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Paper Information

Journal:   SCIENTIA IRANICA   SUMMER 2004 , Volume 11 , Number 3; Page(s) 248 To 254.
 
Paper: 

ITERATIVE INTERFERENCE CANCELLATION FOR A CODED MULTICARRIER FREQUENCY-HOPPING CD MA (MC-FH-CDMA) SYSTEM

 
 
Author(s):  EBRAHIMI T.M., NASIRI KENARI M.
 
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Abstract: 

In this paper, a low complexity iterative multi-user receiver for the coded MC-FH-CDMA system, is considered, which has been introduced in [1]. The structure of the proposed receiver consists of a Multi-User Likelihood Calculator (MULe) and a bank of SISO channel decoders, one for each active user. Based on the received signal and a priori information about code bits, provided by 5150 decoders in the previous iteration, MULC computes the extrinsic information of the coded symbols of active users in the form of a Log-Likelihood Ratio (LLR). This information is used by channel decoders as a priori information to compute an update of LLRs. The processing proceeds in an iterative manner, similar to the decoding of turbo codes. The performance of the proposed receiver is evaluated in AWGN channels. The numerical results show that the new receiver significantly improves system performance, compared to the conventional single user receiver.

 
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