JPH09130299A - Spread spectrum signal reception equipment - Google Patents
Spread spectrum signal reception equipmentInfo
- Publication number
- JPH09130299A JPH09130299A JP7283329A JP28332995A JPH09130299A JP H09130299 A JPH09130299 A JP H09130299A JP 7283329 A JP7283329 A JP 7283329A JP 28332995 A JP28332995 A JP 28332995A JP H09130299 A JPH09130299 A JP H09130299A
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- Prior art keywords
- spread
- value
- spread spectrum
- maximum
- correlation value
- Prior art date
- 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.)
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- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、次世代の移動通信
方式として有力視されているスペクトラム拡散通信方式
（以下ＳＳ通信方式という）を用いた通信システムにお
いて、拡散符号の同期捕捉方式の１つであるスライディ
ング相関方式を用いたＳＳ信号受信装置に関する発明で
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread code synchronization acquisition system in a communication system using a spread spectrum communication system (hereinafter referred to as SS communication system), which is regarded as a promising next-generation mobile communication system. Is an invention relating to an SS signal receiving apparatus using the sliding correlation method.
【０００２】[0002]
【従来の技術】ＳＳ通信方式による通信の受信機におい
ては、受信入力信号は送信側で所定の拡散符号により拡
散された信号であり、受信機はこの拡散符号の位相を検
出し、同期捕捉を行わなければならない。2. Description of the Related Art In a receiver for communication by the SS communication system, a received input signal is a signal spread on a transmitting side by a predetermined spreading code, and the receiver detects the phase of this spreading code and acquires synchronization. It must be made.
【０００３】図９は従来例のスライディング相関器の構
成図である。図において、送信側でスペクトラム拡散に
用いたクロックと周波数が等しいクロックに基づいて拡
散符号発生器５で拡散符号を発生する。この拡散符号を
位相スライド回路４でクロック毎に一定位相（ＰＮ符号
の場合には１チップ）ずつずらせ、乗算器１で受信入力
信号との乗算を行うことにより逆拡散する。FIG. 9 is a block diagram of a conventional sliding correlator. In the figure, a spread code generator 5 generates a spread code based on a clock having the same frequency as the clock used for spread spectrum on the transmitting side. The spread code is despread by shifting the spread code by a fixed phase (one chip in the case of a PN code) for each clock by the phase slide circuit 4 and multiplying the received input signal by the multiplier 1.
【０００４】この乗算器１の出力を加算器２と加算値ラ
ッチ回路３とで拡散符号の一周期分について累積加算す
る。拡散符号の一周期分について累積加算を終わると、
最大相関値検出器７でこの値をそれまでの相関値の最大
値と比較しそれより大きい時のみ最大相関値として記憶
するとともに、一周期分の終了ごとに加算値ラッチ回路
３を分周器６の出力クロックによりリセットする。The output of the multiplier 1 is cumulatively added by the adder 2 and the addition value latch circuit 3 for one cycle of the spread code. When the cumulative addition is completed for one cycle of the spread code,
The maximum correlation value detector 7 compares this value with the maximum value of the correlation values up to that point, and stores it as the maximum correlation value only when it is larger than that value. Reset by the output clock of 6.
【０００５】この操作を位相スライド回路４により拡散
符号の位相を一定位相ずつずらせながら拡散符号の一周
期分の全位相にわたって行い、最大相関値検出器７で最
大の相関値を検出したとき、この最大相関値を相関値ラ
ッチ回路８から出力し、このときの位相を拡散符号の同
期位相として位相ラッチ回路９でラッチして出力する。This operation is performed over the entire phase of one cycle of the spread code by shifting the phase of the spread code by a constant phase by the phase slide circuit 4, and when the maximum correlation value detector 7 detects the maximum correlation value, The maximum correlation value is output from the correlation value latch circuit 8, and the phase at this time is latched and output by the phase latch circuit 9 as the synchronization phase of the spread code.
