PREDICTIVE ANTENNA SELECTION DIVERSITY (PASD) FOR TDMA MOBILE RADIO

Antenna selection diversity is an effective method to achieve both better transmission performance and compact circuit implementation in TDMA portable radio communications. However, diversity performance in fast fading environments is insufficient. This paper proposes a novel predictive antenna selection diversity scheme, PASD, which improves the diversity performance for higher fading rates. In PASD, received signal power for the assigned data slot is predicted from previously measured data. Thus, selection errors due to the receiving power changes caused by fast Rayleigh fading can be effectively avoided. An experimental result for a 3-ch TDMA system with a frame duration of 20 ms shows that the diversity gain was increased by 1.3 dB over the conventional method for a fading rate of 40 Hz. PASD is also shown to have improved diversity performance against cochannel interference.