Wideband space-time coded systems with non-collocated antennas

In this paper we consider space-time coded wideband transmission from multiple base-stations. These systems can provide improved resistance to shadowing and extended range. An inherent challenge with these systems, however, is asynchronous reception of the signal elements. We describe three full space diversity approaches for wideband transmission from non-collocated antennas, with throughput, diversity, receiver-complexity trade-offs. Common to all systems are OFDM-type signaling, bit interleaved coded modulation, and iterative decoding. The lowest data-rate lowest complexity system employs an inner orthogonal spacetime block code with embedded OFDM transmission, while the highest data-rate highest complexity scheme does not employ an inner code. The latter scheme can provide even higher data rates at reduced space diversity.