Improved three Dimensional Turbo Code using Superposition Modulation techniques: Extension to WiMAX system

Abstract

Communication systems need for regeneration of consistent information by controlling errors in a noisy environment. This is accomplished by incorporating suitable forward error correcting coding techniques into the system. In this context, Turbo Code (TC) is regarded as one of the high-performance forward error correcting codes whose BER performances tends to the “Shannon limit”. An advanced form of Turbo Code (TC) named as 3-Dimensional Turbo Code (3D-TC) has been appeared as a thought-provoking investigation zone in recent past. Meanwhile an exhaustive research has been carried out on Superposition Modulation (SM) techniques in which switching from bit to symbols is occurred using non-bijective mapping method. Considering the above facts, a novel SM based 3D-TC has been suggested in this paper to enrich the Bit Error Rate (BER) act ominously by choosing right combination of generator polynomial for each constituent encoder as well as interleavers. The effectiveness of the projected code has also been evaluated by comparing its BER performance with other existing codes in WiMAX system under different fading channel conditions.