TDMA数字蜂窝的距离扩展和短距离性能增强

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002. Pub Date : 2002-11-03 DOI:10.1109/ACSSC.2002.1197242

B. Wei, J. Gibson

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引用次数: 1

摘要

针对EIA/TIA-136系统提出了一种新的系统增强方法，该方法既可以扩展信道的工作范围，又可以提高当前工作范围内的性能。研究了窄带自适应多速率(NB-AMR)语音编解码器和宽带自适应多速率(WB-AMR)语音编解码器在TDMA (TIA/EIA-136) 30 kHz系统中的应用，这两种编解码器都是为200 kHz GSM信道设计的。特别地，我们研究了在有限的信道带宽内自适应地在NB/WB语音编码和错误控制之间分配比特。十七种模式中有四种被精心选择用于新的TDMA/AMR系统。随着信道条件的变化，在编解码器速率之间进行切换，可以产生低于15 dB C/I的范围扩展，同时还可以提高15 dB以上现有工作范围的性能。时隙格式不变，因此该方法与现有的136个系统完全兼容。

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Range extension and short range performance enhancement in TDMA digital cellular

A new system enhancement method is proposed for the EIA/TIA-136 system offering both channel operational range extension and improved performance within the current operational range. The research presented investigates the application of the narrowband adaptive multi-rate (NB-AMR) speech codec and the wideband AMR (WB-AMR) codec, both originally designed for the 200 kHz GSM channel, in the TDMA (TIA/EIA-136) 30 kHz system. In particular, we investigate adaptively allocating bits between NB/WB speech coding and error control within the limited channel bandwidth. Four modes out of seventeen have been carefully chosen for the new TDMA/AMR system. Switching between codec rates as channel conditions change produces range extension below a C/I of 15 dB while also improving performance in the existing operational range above 15 dB. Time slot formats are unchanged so that the method is completely compatible with existing 136 systems.

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Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.

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