Abstract
Feasibility study on a frequency transition of Field Pick-up Unit (FPU) system from 700MHz to 1.2GHz or 2.3GHz band is being carried out. In the past, the authors studied space-time trellis coded multiple-input multiple-output (STTC-MIMO) transmission technology for future 700MHz-band FPU system. 16QAM-STTC encoder and decoder were proposed, 2x2 STTC-MIMO-OFDM transmission equipment was developed and the performance was confirmed by outdoor transmission experiments. STTC-MIMO technology was thought to be valid in the new frequency band. In addition to 16QAM-STTC, QPSK-STTC and 8PSK-STTC were studied, and the QPSK-STTC was implemented into the hardware, while the demodulation method of the hardware was revised. Performance improvement due to these modification was verified by the quantitative evaluation using a channel simulator.
