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Iterative Channel Estimation and Decoding for the Multi-path Channels with RAKE Naresh Sharma, Member, IEEE, and Alexei Ashikhmin, Member, IEEE
 

Summary: Iterative Channel Estimation and Decoding for the Multi-path Channels with RAKE
reception
Naresh Sharma, Member, IEEE, and Alexei Ashikhmin, Member, IEEE
Abstract-- We study an improved receiver with iterative chan-
nel estimation and decoding for multi-path channels with RAKE
reception. 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 Turbo 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
conventional receiver.

  

Source: Ashikhmin, Alexei - Enabling Computing Technologies, Bell Laboratories

 

Collections: Engineering; Mathematics; Computer Technologies and Information Sciences