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On Antijamming in General CDMA Systems-Part II: Antijamming Performance of Coded Multicarrier Frequency-Hopping Spread Spectrum Systems

机译:常规CDMA系统中的抗干扰问题-第二部分:编码多载波跳频扩频系统的抗干扰性能

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In the first part of the paper, the capacity of a general multiuser code division multiple access (CDMA) jamming channel was analyzed for noncooperative and cooperative users in uplink and downlink static and Nakagami fading channels when the receiver has or lacks jammer state information. The results were applied to a unified channel model encompassing a variety of multiuser spread spectrum systems contaminated by jamming. It was found that the jammer should spread its energy evenly over all degrees of freedom in order to minimize the average capacity. In the second part of the paper, using a standard orthogonal frequency division multiplexing (OFDM) model, the performance of a coded version of a multicarrier frequency-hopping (MC-FH) CDMA system in static and Rayleigh fading jamming uplink channels is analyzed. The MC-FH system under study is a hybrid of the OFDM and frequency hopping concepts, and is also a practical example of the model developed in the first part. It is demonstrated that in the cases where the receiver knows the jammer state and the receiver lacks the jammer state, spreading and contracting the jamming power over the system bandwidth, respectively, will give rise to the worst performance for the communicators. Optimal decorrelator weights for the receiver soft outputs in different channels, valuable for practical system design, are also obtained.
机译:在本文的第一部分中,分析了当接收器有或没有干扰状态信息时,上行和下行静态和Nakagami衰落信道中非合作和协作用户的通用多用户码分多址(CDMA)干扰信道的容量。将结果应用于统一信道模型,该模型包含受干扰污染的多种多用户扩频系统。发现干扰器应在所有自由度上平均分配其能量,以使平均容量最小。在本文的第二部分中,使用标准正交频分复用(OFDM)模型,分析了多载波跳频(MC-FH)CDMA系统的编码版本在静态和瑞利衰落干扰上行链路信道中的性能。所研究的MC-FH系统是OFDM和跳频概念的混合体,也是在第一部分中开发的模型的实际示例。已经证明,在接收机知道干扰状态而接收机缺乏干扰状态的情况下,分别在系统带宽上扩展和收缩干扰功率将导致通信器的最差性能。还获得了不同通道中接收机软输出的最佳去相关器权重,这对实际系统设计很有价值。

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