Dual input radix 2³ SDF IFFT/FFT processor for wireless multi-channel real sound speakers using time division duplex scheme

There has been an increased demand for realistic audio services because of the recent developments in multimedia techniques and contents. In addition, the rapid growth in wireless communications has brought about a new era of wireless multimedia applications and services such as the transmission of video, images, and data over wireless broadband access networks. Accordingly, orthogonal frequency division multiple access (OFDMA) modulation technique based on time division duplex (TDD) scheme is an attractive wireless communication technology for high data rate wireless access with multi-channel real sound system. For modulation and de-modulation of the OFDMA, inverse fast Fourier transform (IFFT) and FFT processor are used and these are most energy consuming operation in OFDMA communication systems. In this paper, we proposed a two input radix 2³ single delay feedback (TIR2³SDF) method to simultaneously use the IFFT and FFT in one FFT processor. We also described the architectures and the control signals for the proposed TIR2³SDF. The experimental results show that the FFT processor based on proposed TIR2³SDF reduce about 43.3% of the hardware complexity in the FPGA implementation.