JPH0697914A - Spread time diversity spectrum communication system - Google Patents

Spread time diversity spectrum communication system

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Publication number
JPH0697914A
JPH0697914A JP26920092A JP26920092A JPH0697914A JP H0697914 A JPH0697914 A JP H0697914A JP 26920092 A JP26920092 A JP 26920092A JP 26920092 A JP26920092 A JP 26920092A JP H0697914 A JPH0697914 A JP H0697914A
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JP
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Prior art keywords
delay
time
bit
information
system
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP26920092A
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Japanese (ja)
Inventor
Shuzo Kato
Shuji Kubota
周治 久保田
修三 加藤
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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Abstract

PURPOSE: To distribute an error in a small processing delay time and to improve a transmission characteristic by distributing an information bit to (n) system signals, giving each different delay thereto, thereafter, modulating, synthesizing and transmitting them, and executing same reverse processing in a reception side.
CONSTITUTION: An information bit is distributed to (n) system signals of two systems, etc., and a delay τ is imparted thereto through each different delay '0' and a delaying circuit 11. Thereafter, each information bit of two diffused and modulated, and modulated by diffusing circuit 2, and modulating circuit 3, respectively, and also, synthesized on a time base by a synthesizer and transmitted to a transmission line 5. In a reception side, after executing corresponding demodulation/reverse diffusion, etc., the delay time difference of an information bit train of each system is compensated, thereafter, it is synthesized or selected. By separating timewise this one information bit and distributing and transmitting it, an error is distributed in a small processing delay time, and a transmission characteristic in a burst error is improved.
COPYRIGHT: (C)1994,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明はスペクトル拡散通信方式に関する。 The present invention relates to a spread spectrum communication system.

【0002】 [0002]

【従来の技術】従来、移動通信・移動体衛星通信等でみられるフェージング・シャドウイング等の時変通信路にスペクトル拡散通信を用いる場合、時間的に集中して発生する誤り(バースト誤り)による劣化を軽減するためにブロックインターリーブが用いられてきた。 Conventionally, when using the spread spectrum communication in varying channel when fading shadowing, etc. found in the mobile communications and mobile satellite communications, etc., by the error (burst error) which occurs in a concentrated temporally block interleaving have been used in order to reduce the deterioration. また、情報ビットの変調には2値位相変調(BPSK)が用いられていた。 Further, the modulation of information bit binary phase modulation (BPSK) has been used.

【0003】しかし、従来のシリアルな情報列をシリアルな情報ビット列にブロックインターリーブする方法では、ブロックの情報全てを受信してからはじめて並べ替えを行い出力するので、バースト誤りを十分ランダム化するには大きな処理遅延時間を必要とした。 However, in the method for block interleaving conventional serial information sequence into a serial data bit stream, since the output is performed for the first time sorting after receiving all information blocks, to fully randomize burst errors a large processing delay time was required. また、インターリーブ方式は単なるビットの並べ替えであり、1つのビットに着目すると誤りの分散効果はなかった。 Further, the interleaving method is a sort of mere bit, there was no effect of dispersing errors when focusing on a single bit.

【0004】従来のスペクトル拡散通信方式の例を図6 [0004] The example of a conventional spread spectrum communication system 6
に示す。 To show. 送信される情報ビット列はブロックインターリーブ回路に入力され、ビットの並べ替えを施された上で既知の高速な拡散符号(例えばPN符号)にて拡散され、その結果が2相位相変調器へ入力され変調出力が送信される。 Information bit sequence to be transmitted is input to the block interleave circuit, spread by a known fast spreading codes (e.g., PN code) on which has been subjected to rearrangement of bits, is input the result to the 2-phase modulator modulated output is transmitted. 受信側も送信側に対応する機能により受信情報ビット列が再生される。 Receiving side receiving the information bit sequence is reproduced by the function corresponding to the transmitting side.

【0005】 [0005]

【発明が解決しようとする課題】本発明はフェージング・シャドウイング等の時変通信路にスペクトル拡散通信を用いる場合、小さな処理遅延時間でバースト誤りをランダム化するとともに、1つのビット毎の誤りを分散させることにより伝送特性の改善を図ることを目的とする。 [0008] The present invention in the case of using the spread spectrum communication in varying channel when such fading shadowing, with randomize burst errors with a small processing delay time, an error for each one bit It aims to improve the transmission characteristics by dispersing.

