Novel Detection Methods for Zero-padded Single Carrier Spatial Modulation in Doubly Selective Channels

In this paper, we present novel methods for signal detection in single carrier zero-padded spatial modulation under high mobility conditions. By expressing the doubly selective channel in terms of the basis expansion model (BEM), first a maximum likelihood (ML) method is presented as a processing framework. To reduce the complexity of the exhaustive ML search, two novel methods, respectively the BEM-based partial interference cancellation (BPIC) and BPIC with successive interference cancellation (BPIC-SIC), are then proposed. The complexity of the new methods are compared and their performance is evaluated by simulations in terms of bit error rate. The results indicate that the new schemes can remarkably improve the performance compared with the conventional methods.