Performance of precoding techniques in LTE

Codebook based precoding is a limited feedback structure and promising technology adopted by Long Term Evolution (LTE) which is proposed by 3GPP (Third Generation Partnership Project). An important feature of LTE systems is the MIMO mode, which is used to achieve higher spectral efficiency. Precoding is used in certain MIMO modes to improve performance. This paper presents the precoding techniques namely per-subcarrier, sub-band and wide-band precoding, the precoding matrix selection based on the post processing SNR and presents some comparison of precoding SNR Gain for wide-band, sub-band and per subcarrier precoding with that of non precoding case (NPC).