Title :
Energy-Efficient Double-Binary Tail-Biting Turbo Decoder Based on Border Metric Encoding
Author :
Kim, Ji-Hoon ; Park, In-Cheol
Author_Institution :
Dept. of EE, Korea Adv. Inst. of Sci. & Technol., Daejeon
Abstract :
This paper presents an energy-efficient turbo decoder based on border metric encoding, which is especially suitable for non-binary 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 small size and infrequent access to the border memory, power consumption for soft-input soft-output (SISO) decoding is reduced by 26.0%. Based on the proposed SISO decoder and the dedicated hardware interleaver, a double-binary tail-biting turbo decoder is designed for WiMAX standard using a 0.18 mum CMOS process and it can support 12.14Mbps at operating frequency of 100MHz.
Keywords :
CMOS integrated circuits; WiMax; codecs; low-power electronics; turbo codes; 0.18 micron; 100 MHz; 12.14 Mbit/s; CMOS process; WiMAX standard; border memory; border metric encoding; double-binary tail-biting turbo decoder; hardware interleaver; nonbinary circular turbo codes; soft-input soft-output decoding; CMOS process; Costs; Decoding; Encoding; Energy consumption; Energy efficiency; Frequency; Hardware; Turbo codes; WiMAX;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378416
