In this paper, we present a nonuniform quantizer based on the condition of maximum information rate achieved over uncorrelated Rayleigh fading channel and when successive cancellation (SC) decoding algorithm of polar codes is applied. Based on symmetry condition of random variables, we start with theoretical model where uniform scaling factors are applied to correct soft messages at the absence of channel state information (CSI) at the receiver side. The searching method followed to find the required optimal factor stayed away from using exhaustive search methods. Numerical results show how non-uniform quantized polar decoder is capable to perform performance close to floating point performance.

Additional Metadata
Keywords Log-likelihood ratio (LLR) approximation, Non-uniform quantization, Polar codes, Uncorrelated Rayliegh fading
Persistent URL dx.doi.org/10.1109/IEMCON.2017.8117162
Conference 8th IEEE Annual Information Technology, Electronics and Mobile Communication Conference, IEMCON 2017
Citation
Hasan, A.A. (Alaa A.), & Marsland, I. (2017). Non-uniform quantizers with SC polar based channel-optimized decoders. In 2017 8th IEEE Annual Information Technology, Electronics and Mobile Communication Conference, IEMCON 2017 (pp. 101–104). doi:10.1109/IEMCON.2017.8117162