Performance Analysis of Large CDMA Random Access Systems with Retransmission Diversity over Fading Channels
Performance Analysis of Large CDMA Random Access Systems with Retransmission Diversity over Fading Channels
复制标题
具有重传分集的大型CDMA随机接入系统在衰落信道上的性能分析
DOI：
10.3837/tiis.2010.08.004
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发表时间：
2010-08
影响因子：
1.5
通讯作者：
Yu, Kai
中科院分区：
文献类型：
--
作者：
Fan, Pingzhi;Lei, Xianfu;Sun, Yi;Shu, Lei;Yu, Kai
在用户数和扩展增益均为无穷大且二者之比趋于一常数的假设下，研究了衰落信道下随机扩频码分多址（CDMA）系统中采用重传分集（RD）的随机接入问题.的信号干扰噪声比（SINR）的下限示出几乎肯定收敛到一个常数。得到了主要系统的吞吐量、频谱效率和能量效率。仿真结果证实了分析结果。我们发现，在高流量负载的吞吐量与衰落是高于没有。当能量效率增加时，由于SNR增加或减小，频谱效率趋向于两个相反的值。对于普通的稳定系统，稳定区域被证明是缩小的业务量的增加和扩大与RD就业。
The random access systems, with retransmission diversity (RD) employment, over large random spreading code division multiple access (CDMA) channel subject to fading is investigated, under the assumption of infinite number of users and infinite spreading gain with their ratio converging to a constant. The low bound of the signal to interference and noise ratio (SINR) is shown to converge almost surely to a constant. The throughput, spectrum efficiency and energy efficiency in the dominating systems are obtained. The analytical results are confirmed by simulations. We find that in high traffic loads the throughput with fading is higher than that without. When the energy efficiency increases, the spectrum efficiency tends to two contrary values due to SNR increases or decreases. For the ordinary stable systems, the stability region is shown to shrink as the traffic increases and enlarge with RD employment.
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DOI：
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发表时间：
1985-03
期刊：
IEEE Trans. Inf. Theory
影响因子：
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影响因子：
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