Two-Dimensional Block-Spread CDMA Relay Using Virtual-Four-Antenna STCDTD

Two-Dimensional Block-Spread CDMA Relay Using Virtual-Four-Antenna STCDTD
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使用虚拟四天线 STCDTD 的二维块扩频 CDMA 中继

DOI:
10.1109/tvt.2013.2249120
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发表时间:
2013-02
影响因子:
6.8
通讯作者:
Fumiyuki Adachi
Fumiyuki Adachi
中科院分区:
计算机科学2区
文献类型:
--
作者:
Qiyue Yu;Weixiao Meng;Fumiyuki Adachi

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协作通信网络通过允许用户协作并将其他用户的消息中继到目的地,可以利用多用户系统中固有的空间分集。在充分利用多用户协作多输入多输出(Co-MIMO)的同时避免多址干扰(MAI)仍然是一个有趣的问题。本文提出了一种中继方案,将源用户的两个天线和中继用户的两个天线结合起来,形成一个虚拟的四天线空时循环延迟发射分集(STCDTD),并探讨了利用二维块扩频码分多址(CDMA)实现无多址干扰的上行链路传输。当信号通过多址瑞利衰落信道传输时,所提出的方案的理论错误概率被描述。计算机仿真表明,该方案能够在慢衰落信道中避免多址干扰,并能显著改善误比特率。
Cooperative communication networks can exploit the spatial diversity inherent in a multiuser system by allowing users to cooperate and relay other users' messages to a destination. Avoiding the multiple-access interference (MAI) while taking full advantage of the multiuser cooperative multiple-input-multiple-output (Co-MIMO) is still an interesting problem. In this paper, we propose a relay scheme that combines the source user's two antennas and the relay user's two antennas to form a virtual-four-antenna space-time cyclic delay transmit diversity (STCDTD), and explore 2-D block-spread code-division multiple access (CDMA) to achieve MAI-free uplink transmission. The theoretical error probability of the proposed scheme is described, when a signal is transmitted through a multiple-access Rayleigh fading channel. Computer simulations indicate that the proposed scheme is able to avoid the MAI over a slow fading channel and to improve the bit error rate (BER) significantly.
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