【０００６】図９は、受信入力信号が拡散符号のみの信
号（主信号データがすべて０又は１の場合の信号であ
り、パイロットチャネルを使用したＳＳ通信方式のパイ
ロットチャネルの信号は、このような拡散符号のみの信
号となる）の場合の構成図であり、上記位相情報を図示
しない回路により主信号受信データの逆拡散に使用す
る。FIG. 9 shows a signal in which a received input signal is only a spread code (a signal when main signal data is all 0 or 1 and a pilot channel signal of the SS communication system using a pilot channel is such a signal. FIG. 4 is a configuration diagram in the case of a signal of only a spread code), and the above phase information is used for despreading of main signal reception data by a circuit not shown.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら上述した
スライディング相関器の構成においては、同期をとる時
間が符号の位相の初期位置によりたまたま早かったり、
遅かったりすることがある。また、図８に示すように、
無線伝送路に瞬時変動（代表的な例として、レイリー変
動などのフェージング）がある場合に、スライディング
中たまたま同期位相の相関値を検出しているときに瞬時
変動により受信パワーレベルが落ち込んだ場合、相関値
の最大値を検出し位相同期の検出が行えるはずであった
のが、検出できないという問題があった。However, in the structure of the sliding correlator described above, the synchronization time happens to be faster depending on the initial position of the phase of the code.
It may be late. Also, as shown in FIG.
If there is an instantaneous fluctuation in the wireless transmission path (as a typical example, fading such as Rayleigh fluctuation), if the received power level drops due to the instantaneous fluctuation while accidentally detecting the correlation value of the synchronization phase during sliding, Although the maximum value of the correlation value could be detected to detect the phase synchronization, there was a problem that it could not be detected.
【０００８】本発明は上記問題点を解決するためになさ
れたもので、同期捕捉時間の短縮を図り、更に瞬時変動
による検出もれを防ぎ、正しい同期捕捉が行えるＳＳ信
号受信装置を提供することを目的とする。The present invention has been made in order to solve the above problems, and provides an SS signal receiving apparatus capable of shortening the synchronization acquisition time, preventing omission of detection due to instantaneous fluctuation, and performing correct synchronization acquisition. With the goal.
【０００９】[0009]
【課題を解決するための手段】上記問題点は以下の装置
の構成によって解決される。 （請求項１） 所定速度の拡散符号により拡散された信
号を受信するスペクトラム拡散信号受信装置であって、
該拡散符号と速度が等しい基本クロックを分周して出力
する分周手段と、該分周手段の出力クロックの速度で該
拡散符号を発生させる拡散符号発生手段と、受信したス
ペクトラム拡散信号を該拡散符号発生手段の出力により
逆拡散して出力する逆拡散手段と、該基本クロックの速
度で該拡散符号の一周期分に対応する数を所定の順序で
カウントし、該一周期分のカウントの終了ごとにカウン
トの開始値を１だけずらせた値から該開始値の直前の値
まで循環してカウントし、各カウント値を記憶手段のア
ドレスとして与えるアドレス算出手段と、該逆拡散手段
の出力を入力して、各アドレスごとに累積加算し、該加
算結果を各アドレスに記憶する記憶手段と、該記憶手段
の各アドレスの出力より相関値の最大値を求める最大相
関値検出手段とで構成する。The above problems can be solved by the following device configuration. (Claim 1) A spread spectrum signal receiving apparatus for receiving a signal spread by a spread code of a predetermined speed,
Dividing means for dividing and outputting a basic clock having the same speed as the spreading code, spreading code generating means for generating the spreading code at the speed of the output clock of the dividing means, and the received spread spectrum signal The despreading means for despreading and outputting by the output of the spreading code generating means, and the number corresponding to one cycle of the spreading code at the speed of the basic clock are counted in a predetermined order, and the count of the one cycle is counted. At each end, the count start value is shifted by 1 from the value immediately before the start value to count and the count value is circulated, and the output of the despreading means and the address calculation means for giving each count value as the address of the storage means are calculated. By inputting, cumulatively adding for each address, storing the addition result at each address, and maximum correlation value detecting means for obtaining the maximum correlation value from the output of each address of the storage means. It is formed.
【００１０】この結果、分周手段で分周したクロックの
一周期の間は拡散符号発生手段で発生させる拡散符号は
一定であり、この一定の拡散符号により受信したスペク
トラム拡散信号を逆拡散するため、フェージングによる
受信パワーの落ち込みの影響を、従来例のようにある特
定のタイミングですべて受けるのではなく、全体に平均
して受けることになり、同期未検出となる確率を大幅に
減らすことができる。As a result, the spread code generated by the spread code generating means is constant during one cycle of the clock divided by the frequency dividing means, and the spread spectrum signal received by the constant spread code is despread. , The influence of the received power drop due to fading is not received at all at a specific timing as in the conventional example, but is received as an average on the whole, and the probability that synchronization is not detected can be greatly reduced. .
