Performance analysis of the DS/SS communications receiver implementing a short time Fourier transform interference excision system

Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis (Cat. No.98TH8380) Pub Date : 1998-10-06 DOI:10.1109/TFSA.1998.721444

X. Ouyang, M. Amin

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引用次数: 6

Abstract

The short-time Fourier transform (STFT) is employed for nonstationary jammer excision in direct sequence spread spectrum (DS/SS) communication systems. The received signal is first analyzed by the STFT. The localized interferers in the time-frequency (t-f) domain are then removed by binary excisions. Finally, the synthesized signal is correlated with the PN sequence and passed to the detector. The selection of both the data window and the distribution of the binary excision values in the t-f domain are key to effective removal of the jammer with a minimum distortion of the DS/SS communication signal. Proper data windows localize the interference in as few t-f bins as possible, whereas good binary excision assigns zero values to only those t-f bins contaminated by the jammer t-f signature. The closed form expression of the receiver SNR is derived as a function of the binary excision values in the t-f domain. The specific cases of impulsive and sinusoidal jammers are analyzed.

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实现短时傅里叶变换干扰去除系统的DS/SS通信接收机性能分析

将短时傅里叶变换(STFT)用于直接序列扩频(DS/SS)通信系统的非平稳干扰去除。接收到的信号首先由STFT进行分析。在时频(t-f)域的局部干扰，然后通过二进制切除去除。最后，将合成信号与PN序列进行相关并传递给检测器。数据窗口的选择和t-f域中二值切除值的分布是有效去除干扰的关键，同时使DS/SS通信信号失真最小。适当的数据窗口将干扰定位在尽可能少的t-f箱中，而良好的二进制切除只将那些被干扰者t-f签名污染的t-f箱赋零值。接收机信噪比的封闭形式表达式推导为t-f域中二进制切除值的函数。分析了脉冲干扰机和正弦干扰机的具体情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis (Cat. No.98TH8380)

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