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首页> 外文期刊>Communications, IET >Uplink symbol error rate analysis of multicell multiuser-multiple-input–multiple-output systems with minimum mean square error receiver under pilot contamination
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Uplink symbol error rate analysis of multicell multiuser-multiple-input–multiple-output systems with minimum mean square error receiver under pilot contamination

机译：导频污染下具有最小均方误差接收机的多小区多用户多输入多输出系统的上行链路符号误码率分析

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摘要

This paper considers the uplink of a multicell multiuser multiple-input-multiple-output (MIMO) time-division duplexing system, where K mobile users in the target cell send their uncoded M-ary phase shift keying (M-PSK) signals to the target base station (BS) equipped with a linear minimum mean square error (MMSE) receiver in the presence of receiver antenna correlations. By employing the equivalent channel model, the uplink is analysed in terms of symbol error rate (SER), giving approximated closed-form expressions. The complicated functions of the SER can be simplified for the case where all the eigenvalues of the correlation matrix of the target BS are identical or distinct. It is proved that in the high signal to noise ratio (SNR) region, the SER is independent of the correlations between the BS antennas. And due to the existence of pilot contamination and intercell interference, the SER tends to a constant whose value is depended on the number of mobile users in each cell and the interference strength between the cells as well. Finally computer simulations are conducted to show that our approximated expressions have good performance in low SNR even for not large K.
机译：本文考虑了多小区多用户多输入多输出（MIMO）时分双工系统的上行链路，其中目标小区中的K个移动用户将其未编码的M进制相移键控（M-PSK）信号发送至在存在接收机天线相关性的情况下，配备线性最小均方误差（MMSE）接收机的目标基站（BS）。通过采用等效信道模型，可以根据符号错误率（SER）对上行链路进行分析，从而给出近似的封闭式表达式。对于目标BS的相关矩阵的所有特征值相同或不同的情况，可以简化SER的复杂功能。事实证明，在高信噪比（SNR）区域中，SER与BS天线之间的相关性无关。并且由于存在导频污染和小区间干扰，SER趋于一个常数，其值取决于每个小区中的移动用户数量以及小区之间的干扰强度。最后通过计算机仿真表明，即使对于不大的K，我们的近似表达式在低SNR下也具有良好的性能。

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