High-Throughput, power-efficient, coefficient-free and reconfigurable green design for recursive DFT in a portable DRM receiver

This paper presents a green design of fast recursive discrete Fourier transform (RDFT) for application to a portable DRM receiver. The proposed design has high-throughput, power-efficient, coefficient-free and reconfigurable advantages. For an audio decoder in a DRM receiver, the most computational complexity block, IMDCT algorithm, can be employed in a single hardware accelerator through this RDFT kernel to share hardware resources. Hence, the proposed design would greatly reduce the hardware costs for the realization of a portable DRM receiver. Not only do the proposed algorithms have 4 times the data throughput per transformation (DTPT) compared with the latest Lai et al. 's RDFT, but it also requires only 49.5% of computational cycles for computing all output sequences. The proposed RDFT algorithms can reduce the number of additions and multiplications by 47.5 % and 48.7%, respectively. In addition, the number of the coefficient requirements for storing cosine and sine functions can be greatly reduced by 100%. Furthermore, we realize this RDFT processor by using TMSC 0.18um 1P6M CMOS technology. The core size is 871 857 um ² and the power consumption is 14.3mW @ 25MHz. Thus, the proposed design would be more efficient and more suitable than previous works for DRM applications.