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首页> 外文OA文献 >EM based MAP channel estimation for turbo/convolutional coded SFBC/STBC-OFDM systems [Turbo/katlamali kodlanmiş SFBC/STBC-OFDM sistemlerinde yinelemeli kanal kestirimi]
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EM based MAP channel estimation for turbo/convolutional coded SFBC/STBC-OFDM systems [Turbo/katlamali kodlanmiş SFBC/STBC-OFDM sistemlerinde yinelemeli kanal kestirimi]

机译：Turbo /卷积编码SFBC / STBC-OFDM系统中基于EM的MAP信道估计[涡轮增压/折叠编码SFBC / STBC-OFDM系统中的递归信道估计]

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摘要

We consider the design of turbo receiver structures for space-frequency block coded (SFBC/STBC) OFDM systems in unknown frequency selective fading channels. The Turbo receiver structures for SFBC/STBC-OFDM systems under consideration consists of an iterative MAP Expectation/Maximization (EM) channel estimation algorithm, soft MMSE SFBC/STBC decoder and a soft MAP outer-channel-code decoder. MAP-EM employs iterative channel estimation and it improves receiver performance by re-estimating the channel after each decoder iteration. Moreover, the MAP-EM approach considers the channel variations as random processes and applies the Karhunen-Loeve (KL) orthogonal series expansion. The performance of the proposed approaches are studied in terms of mean square error and bit-error rate. Through experimental results, the effect of a pilot spacing on the channel estimator performance and sensitivity of turbo receiver structures on channel estimation error are studied. © 2006 IEEE.
机译：我们考虑在未知频率选择性衰落信道中针对空频分组编码（SFBC / STBC）OFDM系统的Turbo接收机结构的设计。所考虑的SFBC / STBC-OFDM系统的Turbo接收机结构包括迭代MAP期望/最大化（EM）信道估计算法，软MMSE SFBC / STBC解码器和软MAP外信道代码解码器。 MAP-EM采用迭代信道估计，并且通过在每次解码器迭代后重新估计信道来提高接收器性能。此外，MAP-EM方法将信道变化视为随机过程，并应用Karhunen-Loeve（KL）正交序列展开。从均方误差和误码率的角度研究了所提出方法的性能。通过实验结果，研究了导频间隔对信道估计器性能和涡轮接收机结构灵敏度对信道估计误差的影响。 ©2006 IEEE。

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