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首页> 外文会议>IEEE Vehicular Technology Conference >Rake receiver detection of adaptive modulation aided CDMA over frequency selective channels
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Rake receiver detection of adaptive modulation aided CDMA over frequency selective channels

机译：频率选择通道的自适应调制辅助CDMA的Rake接收器检测

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摘要

A closed form Bit Error Ratio (BER) formula is derived for a fixed-mode Quadrature Amplitude Modulation (QAM) scheme employing Rake receivers and receiver antenna diversity. The analysis is extended to constant power Adaptive QAM (AQAM) expressing the average BER and the average throughput as a closed form function of the modulation mode switching levels. Then, the switching levels are optimized so that the average throughput is maximized, while maintaining a given target BER. This results in a constant-BER, variable-throughput arrangement. The results show that our constant-power AQAM scheme exhibits an SNR gain of about 5 dB in comparison to fixed-mode QAM, when operating over a Wireless Asynchronous Transfer Mode (W-ATM) channel employing one antenna. However, the achievable throughput gain of the system over conventional fixed-mode modems is substantially reduced, as the diversity order of the receiver is increased.
机译：用于采用Rake接收机和接收器天线分集的固定模式正交调制（QAM）方案来导出闭合的误码比率（BER）公式。该分析扩展到表达平均BER的恒功率自适应QAM（AQAM）和作为调制模式切换电平的闭合形式函数的平均吞吐量。然后，优化开关电平，使得平均吞吐量最大化，同时保持给定的目标BER。这导致恒定的可变吞吐量安排。结果表明，与采用一个天线的无线异步传输模式（W-ATM）通道运行时，我们的恒定功率AQAM方案与固定模式QAM相比，与固定模式QAM相比，SNR增益约为5 dB。然而，通过传统的固定模式调制解调器实现系统的可实现的吞吐量增益基本上减少，因为接收器的分集顺序增加。

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