Iterative turbo beamforming for orthogonal frequency division multiplexing-based hybrid terrestrial-satellite mobile system
Iterative turbo beamforming for orthogonal frequency division multiplexing-based hybrid terrestrial-satellite mobile system
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DOI：
10.1049/iet-com.2010.1133
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发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
Ammar H. Khan;M. Imran;B. Evans
中科院分区：
文献类型：
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作者：
Ammar H. Khan;M. Imran;B. Evans
在基于正交频分复用（OFDM）的系统的上下文中，基于导频的波束成形（BF）表现出对导频子载波的高度敏感性。增加参考导频的数量显著地改善了BF性能以及系统性能。然而，这种增加是以数据吞吐量为代价的，数据吞吐量由于额外导频的传输而不可避免地缩小。因此，可以在不发送附加导频的情况下增加BF过程可用的参考信号的方法可以在不损害吞吐量的情况下展现出上级系统性能。因此，作者提出了一种新的三阶段迭代涡轮波束形成（ITBF）算法的OFDM为基础的混合地面-卫星移动的系统，它利用导频和数据来执行干扰抑制。数据子载波在BF过程中被用作虚拟参考信号。结果表明，当与非迭代传统BF相比，建议ITBF具有高达2.5 dB的误码率增益，只有一个迭代。
In the context of orthogonal frequency division multiplexing (OFDM)-based systems, pilot-based beamforming (BF) exhibits a high degree of sensitivity to the pilot sub-carriers. Increasing the number of reference pilots significantly improves BF performance as well as system performance. However, this increase comes at the cost of data throughput, which inevitably shrinks due to transmission of additional pilots. Hence an approach where reference signals available to the BF process can be increased without transmitting additional pilots can exhibit superior system performance without compromising throughput. Thus, the authors present a novel three-stage iterative turbo beamforming (ITBF) algorithm for an OFDM-based hybrid terrestrial-satellite mobile system, which utilises both pilots and data to perform interference mitigation. Data sub-carriers are utilised as virtual reference signals in the BF process. Results show that when compared to non-iterative conventional BF, the proposed ITBF exhibits bit error rate gain of up to 2.5 dB with only one iteration.