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基于广义加扰的时域压缩扩频抗干扰能力增强方法 被引量:3
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作者 石荣 《无线电通信技术》 2021年第1期96-103,共8页
时域压缩扩频是继传统直接序列扩频之后写入通信传输标准的又一种新的扩频通信方式,其不仅具有抗频域窄带干扰的能力,还具有抗时域脉冲干扰的特点。在对时域压缩扩频与传统直接序列扩频特性对比分析的基础上,针对该类信号抗同周期宽带... 时域压缩扩频是继传统直接序列扩频之后写入通信传输标准的又一种新的扩频通信方式,其不仅具有抗频域窄带干扰的能力,还具有抗时域脉冲干扰的特点。在对时域压缩扩频与传统直接序列扩频特性对比分析的基础上,针对该类信号抗同周期宽带干扰能力不足的问题,通过广义加扰来消除其频域离散化线谱特征,在保持其原有抗干扰性能的基础上增强了对周期性干扰的抵抗能力,并通过压缩信号重复次数的调节实现了扩频增益的灵活控制。仿真结果验证了理论分析的正确性与有效性,不仅为时域压缩扩频通信的抗干扰性能提升和自适应抗干扰通信传输提供了重要理论指导,也为该类信号的工程优化应用提供了重要参考。 展开更多
关键词 时域压缩扩频 直接序列扩频 多重复制 广义加扰 扩频增益控制 抗频域窄带干扰 抗脉冲干扰 抗周期性干扰
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Digital AGC Based on Coherent Adjustment Cycle for DSSS Receiver 被引量:3
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作者 SHEN Yuyao WANG Yongqing +1 位作者 SHENG Dewei WU Siliang 《China Communications》 SCIE CSCD 2015年第2期95-106,共12页
In order to meet the requirements for zero value stability of direct sequence spread spectrum(DSSS) signal processing in high dynamic scenario,digital automatic gain control(AGC) is employed to regulate power.However,... In order to meet the requirements for zero value stability of direct sequence spread spectrum(DSSS) signal processing in high dynamic scenario,digital automatic gain control(AGC) is employed to regulate power.However,conventional AGC causes degradation in the synchronization performance of DSSS receiver.Based on the theoretical analysis of the influence of digital AGC on DSSS signal synchronization,this paper proposes a new AGC algorithm,which is applicable to multi-channel digital DSSS signal receiver.By making power adjustment cycle and synchronization cycle coherent with each other adaptively,the influence of digital AGC on subsequent synchronization processing has been eliminated.Theoretical analysis,simulation results and experimental data verify the validity of the proposed algorithm.By virtue of the proposed algorithm,the influence of digital AGC on DSSS signal synchronization is eliminated.This algorithm applies to an aerospace engineering project successfully. 展开更多
关键词 DSSS receiver digital AGC acquisition tracking
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Acquisition algorithm assisted by AGC control voltage for DSSS signals 被引量:4
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作者 SHEN YuYao WANG YongQing +1 位作者 LIU MinLi WU SiLiang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第12期2195-2206,共12页
An appropriate acquisition configuration in terms of signal quality can optimize the acquisition performance. In view of this, a new approach of acquisition assisted by the control voltage of automatic gain control(AG... An appropriate acquisition configuration in terms of signal quality can optimize the acquisition performance. In view of this, a new approach of acquisition assisted by the control voltage of automatic gain control(AGC) is proposed. This approach judges the signal power according to the AGC control voltage and switches the working modes correspondingly and adaptively. Non-coherent accumulation times and the detection threshold are reconfigured according to the working mode. Theoretical derivation and verification by simulation in typical situations are provided, and the algorithm is shown to be superior in terms of the mean acquisition time, especially in strong signal scenarios compared with the conventional algorithm. 展开更多
关键词 direct sequence spread spectrum ACQUISITION AGC control voltage carrier-to-noise density ratio estimation adaptive working mode switch
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