Design of 2x2 Mimo OFDM Architecture for Fixed WIMAX

Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing technology is an advanced transmission technique for wireless communication systems. In this paper, the 64 point pipeline FFT/IFFT processor is introduced for efficient implementation of OFDM architecture. The IFFT processor is used to modulate the subcarrier in transmitter section and FFT processor demodulate the subcarrier in receiver section in the architecture. Our design adopts a single-path delay feedback style requiring less memory space and reconfigurable complex constant multiplier and bit parallel multiplier used in pipeline FFT/IFFT processor, instead of using ROM’s to store twiddle factors that consuming lower power. The design of ROM-less FFT/IFFT processor is applied to OFDM architecture with different encoding and decoding techniques analysis in the IEEE 802.16d communication standard. The result shows overall architecture design using the ROM-less FFT/IFFT processor with convolutional encoding and decoding gives efficient power, area and timing specifications considerably. Keywords-MIMO, OFDM, FFT, IFFT.