Far East Journal of Electronics and Communications
-->
Abstract: This paper proposes decoding methods for
non-systematic convolutional codes by using sum-product algorithm (SPA). For
these codes, the conventional SPA decoding cannot provide good decoding
performance. To improve the SPA decoding performance, this paper proposes
two-step SPA decoding method (Proposed Method 1: PM1). The PM1 is as follows:
(1) Only parity bits are decoded by SPA. (2) With decodedparity bits, information bits are regenerated. Furthermore, this
paper proposes the combined use of PM1 and method with higher degree parity
check equation (Proposed Method 2: PM2). The PM2 provides good performance near
BCJR performance. At PM2
performance is only 0.7 [dB] inferior to BCJR performance. Complexity for PM2 is
times of
that for BCJR algorithm.
Keywords and phrases: sum-product algorithm, non-systematic convolutional codes, wireless local area network, high speed decoder.
