Decreasing the BER of turbo codes with short frame by optimising the energy allocation Online publication date: Wed, 01-Apr-2015
by Xia Shao; Weidang Zhang; Ping Li
International Journal of Information and Communication Technology (IJICT), Vol. 7, No. 2/3, 2015
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.
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