Performance analysis of OFCDM in SUI channels

Advancements in the technology of multimedia and mobile communication system demands high data rate transmission especially in the downlink. OFDM provides the high data rate transmission with simple detection scheme but it does not provide frequency diversity. CDMA provides frequency diversity but it is not suitable in multipath interference. Orthogonal frequency and code division multiplexing (OFCDM) is getting popular transmission technique due to some of its advantages over OFDM and CDMA. It provides spreading in time and frequency domain which increases the symbols redundancy, hence increase in reliability. It also provides variable transmission rates by employing variable spreading factor (VSF) in frequency and time domain spreading. This paper presents the performance analysis of OFCDM for fixed wireless applications. Performance in term of bit error rate (BER) is compared between OFCDM and OFDM in six SUI channels. The analytical BER results show that OFCDM has performed much better than OFDM in all SUI channels. The equalizer at the receiver is characterized by zero forcing technique without multi-code interference (MCI) cancellation. So results will be obtained in worst case scenario in the presence noise and MCI.