【００１１】（請求項２） 請求項１に記載の最大相関
値検出手段で求めた相関値の最大値が所定のしきい値よ
り大きいとき、相関値判定手段で、同期捕捉がされたと
判定する。これにより、拡散符号の全周期にわたって相
関値の結果を得る必要がなくなるため、短時間に同期捕
捉を行うことができる。(Claim 2) When the maximum value of the correlation values obtained by the maximum correlation value detecting means according to claim 1 is larger than a predetermined threshold value, the correlation value determining means determines that the synchronization has been acquired. . By this means, it is not necessary to obtain the result of the correlation value over the entire period of the spread code, so that the synchronization acquisition can be performed in a short time.
【００１２】（請求項３） 請求項２に記載の相関値判
定手段における所定のしきい値は、受信したスペクトラ
ム拡散信号が伝送されてきた伝送路の情報により決定す
るようにする。この結果、安定した伝送路状態ではしき
い値を低く設定しておき、不安定な伝送路状態ではしき
い値を高く設定しておくことにより、同期捕捉の高速化
と誤同期の確率の低下を実現することができる。(Claim 3) The predetermined threshold value in the correlation value determining means according to claim 2 is determined by the information of the transmission path through which the received spread spectrum signal is transmitted. As a result, by setting the threshold value low in the stable transmission line state and setting the threshold value high in the unstable transmission line state, the speed of acquisition of synchronization and the probability of false synchronization are reduced. Can be realized.
【００１３】（請求項４） 請求項１に記載の相関値の
最大値が拡散符号の連続する周期において同一の位相で
検出された場合に、タイミング比較手段で、その位相で
同期捕捉がされたと判定する。この結果、ノイズ等によ
り相関値の最大値が誤検出された場合に、本請求項によ
る拡散符号の全周期について検出操作を行った後、２度
（あるいは３度）同様の検出操作を行うことにより、ノ
イズ等による場合は検出されなくなって真の最大相関値
を検出することができる。(Claim 4) When the maximum value of the correlation value according to claim 1 is detected in the same phase in consecutive cycles of the spread code, it is determined that the timing comparison means has acquired the synchronization in that phase. judge. As a result, when the maximum value of the correlation value is erroneously detected due to noise or the like, the same detection operation is performed twice (or three times) after performing the detection operation for all cycles of the spread code according to the present invention. As a result, the true maximum correlation value can be detected without being detected due to noise or the like.
【００１４】（請求項５） 請求項１に記載の最大相関
値検出手段の代わりに、前記記憶手段の出力より上位Ｎ
個の相関値を求める上位Ｎ個相関値検出手段を設ける。
この結果、マルチパス伝送路の環境下で複数の位相が存
在する場合に、マルチパス伝送路の主信号データの逆拡
散を行う際に上記Ｎ個の位相出力を位相情報として使用
し、上位Ｎ個の相関値出力を該主信号データの相関値の
大小に応じて重み付けを行う際に使用することができ
る。(Claim 5) Instead of the maximum correlation value detecting means according to claim 1, N higher than the output of the storing means.
An upper N correlation value detecting means for calculating the correlation values is provided.
As a result, when a plurality of phases exist in the environment of the multipath transmission line, the N phase outputs are used as phase information when despreading the main signal data of the multipath transmission line, and the upper N The individual correlation value outputs can be used when performing weighting according to the magnitude of the correlation value of the main signal data.
【００１５】（請求項６） 請求項５に記載の上位Ｎ個
の相関値の各位相がそれぞれ拡散符号の連続する周期に
おいて同一の位相で検出された場合に、タイミング比較
手段で、該各位相で同期捕捉がされたと判定する。この
結果、請求項４の場合と同じ効果を得ることができる。(Claim 6) When the respective phases of the upper N correlation values according to claim 5 are detected at the same phase in successive cycles of the spreading code, the timing comparing means detects the respective phases. Then, it is determined that the synchronization has been acquired. As a result, the same effect as the case of claim 4 can be obtained.
【００１６】[0016]
【発明の実施の形態】図１は本発明の第１の実施例のス
ペクトラム拡散信号受信装置の構成図であり、図２は本
実施例におけるアドレスカウンタの動作を説明する図で
ある。以下、図を用いて本実施例を詳細に説明する。1 is a block diagram of a spread spectrum signal receiving apparatus according to a first embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of an address counter in the present embodiment. Hereinafter, this embodiment will be described in detail with reference to the drawings.