【0006】 [0006]

【課題を解決するための手段】本発明では、送信される情報ビットはn系統の信号に分割され、それぞれ異なる遅延(遅延時間0も含む)を与えられた後変調され送信される。 In the present invention SUMMARY OF], the information bits to be transmitted is divided into signals of n systems, and transmitted is modulated after being given a different delay, respectively (including delay time 0). また、受信側ではそれぞれの遅延時間を補正した後n系統に分かれた情報が合成または選択される。 The information on the receiving side, divided into n lines after correcting the respective delay times are synthesized or selected.

【0007】 [0007]

【作用】本発明における処理遅延時間は送信側で与えられた遅延時間のみとなるので、従来のブロックインターリーブに比べ少ない処理遅延時間が実現できる。 Since [action] processing delay time in the present invention is only the delay time given by the transmission side, a small processing delay time compared with the conventional block interleaving it can be realized.

【0008】また、本発明によれば1ビットの情報がn [0008] 1-bit information according to the present invention is n
系統に分かれて送信されることから、ビット単位での誤り分散効果がある。 From being sent divided into system, there is an error dispersion effect in bits.

【0009】 [0009]

【実施例】本発明の実施例について説明する。 EXAMPLES Examples of the present invention will be described. 図1はこの実施例のブロック図であって、n=2,m=2の場合を示している。 Figure 1 is a block diagram of this embodiment shows a case of n = 2, m = 2. 送信される情報ビット列は2系統に分割され、遅延回路によって時間差を与えられた後、高速符号系列(PN符号IおよびQ)で拡散され、4値位相変調されて送信される。 Information bit sequence to be transmitted is divided into two systems, after a given time difference by the delay circuit, is spread by a high speed code sequence (PN code I and Q), are transmitted are quaternary phase modulation. 図2は原情報ビット列と2系列に分割され時間差τを与えられた信号であり、例えば、τ Figure 2 is a signal given by the time difference tau divided into the original information bit sequence and two series, for example, tau
が10の場合IチャネルとQチャネルの時間差は10ビットとなり、Iチャネルの情報ビットがI 0のときはQ There time difference when I and Q channels of the 10 becomes 10 bits, when the information bits of the I channel is I 0 Q
チャネルはI 0 −τ=I -10 (10ビット前の情報ビット)となる。 Channel becomes I 0 -τ = I -10 (10 bits before the information bits). これらにより4値位相変調(直交変調)が行われる。 These by quaternary phase modulation (quadrature modulation) is performed. 受信側では送信側に対応する機能によって復調・逆拡散が行われ、遅延時間差が補正された後合成され受信情報ビット列が得られる。 On the receiving side is performed demodulate and despread by function corresponding to the transmitting side, the synthesized received information bit stream after the delay time difference is corrected is obtained. 復調は4値位相復調(直交復調)あるいは異なる独立したPN符号同期系と2値位相復調器の組み合わせのいずれでも可能である。 Demodulation can be any combination of quaternary phase demodulation (quadrature demodulation) or different independent PN code synchronization system and binary phase demodulator.

【0010】第2の実施例を図2により説明する。 [0010] The second embodiment will be described with reference to FIG. 図3 Figure 3
はこの実施例の送信部のブロック図であって、n=2, Is a block diagram of the transmitter of this embodiment, n = 2,
m=2の場合を示している。 It shows the case of m = 2. 送信される情報ビット列は2系統に分割され、遅延回路によって時間差を与えられた後、同一のパタンではあるが符号位相の異なる高速符号系列(PN符号IおよびIτcode)で拡散され、 Information bit sequence to be transmitted is divided into two systems, after a given time difference by the delay circuit, there is the same pattern but are spread with different high speed code sequence of code phase (PN code I and Aitaucode),
これによって4値位相変調された後送信される。 This is transmitted after being quaternary phase modulation. 受信側では送信側に対応する機能によって復調・逆拡散が行われ、遅延時間差が補正された後合成され受信情報ビット列が得られる。 On the receiving side is performed demodulate and despread by function corresponding to the transmitting side, the synthesized received information bit stream after the delay time difference is corrected is obtained. 復調は4値位相復調(直交復調)あるいは異なる独立したPN符号同期系と2値位相復調器の組み合わせのいずれでも可能である。 Demodulation can be any combination of quaternary phase demodulation (quadrature demodulation) or different independent PN code synchronization system and binary phase demodulator.

【0011】これらの実施例において送信側の拡散・変調の順序、受信側の復調・逆拡散の順序あるいはその両方の順序を入れ換えても得られる効果は全く同じである。 [0011] spreading and modulation on the transmitting side in these examples ordering, order or effect can be obtained by interchanging the order of both the demodulation and despreading on the receiving side is exactly the same.

