Joint Receivers for Multiuser MIMO Wireless Communications

In order to achieve high throughput requirements of next-generation communication systems, Multiple-Input Multiple-Output (MIMO) technology should be employed. Generalized Frequency Division Multiplexing (GFDM) signal has lower Out-Of-Band (OOB) emission and peak-to-average power ratio and can be used for next-generation communications. But the pulse shaping filter used by GFDM will cause Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI). In this paper, we propose low-complexity joint receivers to suppress ISI, ICI and multi-user interference (MUI) for multi-user MIMO-GFDM uplink communication. The traditional solution is to design the equalizer and the GFDM demodulation separately, but this paper deals with the two parts together to reduce the complexity initially. The complexity of the preliminary joint receiver is still not low enough, so we derive two closed-form expressions for the low-complexity joint receivers, which not only greatly reduces the complexity, but also achieves the optimal error rate performance. Some simulation examples are given to demonstrate the effectiveness of the proposed low-complexity multi-user MIMO-GFDM receivers.