Transmit diversity applied on the CDMA/TDD cellular systems

Abstract

This paper shows that the result of cell search and open loop transmit divesty of CDMA/TDD. The TSTD type transmit diversity for the physical synchronisation channel (PSCH) can shorten the cell search time of user equipment (UE) at low Doppler frequency. The block STTD type transmit diversity for the primary common control channel (P-CCPCH) can improve the BER performance around 3 dB compared with a single antenna transmission. Furthermore the authors propose open loop type sector/cell selection handover. The improvement by using this scheme, as compared to hard handover, is almost 2 dB for between sectors and 1.1 dB to 1.6 dB for between cells, depending on the Doppler frequency. The change for the switching rate into 10 ms makes the gain of 0.8 dB at f/sub D/=53 Hz and 1.7 dB at f/sub D/=222 Hz, respectively.