Efficient two-stage frequency-domain equalisation for mitigating MAI in CDMA systems

Abstract

An efficient two-stage frequency-domain equalisation (TS-FDE) is proposed, in order to mitigate the effect of multiple access interference (MAI) in code division multiple access (CDMA) systems having no cyclic-prefix (CP). In TS-FDE, the first stage performs channel equalisation and signal detection. Utilising the detected signal and a channel response, the second stage constructs the circularity of a channel matrix for a received signal, and then it performs once more the channel equalisation like an FDE using the CP. The MAI mitigating capability of the TS-FDE is evaluated in a mobile channel.