【００１７】図１において、送信側でスペクトラム拡散
に使用したクロックと周波数が等しいクロックを、分周
器10で１／ＮPN（ここにＮPNは拡散符号の一周期分の符
号数）に分周して拡散符号発生器５に加え、図２の(2)
に示すように拡散符号の一周期間同じ符号（例えばＡ）
を出力する。尚、拡散符号の一周期は例えば、Ａ、Ｂ、
Ｃ、・・・、Ｚの26個よりなるものとする。In FIG. 1, a clock having the same frequency as the clock used for spread spectrum on the transmitting side is divided by a frequency divider 10 into 1 / N PN (where N PN is the number of codes for one period of spread code). In addition to the spread code generator 5 in FIG.
The same code (for example, A)
Is output. Incidentally, one cycle of the spread code is, for example, A, B,
It shall consist of 26 pieces of C, ..., Z.
【００１８】図２の(1) に示すような受信したスペクト
ラム拡散信号について、上記拡散符号発生器５の出力に
より乗算器１で逆拡散を行う。この乗算器１は、受信入
力信号が例えば“Ｈ”と“Ｌ”レベルからなるときは排
他的論理和回路（ＥＸ−ＯＲ）とインバータにより構成
され（いずれも図示しない）、受信入力信号が“１”と
“−１”のときは通常の乗算器を使用する。累積メモリ
12には本実施例の場合26個のアドレスを準備し、乗算器
１の出力を加算器２と累積メモリ12によりアドレスごと
に累積加算して、加算結果を累積メモリ12の各アドレス
に記憶する。The received spread spectrum signal as shown in (1) of FIG. 2 is despread by the multiplier 1 by the output of the spread code generator 5. This multiplier 1 is composed of an exclusive OR circuit (EX-OR) and an inverter (neither is shown) when the received input signal consists of "H" and "L" levels, and the received input signal is " When it is "1" and "-1", a normal multiplier is used. Cumulative memory
In the case of this embodiment, 26 addresses are prepared for 12 and the output of the multiplier 1 is cumulatively added for each address by the adder 2 and the cumulative memory 12, and the addition result is stored in each address of the cumulative memory 12. .
【００１９】上記累積メモリ12のアドレスの指定はアド
レスカウンタ11の出力により行われ、図２の(3) に示す
ように、アドレスカウンタ11で送信側でスペクトラム拡
散に使用したクロックと周波数が等しいクロックにより
変えていき、かつ、アドレスカウンタ11の出力カウント
値は拡散符号の一周期ごとに最小単位分（１チップ）ず
つオフセットをつけられて（ずらされて）おり、入力信
号の位相と累積メモリ12のアドレスが１対１に対応付け
られている。The address of the accumulating memory 12 is designated by the output of the address counter 11, and as shown in (3) of FIG. 2, a clock whose frequency is equal to that of the clock used for spread spectrum at the transmitting side of the address counter 11. The output count value of the address counter 11 is offset (shifted) by the minimum unit (1 chip) for each cycle of the spread code, and the phase of the input signal and the cumulative memory 12 are changed. Addresses are associated one-to-one.
【００２０】図２は、アドレス値の２番が同期捕捉のタ
イミングとなる例を示しており、アドレスが２の位置で
一つの周期の入力信号Ａと拡散符号発生器５の出力
（Ａ）が一致おり、次の周期の入力信号Ｂと拡散符号発
生器５の出力（Ｂ）が一致している。この操作を26個の
拡散符号（Ａ〜Ｚ）について行うことにより、アドレス
が２以外の値でも相関値は時間とともに若干増加するこ
とはあるが、アドレスが２の相関値は時間とともに確実
に増えていく。この様子を図２の(5) に示す。FIG. 2 shows an example in which the address value No. 2 is the timing of synchronization acquisition, and the input signal A of one cycle and the output (A) of the spreading code generator 5 at the position where the address is 2. They match, and the input signal B of the next cycle and the output (B) of the spread code generator 5 match. By performing this operation for 26 spread codes (A to Z), the correlation value may increase slightly with time even if the address is a value other than 2, but the correlation value with the address 2 certainly increases with time. To go. This is shown in Fig. 2 (5).
