Decision Feedback Channel Estimation for OFDM with STTD
Decision Feedback Channel Estimation for OFDM with STTD
复制标题
带有 STTD 的 OFDM 决策反馈信道估计
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
F. Adachi
中科院分区：
文献类型：
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作者：
K. Ishihara;K. Takeda;F. Adachi
翻译后摘要-在本文中，我们提出了判决反馈信道估计（DFCE）的正交频分复用（OFDM）与空时编码发射分集（STTD）。通过发送STTD编码的导频来同时估计两个发送信道。为了提高信道估计对快衰落的跟踪能力，在导频的基础上还引入了判决反馈。为了降低噪声和防止误差传播，在时域和频域中应用两个平均滤波器的级联。通过计算机仿真，对采用STTD的OFDM系统的平均误比特率性能进行了评估。据发现，使用DFCE可以实现的Eb/N 0从理想CE的平均BER=10小至2dB的退化。利用接收天线分集接收，Eb/N 0退化可以进一步减小到小至1dB。
Abstract— In this paper, we propose decision feedback channel estimation (DFCE) for orthogonal frequency division multiplexing (OFDM) with space-time coded transmit diversity (STTD). Two transmit channels are simultaneously estimated by transmitting the STTD encoded pilot. To improve the tracking ability of the channel estimation against fast fading, decision feedback is also used in addition to pilot. For noise reduction and prevention of error propagation, the cascade of two averaging filters in timeand frequency-domain is applied. The average bit error rate (BER) performance of OFDM with STTD is evaluated by computer simulation. It is found that the use of DFCE can achieve a degradation in the Eb/N0 from ideal CE of as small as 2dB for an average BER=10. With receive antenna diversity reception, Eb/N0 degradation can be further reduced to as small as 1dB.