DefinePK

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is digital multi-carrier modulation technique which divides the whole channel into several orthogonal sub- channels. OFDM transmits a high data rate signal and offers high frequency efficiency, helps to increase robustness against Inter Symbol Interference (ISI) and fading caused by multi- path propagation. OFDM is chosen as air interface technique for LTE and it has high sensitivity. CA (Carrier Aggregation) is defined by 3GPP (the 3rd Generation Partnership Project) to support wide-bandwidth transmission. Carrier Frequency Offset (CFO) and Sampling Time Offset (STO) is a challenging problem in OFDM. Non continuous CA scenario’s synchronization problem is addressed and CAZAC algorithm is proposed to suppress synchronization error, STO (Sampling Time Offset) and CFO (Carrier Frequency Offset). Precoder design is used to improve BER (Bit Error Rate) performance and to minimize the MSE (Mean Square Error Value).