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首页> 外文期刊>IEICE Transactions on Communications >Iterative Demodulation of M-Ary Orthogonal Signaling Formats in Coded DS-CDMA Systems with Soft Interference Cancellation and Channel Estimation
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Iterative Demodulation of M-Ary Orthogonal Signaling Formats in Coded DS-CDMA Systems with Soft Interference Cancellation and Channel Estimation

机译：具有软干扰消除和信道估计的编码DS-CDMA系统中M-Ary正交信号格式的迭代解调

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摘要

The system under study is a convolutionally coded and orthogonally modulated DS-CDMA system over time-varying frequency-selective Rayleigh fading channels in multiuser environments. Iterative soft demodulation and decoding using the Turbo principle can be applied to such a system to increase the system capacity and performance. To combat multiple access interference (MAI), we incorporate the interference cancellation (IC) and decision-directed channel estimation (CE) in the demodulator. However, both IC and CE are subject to performance degradation due to incorrect decisions. In order to prevent error propagation from the decision feedback, soft interference cancellation and channel estimation assisted demodulation is proposed in this paper. The performance of this strategy is evaluated numerically and proved to be superior to the hard decision-directed approach with a minor increase in complexity.
机译：所研究的系统是在多用户环境中时变频率选择瑞利衰落信道上的卷积编码和正交调制DS-CDMA系统。使用Turbo原理的迭代软解调和解码可以应用于此类系统，以提高系统容量和性能。为了应对多址干扰（MAI），我们在解调器中合并了干扰消除（IC）和决策导向的信道估计（CE）。但是，由于错误的决策，IC和CE均会降低性能。为了防止错误信息从判决反馈中传播出来，提出了软干扰消除和信道估计辅助解调技术。对该策略的性能进行了数字评估，并被证明优于硬决策指导方法，并且复杂性略有增加。

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