【００２１】最大相関値検出器７で相関値の最大値を検
出したとき同期捕捉がされたと判定し、累積メモリ12に
記憶された対応するアドレスのその時点での相関値を相
関値ラッチ回路８で保持し、その時点での位相を位相ラ
ッチ回路９で保持する。この位相情報をスペクトラム拡
散された受信主信号データの逆拡散に使用する。When the maximum correlation value detector 7 detects the maximum value of the correlation values, it is determined that the synchronization acquisition has been performed, and the correlation value at that time of the corresponding address stored in the cumulative memory 12 is determined by the correlation value latch circuit 8. The phase latch circuit 9 holds the phase at that time. This phase information is used for despreading the spread spectrum received main signal data.
【００２２】この結果、フェージングによる受信パワー
の落ち込みの影響を、従来例のようにある特定のタイミ
ングですべて受けるのではなく、全体に平均して受ける
ために、同期未検出となる確率を大幅に減らすことがで
きる。また、従来例では、同期をとる時間が符号の位相
の初期位置によりたまたま早かったり、遅かったりと不
定なのに対して、本方式においては一定した時間におい
て同期をとることができる。As a result, the influence of a drop in the received power due to fading is not averaged at a specific timing as in the conventional example, but is averaged over the whole, so that the probability of undetected synchronization is greatly increased. Can be reduced. Further, in the conventional example, the synchronization time is indefinitely early or late depending on the initial position of the phase of the code, but in the present system, the synchronization can be achieved at a constant time.
【００２３】図３は本発明の第２の実施例の装置の構成
図である。本実施例では、第１の実施例の構成（図１）
に相関値判定部13を付加し、相関値の最大値が予め設定
したしきい値を越えた時点で相関値ラッチ回路８及び位
相ラッチ回路９にセット信号を出力して、該時点の相関
値及び位相情報を出力するようにしたものである。これ
により、拡散符号発生器５の出力の拡散符号の全周期に
わたって相関値の結果を得る必要がなくなり、短時間に
同期捕捉のタイミングをとることができる。FIG. 3 is a block diagram of the apparatus of the second embodiment of the present invention. In this embodiment, the configuration of the first embodiment (FIG. 1)
A correlation value determination unit 13 is added to the correlation value determination unit 13 to output a set signal to the correlation value latch circuit 8 and the phase latch circuit 9 when the maximum correlation value exceeds a preset threshold value, And phase information is output. As a result, it is not necessary to obtain the result of the correlation value over the entire period of the spread code output from the spread code generator 5, and the timing of synchronization acquisition can be taken in a short time.
【００２４】図４は本発明の第３の実施例の装置の構成
図である。本実施例では、第２の実施例の構成（図３）
にしきい値設定部14を付加し、相関値判定部13のしきい
値を伝送路情報により可変できる構成としたものであ
る。FIG. 4 is a block diagram of an apparatus according to the third embodiment of the present invention. In this embodiment, the configuration of the second embodiment (FIG. 3)
A threshold value setting unit 14 is added to the above, and the threshold value of the correlation value determination unit 13 can be changed according to the transmission path information.
【００２５】伝送路情報としては、例えば移動局の静止
と移動の状態、移動速度やマルチパス伝送路の状態等を
モニターして、安定した伝送路状態（例えば、移動局が
静止していて、受信パワーの瞬時変動等が起こっていな
い時）では手動によりしきい値を低く設定しておき、不
安定な伝送路状態（例えば、移動局が移動しており、瞬
時変動が発生している時）ではしきい値を高く設定して
おくことにより、同期捕捉のタイミングの取得の高速化
と誤同期の確率の低下を実現することができる。As the transmission line information, for example, the stationary and moving states of the mobile station, the moving speed, the state of the multipath transmission line, etc. are monitored, and the stable transmission line state (for example, when the mobile station is stationary, If there are no instantaneous fluctuations in the received power, etc., manually set the threshold to a low value, and when the transmission line is unstable (for example, when the mobile station is moving and instantaneous fluctuations occur). In (), by setting a high threshold value, it is possible to speed up acquisition of the timing of synchronization acquisition and reduce the probability of false synchronization.
