考虑到天线选择(AS)具有实现简单和性能好等优点,通过仿真评估在不同中继策略场景下天线选择的性能。评估方法如下:中继站第1时隙采用最大比合并算法(MRC),第2时隙选择中继处理后具有最大信道增益的单天线进行信号传输。仿真结果表明:与现有的分布式空时码(DSTBC)和最大比合并、最大比合并和匹配滤波(MF)算法相比,最大比合并加天线选择混合方案在转发重传(AF)和译码重传(DF)策略下都能够提供更优的合速率与误码性能;并且在中继站采用译码转发策略时,该方案表现出优于采用放大转发策略的情形。例如,当误码率(SER)等于10-3时,译码转发策略具有1 d B的信噪比(SNR)增益。
To alleviate the conflict between audibility and distortion in the conventional loudness compensation method, an adaptive multichannel loudness compensation method is proposed for hearing aids. The linear and wide dyn...
详细信息
To alleviate the conflict between audibility and distortion in the conventional loudness compensation method, an adaptive multichannel loudness compensation method is proposed for hearing aids. The linear and wide dynamic range compression （WDRC） methods are alternately employed according to the dynamic range of the band-passed signal and the hearing range （HR） of the patient. To further reduce the distortion caused by the WDRC and improve the output signal to noise ratio （SNR） under noise conditions, an adaptive adjustment of the compression ratio is presented. Experimental results demonstrate that the output SNR of the proposed method in babble noise is improved by at least 1.73 dB compared to the WDRC compensation method, and the average speech intelligibility is improved by 6.0% and 5. 7%, respectively, compared to the linear and WDRC compensation methods.
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