Simplified joint detection in the frequency domain for the uplinkWPAN MC-CDMA system on MMW band

In an indoor mm-wave propagation environment, although the channel is time-invariant for a long time, the requirement of very high data rate makes the system design a hard mission and the severe MAI caused by asynchronous users in the uplink makes it worse. Although the MC-CDMA system for WPAN applications, on a 62.5 GHz carrier frequency, performs well for the single user scenario, it is very sensitive to MAI. We consider the adoption of joint detection (JD) to improve the BER performance. However, traditional JD, realized in the time domain, is too complicated to implement. Therefore, we proposed a simplified JD in the frequency domain, based on the specific characteristics of the MC-CDMA system matrix. Computer simulation results show that the JD MMSE-BLE scheme outperforms all the other data detection methods, especially for heavy system load with very low spreading factor and is realizable due to much less complexity compared with that of JD in the time domain.