Performance of cyclic delay diversity in Riceanan channels

Abstract Cyclic delay diversity (CDD) provides additional diversity in Rayleigh fading channels, and therefore, improves system performance. For line-of-sight (LOS) propagation, e.g. the additive white Gaussian noise channel, the implementa-tion of CDD yields to a performance loss. Therefore, we investigate CDD for Ricean channels with different Ricean factors. To combat the SNR loss for sig-nificant LOS propagation we propose the principle of antenna power weighting. The idea is to feed different power levels into the multiple transmit (TX) an-tenna branches rather than distributing the TX power uniformly among the TX-antennas. We exemplarily implement CDD with antenna power weighting to the terrestrial digital video broadcasting system (DVB-T). Simulation results show that antenna power weighting significantly reduces the SNR loss in LOS propa-gation by the cost of a slight degradation of the SNR gain in non-LOS scenarios. 1