【００２６】図５は本発明の第４の実施例の装置の構成
図である。本実施例では、第１の実施例の構成（図１）
にタイミング比較器15を付加し、アドレスカウンタ11の
出力の一周期ごとに最大値検出を行い、タイミング比較
器15でこの位相を各周期毎に比較し連続して同じ位相に
最大相関値があった場合には、その位相で同期捕捉がさ
れたものとみなしてラッチパルスを出力し、相関値及び
位相情報を出力するようにしたものである。FIG. 5 is a block diagram of an apparatus according to the fourth embodiment of the present invention. In this embodiment, the configuration of the first embodiment (FIG. 1)
The timing comparator 15 is added to detect the maximum value for each cycle of the output of the address counter 11, and the timing comparator 15 compares this phase for each cycle. In this case, it is considered that the phase has been acquired synchronously, a latch pulse is output, and a correlation value and phase information are output.
【００２７】この結果、ノイズ等により最大相関値が誤
検出された場合に、本実施例により例えば図２の(4) に
示すような拡散符号のＡ〜Ｚまで検出操作を行った後、
２度（あるいは３度）Ａ〜Ｚの検出操作を行うと、ノイ
ズ等による場合は検出されなくなって真の最大相関値を
検出することができる。As a result, when the maximum correlation value is erroneously detected due to noise or the like, after performing the detection operation up to A to Z of the spreading code as shown in (4) of FIG.
When the detection operation is performed twice (or three times) A to Z, the true maximum correlation value can be detected because it is not detected due to noise or the like.
【００２８】図６は本発明の第５の実施例の装置の構成
図である。本実施例では、第１の実施例の構成（図１）
において、最大相関値検出器７の代わりに上位Ｎ個相関
値検出器16を設け、相関値ラッチ回路８及び位相ラッチ
回路９の代わりにそれぞれ、相関値ラッチ回路（＃１）
8-1 〜相関値ラッチ回路（＃Ｎ）8-N 及び位相ラッチ回
路（＃１）9-1 〜位相ラッチ回路（＃Ｎ）9-N を設け、
上位Ｎ個の相関値を順次検出するごとに＃１〜＃Ｎの相
関値及び位相情報を出力するようにしたものである。FIG. 6 is a block diagram of an apparatus according to the fifth embodiment of the present invention. In this embodiment, the configuration of the first embodiment (FIG. 1)
In the above, the upper N correlation value detectors 16 are provided instead of the maximum correlation value detector 7, and the correlation value latch circuits (# 1) are provided instead of the correlation value latch circuit 8 and the phase latch circuit 9, respectively.
8-1 to correlation value latch circuit (#N) 8-N and phase latch circuit (# 1) 9-1 to phase latch circuit (#N) 9-N
Each time the upper N correlation values are sequentially detected, the correlation values and phase information of # 1 to #N are output.
【００２９】この結果、マルチパス伝送路の環境下で複
数の位相が存在する場合に、上記＃１〜＃Ｎの位相出力
はマルチパス伝送路の主信号データの逆拡散を行う際に
位相情報として使用し、＃１〜＃Ｎの相関値出力は該主
信号データの相関値の大小に応じて重み付けを行う際に
使用することができる。As a result, when there are a plurality of phases under the environment of the multipath transmission line, the phase outputs of # 1 to #N are phase information when despreading the main signal data of the multipath transmission line. The correlation value outputs # 1 to #N can be used when weighting is performed according to the magnitude of the correlation value of the main signal data.
【００３０】図７は本発明の第６の実施例の装置の構成
図である。本実施例では、第５の実施例の構成（図６）
にタイミング比較器15' を付加することにより、前述し
た第4の実施例（図５）と同様の効果を得るようにした
ものである。FIG. 7 is a block diagram of an apparatus according to the sixth embodiment of the present invention. In this embodiment, the configuration of the fifth embodiment (FIG. 6)
A timing comparator 15 'is added to the above to obtain the same effect as that of the above-described fourth embodiment (FIG. 5).
【００３１】[0031]
【発明の効果】以上説明したように本発明によれば、瞬
時変動が起こっている伝送路を通ってきた信号の符号同
期捕捉において、未検出及び誤検出の確率を少なくし、
更に同期捕捉時間の短縮化を図ることができる。これに
より、直接拡散によるスペクトラム拡散通信方式による
受信機において、主信号データを逆拡散する際の拡散符
号の誤再生を少なくし、更に再生の時間短縮化が可能と
なる。As described above, according to the present invention, the probability of non-detection and erroneous detection is reduced in the code synchronization acquisition of the signal which has passed through the transmission line in which the instantaneous fluctuation occurs.
Furthermore, the synchronization acquisition time can be shortened. As a result, in a receiver using a spread spectrum communication system by direct spreading, it is possible to reduce erroneous reproduction of a spread code when despreading main signal data, and further shorten reproduction time.
