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Proceedings of 2009 Conference onCommunication Faculity (PCCF 2009 E-BOOK)

Nan'ning,China,9.18-9.20,2009

ISBN: 978-1-935068-06-8 Scientific Research Publishing, USA

E-Book 712pp Pub. Date: December 2009

Category: Engineering

Price: $100

Title: Bit Error Rate of OFDM-IDMA System with ARQ
Source: Proceedings of 2009 Conference onCommunication Faculity (PCCF 2009 E-BOOK) (pp 509-512)
Author(s): Shanfeng Sheng, Zhejiang Gongshang University, Hangzhou, China,
Xiaoyu Chen, Zhejiang Gongshang University, Hangzhou, China,
Abstract: Orthogonal frequency division multiplexing (OFDM) is a simple mean to mitigate the inter-symbol interference and the narrow-band interference due to multi-path propagation. It enhances the capacity of the system effectively. The interleave-division multiple-access (IDMA) can be applied to multi-carrier systems to improve spectrum efficiency apparently. Auto repeat request (ARQ) is a usual method of reliable communication in noisy channel by controlling the transmission errors. Combining OFDM and IDMA technologies, the spectrum efficiency of the system can be greatly improved subjected to little increment of computational complexity. Bit error rate of multi-path systems can be effectively reduced by introducing iteration at the end of receiving. We propose an ARQ-OFDM-IDMA system, simulate the system in AWGN channel and Rayleigh channel environments. The bit error rates with respect to noise level are compared over these channels with different number of users. The simulation results show that: The transmission bit error rate of ARQ-OFDM-IDMA systems is less than that of OFDM-IDMA system under the same channel conditions.
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