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2005
IEEE

Low-power log-MAP turbo decoding based on reduced metric memory access

9 years 7 months ago
Low-power log-MAP turbo decoding based on reduced metric memory access
Due to the powerful error correcting performance, turbo codes have been adopted in many wireless communication standards. Although several low-power techniques have been proposed, power consumption is still a major issue to be solved in practical implementations. Since turbo decoding is classified as a memory-intensive algorithm, reducing memory accesses is crucial to achieve a low power design. To reduce the number of memory accesses for maximum a posteriori (MAP) decoding, this paper proposes an approximate reverse calculation of backward metrics which can be implemented with simple computational complexity. Simulation results show that the proposed method applied to W-CDMA standard reduces the access rate of the backward metric memory by 90% without degrading error correcting performance. A prototype turbo decoder based on the proposed reverse calculation achieves 30% power reduction compared to the conventional decoder.
Dong-Soo Lee, In-Cheol Park
Added 25 Jun 2010
Updated 25 Jun 2010
Type Conference
Year 2005
Where ISCAS
Authors Dong-Soo Lee, In-Cheol Park
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