Recent Progress in Interleave-Division Multiple-Access (IDMA)

In this paper, we outline several new developments related to interleave-division multiple-access (IDMA). Our discussion encompasses analysis and optimization techniques, superposition-coded modulation, frequency domain processing schemes and the applications of IDMA in multiple-input multiple-output, relay and ad hoc environments. We demonstrate the flexibility and robustness provided by IDMA. We show that the IDMA principle can be applied to realize many potential performance gains highlighted by information theory, including coding gain, diversity gain and multi-user gain. We demonstrate that these gains can be very high, ranging from a few to tens of dBs, compared with conventional approaches.