Collaborative communications using bit-Interleaved coded DPSK with cyclic delay diversity

We propose a new scheme for collaborative (or cooperative) communications using bit-Interleaved coded differential PSK with cyclic delay diversity in orthogonal frequency-division multiplexing (OFDM). bit-interleaved coded DPSK with cyclic delay diversity in OFDM can cope with the increased frequency selectivity, and enable picking up the spatial diversity in frequency-selectivity channels with unknown delay spread, conditioned on the minimum free distance d
_free
of the convolutional codes. Therefore, we show that our proposed collaborative technique can obtain an arbitrary number of diversity to d
_free
by transforming the spatial diversity into frequency diversity. Beside this scheme does not need channel estimation and recognition of the number of collaborative nodes.