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首页> 外文会议>Annual Allerton Conference on Communication, Control, and Computing; 20040929-1001; Monticello,IL(US) >Iterative Channel Estimation and Decoding for the Multi-path Channels with RAKE reception
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Iterative Channel Estimation and Decoding for the Multi-path Channels with RAKE reception

机译：具有RAKE接收的多路径信道的迭代信道估计和解码

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摘要

We study an improved receiver with iterative channel estimation and decoding. A soft modulator processes the soft output of the Turbo decoder after a decoding iteration. If some symbols are deemed reliable at the output of the soft modulator, then these symbols act as extra pilot symbols for the channel estimator to refine the channel estimates that aid the demodulator, whose output is given to the decoder for another decoding iteration. The conventional Turbo decoder needs to be modified to yield soft information for both the systematic as well as the parity bits and two methods are presented to accomplish this. To keep the complexity in terms of memory and processing low, the iterative channel estimation is done on the equivalent channel at the output of the RAKE combiner instead of per-finger iterative channel estimation before the RAKE combining. Numerical results are presented that show that good improvement is possible over the current receiver.
机译：我们研究了一种具有迭代信道估计和解码功能的改进型接收机。在解码迭代之后，软调制器处理Turbo解码器的软输出。如果某些符号在软调制器的输出处被认为是可靠的，则这些符号充当信道估计器的额外导频符号，以细化有助于解调器的信道估计，该解调器的输出被提供给解码器以进行另一次解码迭代。需要对常规Turbo解码器进行修改，以针对系统位和奇偶校验位产生软信息，并提出了两种方法来实现此目的。为了使存储器和处理方面的复杂度保持较低，在RAKE合并器的输出端的等效信道上进行迭代信道估计，而不是在RAKE合并之前按手指进行迭代信道估计。数值结果表明，与目前的接收器相比，有可能实现良好的改进。

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