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首页> 外文期刊>Wireless personal communications: An Internaional Journal >Multi-user Performance of Relay-Aided MC-CDMA Downlink System Employing Transmitter Preprocessing Based on Feedback of Vector Quantized CSI
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Multi-user Performance of Relay-Aided MC-CDMA Downlink System Employing Transmitter Preprocessing Based on Feedback of Vector Quantized CSI

机译：基于矢量量化CSI反馈的发射机预处理的中继MC-CDMA下行系统多用户性能

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摘要

The achievable bit-error-rate (BER) performance of a relay-aided downlink (DL) multi-carrier code division multiple access (MC-CDMA) cellular system, where multi-user interference (MUI) and inter-relay interference (IRI) are the dominant channel impairments is investigated in this paper, principally from a transmitter signal processing perspective. Specifically, in this paper, we investigate the considered system by employing three cooperation strategies. The MUI and IRI are mitigated with the aid of the transmitter preprocessing (TP) operated at the base station (BS) and relays, respectively. The TP operated at the BS that suppresses the MUI at the relays is based on the maximum-signal-to-interference-plus-noise ratio approach, while that operated at the relays that mitigates the IRI relies on the classical transmit minimum-mean-square-error principle. Further, the TP in our work is constructed with the aid of vector-quantized channel state information (VQ-CSI) acquired via feedback channels. Our simulation study shows that relay-aided cooperative DL MC-CDMA system employing TP, results in better achievable BER, as the TP helps in achieving the relay-diversity by mitigating the DL-MUI and IRI at the relays and DMSs, respectively. Furthermore, our study demonstrates that the resultant BER performance of the VQ-CSI based TP remains close to that achieved with the perfect CSI based TP. Hence, we advocate that the feedback of the VQ-CSI to the transmitter for conceiving the preprocessing can be considered as an efficient approach, particularly in a frequency division duplex type wireless system.
机译：中继辅助下行链路（DL）多载波码分多址（MC-CDMA）蜂窝系统的可实现的误码率（BER）性能，其中多用户干扰（MUI）和中继间干扰（IRI）本文主要从发射机信号处理的角度研究了主要信道损伤。具体而言，在本文中，我们通过采用三种合作策略来研究所考虑的系统。 MUI和IRI分别借助在基站（BS）和中继站进行操作的发射机预处理（TP）得以缓解。在BS处操作的TP抑制中继器处的MUI基于最大信号与干扰加噪声比的方法，而在中继器处操作以减轻IRI的TP基于经典的发射最小均值。平方误差原理。此外，在我们的工作中，TP是通过通过反馈通道获取的矢量量化通道状态信息（VQ-CSI）来构造的。我们的仿真研究表明，采用TP的中继辅助协作DL MC-CDMA系统可实现更好的BER，因为TP通过分别减轻中继和DMS的DL-MUI和IRI来帮助实现中继分集。此外，我们的研究表明，基于VQ-CSI的TP的最终BER性能仍然接近于基于理想CSI的TP所获得的BER性能。因此，我们主张将VQ-CSI反馈给发射机以进行预处理的想法可以被视为一种有效的方法，尤其是在频分双工型无线系统中。

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