Design of a high-spectral-efficiency MIMO MB-OFDM UWB baseband transceiver

A multiple-input multiple-output (MIMO) baseband transceiver for multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) communications is proposed in the paper. In the transceiver, a spatial multiplexing scheme with four transmit and four receive antennas is utilized to increase spectrum efficiency and achieve 1.92-Gbps data rate. Performance of both the MIMO and single-input single-output (SISO) schemes is investigated through simulations under additive white Gaussian noise (AWGN), 40-ppm carrier frequency offset (CFO), 40-ppm sampling frequency offset (SFO), and the revision Saleh-Valenzuela (S-V) channel models. Simulation results show that at 10^-3 bit-error rate (BER), the MIMO design outperforms the SISO system for more than 2 dB under CM1 channel. Under channel effects with more serious fading, such as CM2 and CM3, the performance gain between MIMO and SISO systems can be even more than 5 dB. It is shown that the MIMO MB-OFDM UWB design provides four times of data rate and better error performance, compared with the conventional SISO scheme.