波束赋形
计算机科学
干扰(通信)
频道(广播)
多输入多输出
衰退
自适应波束形成器
信道状态信息
电子工程
电信线路
无线
发射机
信噪比(成像)
信噪比
预编码
算法
单天线干扰消除
同频道干扰
发射机功率输出
基站
瑞利衰落
作者
Redha M. Radaydeh,Mohamed-Slim Alouini
标识
DOI:10.1109/twc.2011.060811.100978
摘要
The impact of co-channel interference on the performance of adaptive generalized transmit beamforming for low-complexity multiple-input single-output (MISO) configuration is investigated. The transmit channels are assumed to be sufficiently separated and undergo Rayleigh fading conditions. Due to the limited space, a single receive antenna is employed to capture desired user transmission. The number of active transmit channels is adjusted adaptively based on statistically unordered and/or ordered instantaneous signal-to-noise ratios (SNRs), where the transmitter has no information about the statistics of undesired signals. The adaptation thresholds are identified to guarantee a target performance level, and the adaptation schemes with enhanced spectral efficiency or power efficiency are studied and their performance are compared under various channels conditions. To facilitate comparison studies, results for the statistics of instantaneous combined signal-to-interference-plus-noise ratio (SINR) are derived, which can be applied for different fading conditions of interfering signals. The statistics for combined SNR and combined SINR are then used to quantify various performance measures, considering the impact of non-ideal estimation of the desired user channel state information (CSI) and the randomness in the number of active interferers. Numerical and simulation comparisons for the achieved performance of the adaptation schemes are presented.
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