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Lookup NU author(s): Dr Stephane Le Goff
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Turbo codes can achieve high coding gains close to the Shannon limit. For power and bandwidth-efficient coding schemes, several approaches combine high coding rate turbo codes with multilevel modulation. Such coding systems have been shown to display near-capacity performance over additive white Gaussian noise (AWGN) channels. For communications over fading channels requiring large coding gain and high bandwidth efficiency, it is also interesting to study the bit error rate (BER) performance of turbo codes combined with high order rectangular QAM modulation. We investigate the error performance of several bandwidth-efficient schemes designed using the bit-interleaved coded modulation (BITCM) approach. The structure of these coding schemes is presented in detail and their BER performance is investigated for spectral efficiencies ranging from 2 to 7 bit/s/Hz. Computer simulation results indicate that BITCM can achieve near-capacity performance over Rayleigh fading channels, for all spectral efficiencies considered. It is also shown that the combination of turbo coding and rectangular QAM modulation with Gray mapping inherently constitutes a very powerful association, since coding and modulation functions are both optimized for operation in the same signal-to-noise ratio region. This means that no BER improvement is obtainable by employing signal constellations other than the rectangular ones. Finally, the actual influence of the interleaving and mapping functions on error performance of BITCM schemes is discussed. (20 References).
Author(s): Le Goff SY
Publication type: Article
Publication status: Published
Journal: International Journal of Communication Systems
ISSN (print): 1074-5351
ISSN (electronic): 1099-1131
Publisher: John Wiley & Sons Ltd.
Notes: Publisher: Wiley, UK.
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