【0012】第3の実施例を図5に示す。 [0012] shows a third embodiment in FIG. 本実施例では上記の実施例に加え、受信側に受信信号包絡線検波回路等からなる通信路変動周期検出器および遅延量情報生成回路と遅延量情報伝送回線を有し、時間ダイバーシチの遅延量がフェージングピッチ等の通信路劣化の周期と常に異なるように制御するものである。 In addition to the embodiments described above in this embodiment, and has a delay amount information transmission line channel fluctuation period detector and delay information generation circuit to the receiving side consisting of the received signal envelope detection circuit or the like, the delay amount of time diversity There is for always different control as the cycle of the communication path deteriorates the fading pitch and the like. このような構成とすることにより、時間ダイバーシチで送信される同一の情報ビットが同時に劣化することを避けることができ、 With such a configuration, it is possible to avoid that the same information bits to be transmitted in the time diversity is degraded at the same time,
よりダイバーシチ効果を高くできる。 More possible to increase the diversity effect.

【0013】 [0013]

【発明の効果】このような構成となっているので、1つの情報ビットが時間的に離れて送信され、ビット単位の誤り分散効果が少ない処理遅延時間で実現できる。 Effects of the Invention Since has such a configuration, one information bit is transmitted separated in time, can be realized by the error dispersion effect is small processing delay time of the bit units.

【0014】本発明の効果の一例として、レイリーフェージング条件(ドップラー周波数200,100,50 [0014] As an example of the effect of the present invention, Rayleigh fading condition (Doppler frequency 200, 100, 50
Hz)における符号誤り率特性を従来のブロックインタリーブのみの場合と本発明(n=2,m=2)のものを比較した結果(計算機シミュレーション)を図4に示す。 If the bit error rate characteristic in Hz) of the conventional block interleaving only and the present invention (n = 2, m = 2) result of comparing those (computer simulation) is shown in FIG. 情報ビット速度は10kbps、スペクトル拡散率は128、誤り訂正無し、復調方式は遅延検波方式として検討した。 Information bit rate 10 kbps, the spectral spreading factor 128, no error correction, demodulation method was examined as a delay detection system. 図より明らかなように、本発明により大きな改善効果(誤り率10 -2にて5−7dB)が得られることがわかる。 As is apparent from the figure, it can be seen that significant improvement by the present invention (5-7DB by the error rate 10-2) is obtained.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例(n=2,m=2)のブロック図である。 1 is a block diagram of an embodiment of the present invention (n = 2, m = 2).

【図2】本発明における情報ビット信号列を示す。 2 shows an information bit signal sequence in the present invention.

【図3】本発明の別の実施例(n=2,m=2)のブロック図である。 3 is a block diagram of another embodiment of the present invention (n = 2, m = 2).

【図4】本発明の効果を示す図である。 Figure 4 shows the effect of the present invention.

【図5】本発明の更に別の実施例のブロック図である。 5 is a block diagram of yet another embodiment of the present invention.

【図6】従来のブロックインターリーブを用いたスペクトル拡散通信方式のブロック図である。 6 is a block diagram of a spread spectrum communication system using a conventional block interleaving.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 ブロックインターリーブ回路 2 拡散回路 3 変調回路 4 搬送波 5 伝送路 6 復調回路 7 再生搬送波 8 逆拡散回路 9 ブロックデインターリーブ回路 11 遅延回路 12 遅延回路 13 合成回路 21 通信路変動周期検出器 22 遅延量情報生成回路 23 遅延量情報伝送回線 1 block interleave circuit 2 spreading circuit 3 modulator 4 carrier 5 transmission line 6 demodulating circuit 7 recovered carrier 8 despreading circuit 9 blocks deinterleave circuit 11 the delay circuit 12 a delay circuit 13 combining circuit 21 channel fluctuation period detector 22 delay amount information generating circuit 23 delay amount information transmission line

