摘要
RA码的译码通常是利用BP译码算法来实现的,但是BP译码算法的硬件电路复杂。虽然最小和译码算法能够简化BP译码算法,但它是以牺牲性能为代价的。为了让译码算法在复杂度和译码性能之间取得较好的折衷,提出一种改进型RA译码算法。该算法采用偏移量近似的方法来逼近于BP译码算法,能够降低BP译码算法的复杂度。仿真结果表明,与BP译码算法相比,改进型RA译码算法能够在降低算法复杂度的同时保持良好的译码性能,与最小和译码算法相比,改进型RA译码算法的复杂度几乎不变,但译码性能得到了明显的提高。
BP decoding algorithm is usually used to realize decoding of RA codes, but the hardware circuit of BP decoding decoding algorithm, b algorithm is complicated. Minimum-sum decoding algorithm can simplify BP ut it is achieved by sacrificing performance. A modified RA decoding algorithm is proposed in order to have a good tradeoff between complexity and decoding performance. The proposed algorithm is approximate to BP decoding algorithm by the method of offset approximation, which can decrease the complexity of BP decoding algorithm. The simulation results show that, compared with BP decoding algorithm, the modified RA decoding algorithm can decrease algorithm complexity and keep good decoding performance. Compared with minimum-sum decoding algorithm, the complexity of modified RA decoding algorithm is almost unchanged, but the decoding performance improves significantly.
出处
《长春工业大学学报》
CAS
2009年第4期390-395,共6页
Journal of Changchun University of Technology
