A fast multispeed comma-free Reed-Solomon decoder for W-CDMA applications using foldable systolic array architecture

This brief proposes a fast multispeed comma-free Reed-Solomon (CFRS) decoder for the frame synchronization and code-group identification in the cell search of the Third Generation Partnership Project wide-band code-division multiple access/frequency division duplexing (W-CDMA/FDD) system. A foldable systolic array is proposed to achieve fast decoding and provide flexible tradeoffs between power consumption, chip size, and decoding latency. Multispeed decoding, an idea that is useful for cell search in different application scenarios, can also be achieved with the same array architecture. The proposed CFRS decoder is implemented in a 3.3-V 0.35-μm CMOS technology with 2.2 × 2.2 mm² core area and power dissipation of 13.3 and 1.23 mW in high- and low-speed decoding modes, respectively.