Authors: Xia Shao; Weidang Zhang; Ping Li
Addresses: Department of Information Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China ' School of Information Engineering, Zhengzhou University, Zhengzhou, 450001, China ' School of Information Engineering, Zhengzhou University, Zhengzhou, 450001, China
Abstract: Turbo codes have been shown to approach the Shannon limit for error correcting capability at low signal-to-noise ratios (SNR) given large sized frames. In standard turbo codes, all bits are transmitted with equal energy. Extensive research efforts have been examining ways to enhance the performance of turbo codes for short frames. One way is to optimise the energy allocated to each bit stream to achieve the best performance possible. In this paper, a novel scheme to improve the bit error rate (BER) performance of turbo codes with short frame size is presented. Theoretically, a formula is derived to optimise the bit energy and experimentally, an adjustable parameter is employed so that the proposed scheme can be used over a wide range of SNR. A case study verifies the efficiency of the scheme. It shows that the improvements of BER for turbo codes with short frame size are significant.
Keywords: channel coding; energy allocation; energy optimisation; turbo codes; signal-to-noise ratio; SNR; telecommunications; BER; bit error rate; short frames; optimisation.
International Journal of Information and Communication Technology, 2015 Vol.7 No.2/3, pp.316 - 323
Received: 14 Mar 2014
Accepted: 22 Jul 2014
Published online: 13 Mar 2015 *