Memory efficient multi-rate regular LDPC decoder for CMMB

• Published in: IEEE transactions on consumer electronics 2009-11, Vol.55 (4), p.1866-1874
• Main Authors: Lee, So-Jin, Park, Joo-Yul, Chung, Ki-Seok
• Format: Article
• Language: English
• Subjects: 4G mobile communication; China; Circuits; CMMB; CMOS; Decoders; Decoding; Density; Digital multimedia broadcasting; Electronics; Hardware design languages; Low Density Parity Check (LDPC) codes; Messages; Mobile communication; Multi-rate support; Multimedia; Multimedia communication; Parallel architectures; Parity check codes; Partially parallel decoder; Throughput; Tradeoffs
• ISSN: 0098-3063; 1558-4127
• DOI: 10.1109/TCE.2009.5373744

In this paper, we propose a memory efficient multi-rate Low Density Parity Check (LDPC) decoder for China Mobile Multimedia Broadcasting (CMMB). We find the best trade-off between the performance and the circuit area by designing a partially parallel decoder which is capable of passing multiple messages in parallel. By designing an efficient address generation unit (AGU) with an index matrix, we could reduce both the amount of memory requirement and the complexity of computation. The proposed regular LDPC decoder was designed in Verilog HDL and was synthesized by Synopsys¿ Design Compiler using Chartered 0.18 ¿m CMOS cell library. The synthesized design has the gate size of 455 K (in NAND2). For the two code rates supported by CMMB, the rate-1/2 decoder has a throughput of 14.32 Mbps, and the rate-3/4 decoder has a throughput of 26.97 Mbps. Compared with a conventional LDPC for CMMB, our proposed design requires only 0.39% of the memory.