Год выпуска: 2010 Автор: Vidhyacharan Bhaskar Издательство: LAP Lambert Academic Publishing Страниц: 160 ISBN: 9783843374521
Описание
This dissertation incorporates rate adaptation schemes for direct sequence spread spectrum systems. Subspace and pilot-aided methods for channel estimation can be used to estimate the nature of time varying channels. The simulated performance of punctured and repetition codes agrees well with the upper and lower theoretical bounds in hard-decision decoding over Rayleigh and Rician fading channels. The expression for the upper bound on soft-decision decoding is also derived and plotted. An adaptive forward error correction (FEC) coding scheme is proposed to combat the detrimental effects of fading in a mobile multiuser environment. The throughput of the proposed adaptive FEC scheme reaches the highest code rate of the punctured convolutional code used. The throughput of the proposed hybrid automatic repeat request (H-ARQ) scheme exceeds that of the generalized H-ARQ scheme for high signal to noise ratios.
