FPGA Implementation of Eigenbeam MIMO-OFDM for Wireless LAN and Its Experimental Performance(<Special Section>Software Defined Radio Technology and Its Applications)

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This paper describes the experimental performance of eigenbeam multi-input multi-output with orthogonal frequency division multiplexing (MIMO-OFDM) systems as measured in a testbed implemented with field programmable gate arrays (FPGAs). The FPGA-testbed, characterized by the software-defined radio (SDR) technique, offers 1/5-scale real time signal processing. Extensive experiments on the testbed confirm the basic operation and performance of eigenbeam MIMO-OFDM with quadrature phase-shift keying (QPSK) and 16 quadrature amplitude modulation (QAM). From the packet error rate (PER) performance, we confirm that the eigenbeam 16QAM/MIMO-OFDM scheme with permutation matrix and three transmit antennas (M_t=3) drastically improves the required carrier-to-noise power ratio (CNR) by approximately 5.6dB over the scheme without eigenbeam with M_t=2. Furthermore, to determine the impact of Doppler frequency f_d, we focus on the transmission interval between the MIMO channel estimation and data transmission. To suppress the required CNR degradation to within 1.5dB, it is found that the eigenbeam 16QAM/MIMO-OFDM scheme with permutation matrix and M_t=3 permits a transmission interval of approximately 68.5ms when f_d=1Hz for a 1/5-scale model.
社団法人電子情報通信学会の論文
2006-12-01