Performance analysis of CDMA Spreading codes for LTE/MIMO

Abstract

The key technologies of 4G/LTE are OFDM and CDMA. Predefined precoding codebook defined by 3GPP for LTE is a promising technique with limited feedback from the receiver. Multipath problem and interference at the UE and eNB are the major problems of cellular communication. WHT, Kasami and gold sequences are CDMA code sets used to mitigate MAI and multipath problems. This paper combines mode 2Precoding transmission mode of LTE with CDMA code sets in frequency domain. WHT lowers interference in uplink transmission whereas Kasami and Gold sequences give good results in downlink transmission. In this paper BER of WHT, Kasami and Gold sequences with precoding are compared and graphs are plotted.