Acquisition of a Spread Spectrum Signal with Frequency Offset

采集具有频率偏移的扩频信号

• 批准号: 07805037
• 负责人: KATAYAMA Masaaki
• 金额: $ 1.02万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07805037/
• 关键词: Low Earth-Orbital Satellite System; Spread Spectrum Sommunication; Carrier Frequency Offset; Acquisition of a Spreading Sequence; Estimation of the Carrier Frequency; FFT; Divided Matched Filter; Signal Processing; スペクトル拡散通信システム; 高速同期捕捉; M値スペクトル

In this research, initial acquisition of a Spread Spectrum (SS) signal under large frequency offset is investigated. The following two schemes are proposed and evaluated. The schemes and main results are as follows.1.Divide Matched Filter MethodIn this method, the spreading sequence is divied into a set of sub-sequences and a bank of matched filters, which are corresponding to the sub-sequences, are prepared in the initial acquisition circuit. The circuit then stores the output of the matched filters, and by searching the outputs, it finds the timing, or the phase, of the spreading sequence of the received signal. The results of performance evaluation show that this proposed scheme outperform conventional scheme with a non-divided filter in mean acquisition time under large frequency offset.2. Frequency-Time Domains MethodWhen the frequency offset is very large, even the scheme proposed above can not provide quick synchronization. For this condition, the employment of a set of FFT after the bank of spreading codes with different time-offset is proposed. In this method, the frequency and timing of the received SS signal at the same time. As the results, the advantage of this scheme is shown with the selection of some parameters.

本文研究了大频偏条件下扩频信号的初始采集问题。提出并评价了以下两种方案。方案及主要结果如下：该方法将扩频序列划分为一组子序列，并在初始采集电路中制备一组与子序列相对应的匹配滤波器。然后电路存储匹配滤波器的输出，通过搜索输出，它找到接收信号扩频序列的时序或相位。性能评估结果表明，在大频偏情况下，该方案在平均采集时间上优于传统的非分割滤波方案。频域-时域方法当频偏较大时，即使采用上述方法也无法实现快速同步。针对这种情况，提出了在一组不同时间偏移的扩频码后使用一组FFT。在这种方法中，同时对接收到的SS信号进行频率和时序处理。通过对部分参数的选择，说明了该方案的优越性。

项目成果

S.Okuda: "A New Block Demodulator for DS/SS Signal with Carrier Frequency Offset" Proc.of the IEEE Personal Indoor and Mobile Radio Communications Conference. 203-207 (1995)

S.Okuda：IEEE 个人室内和移动无线电通信会议的“一种用于具有载波频率偏移的 DS/SS 信号的新型块解调器”Proc.。

石津 美帆子: "チップ同期が不完全な場合における分割MFを用いた拡散信号の初期同期捕捉特性" 電気関係学会東海支部連合大会講演論文集. 269- (1995)

Mihoko Ishizu：“码片同步不完全时使用分离 MF 的扩频信号的初始同步采集特性”日本电气工程师东海分会会议记录 269-（1995 年）。

M.Mizutani, M.Katayama, T.Yamazato, A.Ogawa: ""Parallel Acquisition of a Direct-Sequence Spread-Spectrum Signal with Frequency Offset"" IEICE Transactions. Vol.J79-A,No.1. 98-104 (1996)

M.Mizutani、M.Katayama、T.Yamazato、A.Okawa：“具有频率偏移的直接序列扩频信号的并行采集”IEICE Transactions。

奥田 慎治: "搬送波周波数偏差を伴うスペクトル拡散信号の周波数・拡散系列同期捕捉" 電子情報通信学会誌(A). J79-A. 1725-1733 (1996)

Shinji Okuda：“带有载波频率偏差的扩频信号的频率和扩频序列同步采集”Journal of IEICE (A) 1725-1733 (1996)。