MULTICARRIER 16QAM SYSTEM IN LAND MOBILE COMMUNICATIONS

The paper proposes a new multicarrier 16QAM system for high-quality an d high-bit-rate transmission with high spectral efficiency in land mob ile radio communications. The proposed system uses a multicarrier tran smission scheme to provide immunity against frequency-selective fading distortion. It also uses pilot-symbol-aided 16QAM to increase spectra l efficiency, and it combines space diversity and FEC with maximum lik elihood decoding to improve the bit error rate (BER) performance. Comp uter simulation shows that a BER of less than 10(-4) is obtained over frequency-selective fading channels with rms delay spread of less than 5.4 mus. Using a bandwidth of 200 kHz the proposed system can achieve high-quality transmission with a total information rate of 256 kbit/s .