Low density parity check (LOPC) code is an error correct code that can achieve performance close to Shannon limit and it is widely adopted in communication systems such as WiMAX and Wi-Fi. This paper presents a design of a flexible LDPC decoder for WiMAX based on the NoC platform. The implementation adopts layered decoding algorithm and exploits high parallelism that lies in the algorithm. Considering large quantity of data exchange between cores, we use stepped data exchange strategy and master-slave structure to reduce communication cost. The Cycle accurate simulation results show high speed-up and scalability of code rate of 5/6 with different code length in WiMAX in 4/8/16 processor systems.
This paper proposed a 2-D electrocardiogram (ECG) compression core based on no list set partitioning in hierarchical trees (NLSPIHT) algorithm. The hardware solution presented here exploits the fact that ECG signals generally reveal both spatial and temporal redundancy. In order to reduce hardware cost, tiling approach is adopted to implement efficient low-cost circuits. Evaluated in SMIC 65-nm process, the 7 kHz compressor with 64 X 64 tile draws only 12.9-,uW, which is more favorably in portable battery-driven biomedical devices. In addition, the compression performance is maintained compared to similar 2-D compression algorithm in software.
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