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On Schemes for Multirate Support in DS-CDMA Systems

机译:DS-CDMA系统中的多速率支持方案

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摘要

Different modulation schemes supporting multiple data rates in a Direct Sequence Code Division Multiple Access (DS-CDMA) system are studied. Both AWGN and multipath Rayleigh fading channels are considered. It is shown that the multi processing-gain scheme and the multi-channel scheme have almost the same performance. However, the multi-channel scheme may have some advantages due to easier code design and multiuser receiver construction. The drawback though, is the need for linear amplifiers also in mobile terminals. A multi-modulation scheme is also possible, but the performance for the users with the high data rates are significantly worse than for the other schemes. Furthermore multi chip-rate, parallel combinatory spread spectrum (PC/SS), pulse position modulation (PPM) and variable duty cycle schemes are discussed briefly.
机译:研究了在直接序列码分多址(DS-CDMA)系统中支持多种数据速率的不同调制方案。同时考虑了AWGN和多径瑞利衰落信道。结果表明,多处理增益方案和多通道方案具有几乎相同的性能。然而,由于更容易的代码设计和多用户接收机的构造,多信道方案可能具有一些优势。但是,缺点是在移动终端中也需要线性放大器。多调制方案也是可能的,但是具有高数据速率的用户的性能明显比其他方案差。此外,还简要讨论了多码片速率,并行组合扩频(PC / SS),脉冲位置调制(PPM)和可变占空比方案。

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