Using multiple antennas in wireless communication systems proposes some degrees of freedom in system design, these degrees of freedom can be applied to improve the system reliability by using Space Time Block Coding (...
详细信息
ISBN:
(纸本)9781424421077
Using multiple antennas in wireless communication systems proposes some degrees of freedom in system design, these degrees of freedom can be applied to improve the system reliability by using Space Time Block Coding (STBC) which provides diversity gain. Degrees of freedom also can be applied to increase the system capacity using Spatial multiplexing (SM) methods. It is possible to achieve a trade-off between diversity gain and Spatial multiplexing gain. Selecting the method which provides best efficiency for a specific system is an important issue. In this paper we will show which space-time architecture achieves the best efficiency for a specific system in practical cases. This classification depends on the desired data rate, number of transmission antennas, modulation order, SNR regime and channel state.
In [1]. antenna selection for multiple antenna transmission systems has been studied under the assumption that the subchannels between antenna pairs fade independently. In this paper, we consider the performance of su...
详细信息
ISBN:
(纸本)0780385330
In [1]. antenna selection for multiple antenna transmission systems has been studied under the assumption that the subchannels between antenna pairs fade independently. In this paper, we consider the performance of such systems when the subchannels experience correlated fading. We assume that the channel state information is available only at the receiver. the antenna selection is performed only at the receiver, and the selection is based on the instantaneous received signal power. We quantify the effects of channel correlation on the diversity and coding gain when the receiver system uses all or a subset of the antennas. Theoretical results indicate that the correlations in the channel does not degrade the diversity order provided that the channel is full-rank. However, it does result in some performance loss in the coding gain. Furthermore, for non-full-rank channels. the diversity order of the system degrades significantly and is determined by the rank of the channel correlation matrix.
暂无评论