之 當梘後附之申請；；2動與润飾，本發明之保護範圍 :埋模式ίΐί 一個使用者所使用，但= 之較佳實施:用檢測。因 ”口乾圍内對本發明加以改變。脫離本發$ 11 pages 589818 V. Description of the invention (8) It can detect the 4.0 96Mbps data of the original high-speed transmission. However, it can be seen from Figure 6 of the simulation results that when the number of antennas is increased, the error rate (BER) is significantly reduced, that is, the user station receiver receives transmit diversity = gain, which improves the reception quality. Moreover, it can be known from the experiment that the experimental data obtained when f is an antenna is in agreement with the theoretical formula (the result of the difference). Finally, the emission point is obtained from the simulation result; = in the environment of multipath attenuation 'And the receiver can obtain. Set the efficiency, and can detect high-speed, high-quality data to limit the work Γ month: the embodiment is disclosed as above, but it is not the spirit and range β, A = the person who is learning this skill, Departure from the application attached to the present invention; 2 actions and retouching, the scope of protection of the present invention: buried mode ίΐί is used by a user, but = the best implementation: use detection. Inventions to change.

第12頁 589818 圖式簡單說明 【圖式之簡單說明】 第一圖係為係為本發明之基地仏發射機之架構示意圖。 第二圖係為係為本發明之Μ個載波頻譜分布圖。 第三圖係為本發明保護區間處理器複製訊號之示意圖。 第四圖係為本發明之用戶台接收器機構示意圖。 第五圖係為本發明之保護區間去除器去除訊號之示意圖 〇 第六圖係為本發明之模擬結果。 【圖號說明】 1 0、串列轉並列轉換器 11、通道預先處理器 1 2、展頻碼產生器 1 3、反快速傅利葉轉換器 1 4、並列轉串列轉換器 1 5、保護區間處理器 16、升頻器 2 0、降頻器 2 1、保護區間去除器 2 2、串列轉並列轉換器 23、快速傅利葉轉換器 2 4、展頻碼匹配慮波為 25、決策器 2 6、並列轉串列轉換器Page 12 589818 Brief description of the drawings [Simplified description of the drawings] The first diagram is a schematic diagram of the base / transmitter architecture of the present invention. The second figure is a spectrum distribution diagram of M carriers according to the present invention. The third figure is a schematic diagram of the replication signal of the protection interval processor of the present invention. The fourth figure is a schematic diagram of the receiver station mechanism of the present invention. The fifth diagram is a schematic diagram of removing signals by the guard interval remover of the present invention. The sixth diagram is the simulation result of the present invention. [Illustration of drawing number] 1 0, serial-to-parallel converter 11, channel pre-processor 1 2, spread-spectrum code generator 1, 3, inverse fast Fourier converter 1, 4, parallel-to-serial converter 1, 5, protection interval Processor 16, up-converter 2 0, down-converter 2 1. guard interval remover 2 2. serial-to-parallel converter 23, fast Fourier converter 2 4. spread-spectrum code matching consideration 25, decision-maker 2 6.Parallel to serial converter

第13頁Page 13

Claims (1)

Translated fromChinese

種用於为雙工寬類 接系統之發射分送方法 戰波直接序列分 理器、展頻碼產生器/、，係包含空-頻通i 與保護區間處理器係反決速傅利葉轉換 換器（FFT)與展頻碼匹^使用戶台藉以快速 。 己濾波器之接收機艮I 接系統之發射分详 夕载波直接序列 在每個天線基地台發射 頻域上之通道預先處理J獲：之通道增 ; 处里15，進行預先補 =號栽h，運用多個展頻碼產生器同 建到下鏈的目的； 運用反快诘扁 、笑，甘曰逮傅利葉轉換器，達成多載波訊 敗此正交不重疊干擾； 不同天綠俵、、， ^ 、， ， 寻迗相同訊號，但不同天線具有 迢增盈，叙^ #個天線每個載波上同時進行通 理器之功能· f司 同時傳送多個訊號’並且不同載 同的訊號，、I Μ々β ^ 建到下鍵之目的。 一種用於分時雙工寬頻多載波直接序列分 f系統之發射分送方法，於用戶台接收端 ，個載波上具有不同的展頻匹配濾波器同 夕個。fl竣’每個訊號皆具有分集增益之能 竭多重進 Ϊ預先處 器（IFFT) 傅利葉轉 7可接收 碼多重進 係包含： ’運用於 通道増益 時傳送多 號平行傳 不同的通 道預先處 波傳送不 碼多重進 係包含： 時決策出 量； 589818 六、申請專利範圍 不同載波上，皆運用相同的多個展頻碼匹配濾波器 ，即可同時決策出不同於其它載波上之多個訊號； 所有載波上之所有同時存在的決東貪料5經由並列 轉串列轉換器達成資料輸出的目的。A method for transmitting and distributing a duplex wide-type connection system. Battle-wave direct sequence divider, spread-spectrum code generator /, including space-frequency communication i and protection interval processor. Inverse speed Fourier transform The FFT is matched with the spreading code, which enables the user station to be fast. The receiver of the filter is connected to the transmission system of the system. The direct carrier sequence in the transmit frequency domain of each antenna base station is pre-processed. J is obtained: the channel is increased; , Use multiple spread-spectrum code generators to build to the purpose of down-chain; use anti-fast, flat, laugh, Gan Yue catch Fourier converters, achieve multi-carrier signal defeat this orthogonal non-overlapping interference; different sky green ,,,, ^,,,, Find the same signal, but different antennas have the function of increasing gain, ^ ^ # antennas on each carrier at the same time as the function of the router · f company transmits multiple signals at the same time and different signals with the same load ,, I Μ々β ^ built to the purpose of the next key. A transmission and distribution method for a time-division duplex wideband multi-carrier direct-sequence f-system. At the receiving end of a user station, each carrier has different spread-spectrum matched filters. 'Fin' 'Each signal has diversity gain exhaustive multiple advance preprocessor (IFFT) Fourier to 7 receivable code multiple advance system includes:' Applies to channel benefits when transmitting multiple signals in parallel and transmitting different channels in advance The transmission of non-code multiple inputs includes: time-decision output; 589818 VI. The same multiple spread spectrum code matching filters are used on different carriers with different patent application scopes, and multiple signals different from other carriers can be determined at the same time; All the coexistence of Judedong 5 on all carriers achieve the purpose of data output through the parallel to serial converter.第15頁Page 15