【図１】は本発明の第１の実施例の装置の構成図、FIG. 1 is a block diagram of an apparatus according to a first embodiment of the present invention,
【図２】は本実施例におけるアドレスカウンタの動作を
説明する図、FIG. 2 is a diagram for explaining the operation of the address counter in this embodiment,
【図３】は本発明の第２の実施例の装置の構成図、FIG. 3 is a block diagram of an apparatus according to a second embodiment of the present invention,
【図４】は本発明の第３の実施例の装置の構成図、FIG. 4 is a block diagram of an apparatus according to a third embodiment of the present invention,
【図５】は本発明の第４の実施例の装置の構成図、FIG. 5 is a block diagram of an apparatus according to a fourth embodiment of the present invention,
【図６】は本発明の第５の実施例の装置の構成図、FIG. 6 is a block diagram of an apparatus according to a fifth embodiment of the present invention,
【図７】は本発明の第６の実施例の装置の構成図、FIG. 7 is a block diagram of an apparatus according to a sixth embodiment of the present invention,
【図８】は一例のフェージングによる相関値の未検出を
説明する図、FIG. 8 is a diagram illustrating non-detection of a correlation value due to fading of an example;
【図９】は従来例のスライディング相関器の構成図であ
る。FIG. 9 is a block diagram of a sliding correlator of a conventional example.
１は乗算器、 ２は加算器、 ３は加算値ラッチ回路、
４は位相スライド回路、 ５は拡散符号発生器、 ６は
分周器、７は最大相関値検出器、 ８、8-1 〜8-N は相
関値ラッチ回路、９、9-1 〜9-N は位相ラッチ回路、
10は分周器、11はアドレスカウンタ、 12は累積メモ
リ、 13は相関値判定部、14はしきい値設定部、 15、
15' はタイミング比較器、16は上位Ｎ個相関器検出器を
示す。1 is a multiplier, 2 is an adder, 3 is an addition value latch circuit,
4 is a phase slide circuit, 5 is a spread code generator, 6 is a frequency divider, 7 is a maximum correlation value detector, 8 and 8-1 to 8-N are correlation value latch circuits, and 9 and 9-1 to 9- N is the phase latch circuit,
10 is a frequency divider, 11 is an address counter, 12 is a cumulative memory, 13 is a correlation value determination unit, 14 is a threshold value setting unit, 15,
Reference numeral 15 'indicates a timing comparator, and 16 indicates an upper N correlator detector.
Claims (6)
号を受信するスペクトラム拡散信号受信装置であって、 該拡散符号と速度が等しい基本クロックを分周して出力
する分周手段と、 該分周手段の出力クロックの速度で該拡散符号を発生さ
せる拡散符号発生手段と、 受信したスペクトラム拡散信号を該拡散符号発生手段の
出力により逆拡散して出力する逆拡散手段と、 該基本クロックの速度で該拡散符号の一周期分に対応す
る数を所定の順序でカウントし、該一周期分のカウント
の終了ごとにカウントの開始値を１だけずらせた値から
該開始値の直前の値まで循環してカウントし、各カウン
ト値を記憶手段のアドレスとして与えるアドレス算出手
段と、 該逆拡散手段の出力を入力して、各アドレスごとに累積
加算し、該加算結果を各アドレスに記憶する記憶手段
と、 該記憶手段の各アドレスの出力より相関値の最大値を求
める最大相関値検出手段とを有することを特徴とするス
ペクトラム拡散信号受信装置。1. A spread spectrum signal receiving apparatus for receiving a signal spread by a spread code of a predetermined speed, said frequency dividing means for dividing and outputting a basic clock having the same speed as said spread code, and said dividing means. Spread code generating means for generating the spread code at the speed of the output clock of the frequency dividing means, despreading means for despreading the received spread spectrum signal by the output of the spread code generating means, and outputting the basic clock. Then, the number corresponding to one cycle of the spread code is counted in a predetermined order, and at each end of the count for one cycle, the count start value is shifted by 1 to a value immediately before the start value. Address counting means for giving each count value as an address of the storing means and the output of the despreading means, and cumulatively adding for each address, and adding results Storage means for storing the scan, the spread spectrum signal receiving apparatus characterized by having a maximum correlation value detecting means for obtaining a maximum value of the correlation values from the output of each address of said memory means.
