scholarly journals Interleaving Gains for Receive Diversity Schemes of Distributed Turbo Codes in Wireless Half–Duplex Relay Channels

2015 ◽  
Vol 24 (2) ◽  
pp. 481-488 ◽  
Author(s):  
Tamer H. M. Soliman ◽  
Fengfan Yang ◽  
S. Ejaz
Keyword(s):  
Turbo Codes ◽  
Relay Channels ◽  
Receive Diversity ◽  
Half Duplex

Turbo Codes with Modified Code Matched Interleaver for Coded-Cooperation in Half-Duplex Wireless Relay Networks

Frequenz ◽  
2015 ◽  
Vol 69 (3-4) ◽  
Author(s):  
Saqib Ejaz ◽  
Feng-Fan Yang
Keyword(s):  
Turbo Codes ◽  
Rayleigh Fading ◽  
Turbo Code ◽  
Half Duplex ◽  
Constraint Length ◽  
Wireless Relay ◽  
Overall Performance ◽  
Coded Cooperation ◽  
The Impact ◽  
Parallel Encoding

AbstractThe parallel encoding and decoding structure of turbo codes makes them natural candidate for coded-cooperative scenarios. In this paper, we focus on one of the key components of turbo codes i.e., interleaver, and analyze its effect on the performance of coded-cooperative communication. The impact of an interleaver on the overall performance of cooperative systems depends on the type of an interleaver and its location in the cooperative encoding scheme. We consider code matched interleaver (CMI) as an optimum choice and present its role in a coded-cooperation scenario. The search and convergence of CMI for long interleaver sizes is an issue; therefore, a modification in the search conditions is included without any compromise on the performance of CMI. We also present analytical method to determine maximum S-constraint length for a CMI design. Further, we analyze the performance of two different encoding schemes of turbo codes, i.e., distributed turbo code (DTC) and distributed multiple turbo code (DMTC) after inclusion of CMI. Monte Carlo simulations show that CMI increases the diversity gain relative to other conventional interleavers such as uniform random interleaver. The channel is assumed to be Rayleigh fading among all communication nodes.

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