Title :
Double-Binary Circular Turbo Decoding Based on Border Metric Encoding
Author :
Kim, Ji-Hoon ; Park, In-Cheol
Abstract :
This brief presents an energy-efficient soft-input soft-output (SISO) decoder based on border metric encoding, which is especially suitable for nonbinary circular turbo codes. In the proposed method, the size of the branch memory is reduced to half and the dummy calculation is removed at the cost of a small-sized memory that holds encoded border metrics. Due to the infrequent accesses to the border memory and its small size, the energy consumed for SISO decoding is reduced by 26.2%. Based on the proposed SISO decoder and the dedicated hardware interleaver, a double-binary tail-biting turbo decoder is designed for the WiMAX standard using a 0.18-mum CMOS process, which can support 24.26 Mbps at 200 MHz.
Keywords :
CMOS integrated circuits; IEEE standards; binary codes; broadband networks; decoding; low-power electronics; maximum likelihood estimation; CMOS process; WiMAX standard; bit rate 24.26 Mbit/s; border metric encoding; branch memory; dedicated hardware interleaver; double-binary circular turbo decoding; double-binary tail-biting turbo decoder; frequency 200 MHz; nonbinary circular turbo codes; size 0.18 micron; soft-input soft-output decoder; Bit error rate; Costs; Decoding; Encoding; Energy efficiency; Hardware; Land mobile radio; Signal to noise ratio; Turbo codes; WiMAX; Low power design; maximum a posteriori (MAP) algorithm; nonbinary turbo codes; turbo decoding;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2007.907803
