On Noncoherent MIMO Channels in the Wideband Regime: Capacity and Reliability
On Noncoherent MIMO Channels in the Wideband Regime: Capacity and Reliability
复制标题
宽带体制中的非相干 MIMO 信道：容量和可靠性
DOI：
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发表时间：
2006
影响因子：
2.5
通讯作者：
Lizhong Zheng
中科院分区：
文献类型：
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作者：
S. Ray;M. Médard;Lizhong Zheng
我们考虑一个多输入多输出（MIMO）的宽带瑞利块衰落信道的信道状态是未知的发射机和接收机，只有一个平均功率约束的输入。我们计算的容量，并分析其依赖于相干长度，天线的数量和接收信号噪声比（SNR）每自由度。我们建立的相干长度和天线数量的非相干信道的条件，有一个“近相干”的性能在宽带制度。我们还提出了一个信令方案，是近容量实现在这个制度。我们计算了这种宽带非相干MIMO信道的错误概率，并研究了它对信噪比，发射和接收天线的数量和相干长度的依赖性。我们发现，错误概率衰减成反比的相干长度和指数的产品的发射和接收天线的数量。此外，信道中断主导的错误概率在宽带制度。我们还表明，临界以及截止率是远远小于通道容量在这一制度
We consider a multiple-input multiple-output (MIMO) wideband Rayleigh block-fading channel where the channel state is unknown to both the transmitter and the receiver and there is only an average power constraint on the input. We compute the capacity and analyze its dependence on coherence length, number of antennas and receive signal-to-noise ratio (SNR) per degree of freedom. We establish conditions on the coherence length and number of antennas for the noncoherent channel to have a "near-coherent" performance in the wideband regime. We also propose a signaling scheme that is near-capacity achieving in this regime. We compute the error probability for this wideband noncoherent MIMO channel and study its dependence on SNR, number of transmit and receive antennas and coherence length. We show that error probability decays inversely with coherence length and exponentially with the product of the number of transmit and receive antennas. Moreover, channel outage dominates error probability in the wideband regime. We also show that the critical as well as cutoff rates are much smaller than channel capacity in this regime