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首页> 外文期刊>International Journal on Communications Antenna and Propagation >Quasi Orthogonal Space Time Block Code Over Nakagami-m Frequency Selective Fading Channels with Simple Decoding Complexity
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Quasi Orthogonal Space Time Block Code Over Nakagami-m Frequency Selective Fading Channels with Simple Decoding Complexity

机译：QuakAgami-M频率选择性衰落通道的准正交空间时间块代码简单地解码复杂性

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摘要

In this paper, a Quasi Orthogonal Space Time Coding (QOSTBC) system over Nakagami-m frequency selective fading channels is introduced. The proposed scheme is carried out for the M-QAM modulation schemes assuming imperfect channel state information at the receiver. Inter symbol interference effect introduced due to the assumption of the frequency selective fading channels is eliminated by using the Orthogonal Frequency Division Multiplexing (OFDM) technology. Through the Bit Error Rate (BER) versus Signal to Noise Ratio (SNR) simulation results under different values of both Nakagami-m parameter and channel estimation error, the validity of the proposed technique is demonstrated. The results confirm that the BER in the case of frequency selective fading is overlapped with that of flat fading. This implies that the use of OFDM technology mitigates the effect of Inter-Symbol Interference (ISI) caused by frequency selectivity in the channel. Also, the results show that as the imperfect channel estimation error increases the performance degrades.
机译：在本文中，引入了在Nakagami-M频率选择性衰落通道上的准正交空间编码（QOSTBC）系统。假设接收器处的不完美信道状态信息，为M​​-QAM调制方案进行了所提出的方案。通过使用正交频分复用（OFDM）技术消除了由于频率选择性衰落通道的假设而引入的帧间符号干扰效果。通过误码率（BER）与信噪比（SNR）仿真结果在NAKAGAMI-M参数和信道估计误差的不同值下，证明了所提出的技术的有效性。结果证实，在频率选择性衰落的情况下，BER在扁平衰落的情况下重叠。这意味着使用OFDM技术可以减轻符号间干扰（ISI）在信道中频率选择性引起的效果。此外，结果表明，随着不完全信道估计误差增加性能下降。

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