Compared with the traditional cellular network,Small Cell has strong line-of-sight(LOS)components caused by the shorter distance.The non-line-of-sight(NLOS)components in Small Cell will be much more complex,which needs frequent feedback,because of the increasing number of access points.The performance of traditional Rayleigh-based coordinated multipoint transmission(CoMP)precoding mechanism will become worse in Small Cell.Therefore,a Rician-based CoMP precoding codebook for Small Cell is proposed.It takes b...