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This paper presents a multi-mode decoder design for Quasi-Cyclic LDPC codes for Mobile WiMAX system. This chip can be operated in 19 kinds of modes specified in Mobile WiMAX system, including block sizes of 576,..., 2304. There are four proposed design techniques: reordering of the base matrix, overlapped operations of main computational units, early termination strategy and multi-mode design strategy...
This paper presents a LDPC decoder chip supporting all 19 modes in IEEE 802.16e system. An efficient design strategy is proposed to reduce 31.25% decoding latency, and enhance hardware utilization ratio from 50% to 75%. Besides, we propose an early termination scheme that can dynamically adjust the number of iterations. The multi-mode chip can be maximally measured at 83.3 MHz with only 52 mW power...
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