Full-rate full-diversity differential MIMO

Differential multiple input multiple output (MIMO) enables communication without the need for channel estimation and the associated overhead due to the transmission of pilots. A number of differential MIMO techniques were proposed using unitary or orthogonal space-time codes. These codes provide full diversity but achieve a data rate of no more than one symbol per channel use. This paper presents a block differential MIMO technique which can use any non-orthogonal full-rate full-diversity space-time code. This approach has a decoding complexity comparable to that of coherent MIMO.