の最大値が所定のしきい値より大きいとき同期捕捉がさ
れたと判定する相関値判定手段を設けたことを特徴とす
る請求項１に記載のスペクトラム拡散信号受信装置。2. A correlation value judging means for judging that the synchronization is acquired when the maximum value of the correlation values obtained by the maximum correlation value detecting means is larger than a predetermined threshold value. The spread spectrum signal receiving device according to.
い値は、前記受信したスペクトラム拡散信号が伝送され
てきた伝送路の情報により決定されることを特徴とする
請求項２に記載のスペクトラム拡散信号受信装置。3. The spread spectrum according to claim 2, wherein the predetermined threshold value in the correlation value determination means is determined by information of a transmission line through which the received spread spectrum signal is transmitted. Signal receiving device.
拡散符号の連続する周期において同一の位相で検出され
た場合に、その位相で同期捕捉がされたと判定するタイ
ミング比較手段を設けたことを特徴とする請求項１に記
載のスペクトラム拡散信号受信装置。4. When the maximum correlation value according to claim 1 is detected in the same phase in successive cycles of the spread code, timing comparison means is provided to determine that synchronization has been acquired in that phase. The spread spectrum signal receiving apparatus according to claim 1, wherein
段の代わりに、前記記憶手段の出力より上位Ｎ個の相関
値を求める上位Ｎ個相関値検出手段を設けたことを特徴
とする請求項１に記載のスペクトラム拡散信号受信装
置。5. A maximum N correlation value detecting means for obtaining the upper N correlation values from the output of the storage means is provided in place of the maximum correlation value detecting means according to claim 1. The spread spectrum signal receiving apparatus according to claim 1.
の各位相がそれぞれ拡散符号の連続する周期において同
一の位相で検出された場合に、該各位相で同期捕捉がさ
れたと判定するタイミング比較手段を設けたことを特徴
とする請求項１に記載のスペクトラム拡散信号受信装
置。6. When the respective phases of the upper N correlation values according to claim 5 are detected at the same phase in successive cycles of the spreading code, it is determined that synchronization has been acquired at the respective phases. The spread spectrum signal receiving apparatus according to claim 1, further comprising timing comparison means for performing the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7283329A JPH09130299A (en) | 1995-10-31 | 1995-10-31 | Spread spectrum signal reception equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7283329A JPH09130299A (en) | 1995-10-31 | 1995-10-31 | Spread spectrum signal reception equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09130299A true JPH09130299A (en) | 1997-05-16 |
Family
ID=17664073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7283329A Withdrawn JPH09130299A (en) | 1995-10-31 | 1995-10-31 | Spread spectrum signal reception equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09130299A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100322744B1 (en) * | 2000-01-11 | 2002-02-07 | 윤종용 | Despreading apparatus and method for CDMA signal |
| KR100380770B1 (en) * | 1999-06-09 | 2003-04-18 | 닛본 덴기 가부시끼가이샤 | Spread spectrum receiver |
| US6556620B1 (en) | 1999-01-21 | 2003-04-29 | Nec Electronics Corporation | Synchronization acquisition device for both preventing erroneous detection due to noise and reducing required storage capacity |
| JP2003158473A (en) * | 2001-10-08 | 2003-05-30 | Rohde & Schwarz Gmbh & Co Kg | Method for determining time offset of cdma signal |
| US6798825B1 (en) * | 1998-01-05 | 2004-09-28 | Intel Corporation | Method for using circular spreading codes to achieve high bit densities in a direct-sequence spread spectrum communication system |
-
1995
- 1995-10-31 JP JP7283329A patent/JPH09130299A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6798825B1 (en) * | 1998-01-05 | 2004-09-28 | Intel Corporation | Method for using circular spreading codes to achieve high bit densities in a direct-sequence spread spectrum communication system |
| US6556620B1 (en) | 1999-01-21 | 2003-04-29 | Nec Electronics Corporation | Synchronization acquisition device for both preventing erroneous detection due to noise and reducing required storage capacity |
| KR100380770B1 (en) * | 1999-06-09 | 2003-04-18 | 닛본 덴기 가부시끼가이샤 | Spread spectrum receiver |
| KR100322744B1 (en) * | 2000-01-11 | 2002-02-07 | 윤종용 | Despreading apparatus and method for CDMA signal |
| JP2003158473A (en) * | 2001-10-08 | 2003-05-30 | Rohde & Schwarz Gmbh & Co Kg | Method for determining time offset of cdma signal |
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