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 伝送する情報ビット列を該ビット列より高速な既知の符号列にて拡散変調を施し通信を行うスペクトル拡散通信方式において、 送信側では当該送信情報ビット列の1ビットをn系統(n 2;nは自然数)の情報ビットに分割し、 それぞれの情報ビット列に遅延素子により時間差を与えた後、上記、n系統(n=km;k,mは自然数)の情報ビット列をk組のmビット情報に分け、 これらに対する、高速な既知の符号列による拡散変調、 1. A spread spectrum communication system for performing communication performing spread modulation of information bit string to be transmitted in the bit string faster known code sequence, one bit n systems of the transmission information bit sequence on the transmission side (n> 2; n is divided into information bits a natural number), after giving a time difference by the delay elements in each of the information bit sequence, said, n lines (n = miles; k, m is an information bit sequence of natural numbers) of the k sets m divided into bit information, for these, the spread modulation by fast known code sequence,
    及び、k個の搬送波による2 m値変調(n≧m≧1)を行ない、 全ての変調波を合成して時系列信号として送信を行ない、 受信側では、送信側に対応する復調・逆拡散を行った後、n系統の情報ビット列の遅延時間差を遅延素子にて補償しその結果を合成または選択することを特徴とする時間ダイバーシチスペクトル拡散通信方式。 And, 2 m-level modulation by the k carrier performs (n ≧ m ≧ 1), performs transmission as a time series signal by combining all of the modulation wave, the receiving side, demodulation and despreading corresponding to the transmitting side after, to compensate for the delay time difference between the information bit sequence of n lines in the delay element time diversity spread spectrum communication system, characterized by combining or selecting the result.
  2. 【請求項2】 高速な既知の符号列がn個もうけられる請求項1記載の時間ダイバーシチスペクトル拡散通信方式。 2. A fast known time diversity spread spectrum communication system according to claim 1, wherein the code sequence has n also received.
  3. 【請求項3】 高速な既知の符号列が1個のみもうけられ、符号位相をかえて各系統に適用される請求項1記載の時間ダイバーシチスペクトル拡散通信方式。 3. A fast known code sequence is provided only one, time diversity spread spectrum communication system according to claim 1, wherein the applied changing the code phase in each system.
  4. 【請求項4】 通信路の変動周期情報を検出する手段を有し、通信路の変動周期情報に従って送受信機にてn系統の情報ビット列の遅延時間差が変動周期と一致しないように制御することを特徴とする請求項1記載の時間ダイバーシチスペクトル拡散通信方式。 4. have a means for detecting the variation period information of the communication path, that the delay time difference between the information bit sequence of n lines in the transceiver in accordance with the fluctuation period information of the communication path is controlled so as not to coincide with the variation period time diversity spread spectrum communication system according to claim 1, wherein.
JP26920092A 1992-09-14 1992-09-14 Spread time diversity spectrum communication system Pending JPH0697914A (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26920092A JPH0697914A (en) 1992-09-14 1992-09-14 Spread time diversity spectrum communication system

Publications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08191289A (en) * 1995-01-11 1996-07-23 Nec Corp Spread spectrum diversity transmitter-receiver
FR2732173A1 (en) * 1995-03-22 1996-09-27 Nec Corp Radio communication system for dispersed spectrum signals
EP0771084A1 (en) * 1995-10-23 1997-05-02 Nec Corporation Time diversity transmission-reception system
US7463608B2 (en) 1994-09-06 2008-12-09 Interdigital Technology Corporation Transmitting station for wireless telephone system with diversity transmission and method
US7697643B2 (en) 1995-01-04 2010-04-13 Interdigital Technology Corporation Setting a transmission power level for a mobile unit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7554964B2 (en) 1994-09-06 2009-06-30 Interdigital Technology Corporation Wireless telephone system with diversity transmission and method
US7463608B2 (en) 1994-09-06 2008-12-09 Interdigital Technology Corporation Transmitting station for wireless telephone system with diversity transmission and method
US7697643B2 (en) 1995-01-04 2010-04-13 Interdigital Technology Corporation Setting a transmission power level for a mobile unit
US7961822B2 (en) 1995-01-04 2011-06-14 Interdigital Technology Corporation Setting a transmission power level for a mobile unit
US8340228B2 (en) 1995-01-04 2012-12-25 Intel Corporation Setting a transmission power level for a mobile unit
US8824523B2 (en) 1995-01-04 2014-09-02 Intel Corporation Setting a transmission power level for a mobile unit
JPH08191289A (en) * 1995-01-11 1996-07-23 Nec Corp Spread spectrum diversity transmitter-receiver
FR2732173A1 (en) * 1995-03-22 1996-09-27 Nec Corp Radio communication system for dispersed spectrum signals
JPH08265236A (en) * 1995-03-22 1996-10-11 Nec Corp Diversity transmission and reception method and transmitter-receiver
EP0771084A1 (en) * 1995-10-23 1997-05-02 Nec Corporation Time diversity transmission-reception system
US5859870A (en) * 1995-10-23 1999-01-12 Nec Corporation Time diversity transmission-reception system

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