Abstract
In this study, a theoretical foundation is built to evaluate the downlink performance of an MC-CDMA cellular system with site diversity operation with and receive antenna diversity combining. An expression for the theoretical conditional bit error rate (BER) for the given set of channel gains is derived based on Gaussian approximation of the interference components in the composite receive signal. The local average BER is then obtained by averaging the conditional BER over the given set of channel gains using Monte-Carlo numerical method. The outage probability is measured from the numerically obtained cumulative distribution of the local average BER to determine the downlink capacity. Results from theoretical computation are compared to the results from computer simulation and discussed.
Highlights
The multicarrier-CDMA (MC-CDMA)[1,2] has been considered as a wireless access candidate for a wideband downlink transmission due to its robustness against the frequency-selectivity of the multipath channel and high frequency efficiency [3,4,5]
The theoretical treatment was developed for the downlink site diversity reception with joint use of MMSE-frequency-domain equalization (FDE) and antenna diversity in a cellular MCCDMA system
The expressions for the conditional SINR and bit error rate (BER) were derived based on Gaussian approximation of the interference components; and the local average BER was numerically computed using Monte-Carlo computation method
Summary
The multicarrier-CDMA (MC-CDMA)[1,2] has been considered as a wireless access candidate for a wideband downlink transmission due to its robustness against the frequency-selectivity of the multipath channel and high frequency efficiency [3,4,5]. It is one of the new multiple access techniques proposed which based on the combination of the OFDM and CDMA. B)Each data stream is serial-parallel converted before spreading to obtain almost frequency non-selective fading for each subcarrier (see Figure 2). The FDE[12,13] and antenna diversity[14,15] are discussed
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