Abstract—Multiple transmit and receive antenna systems have recently become of interest because it provides enormous capacity without any extra cost and power. Two practical techniques for space-time modulation are transmit diversity and spatial multiplexing. In this paper we propose switching condition for multiplexing or diversity suitable in frequency selective channels, by assuming finite length MMSE-DFE is using at the receiver for equalization. The decision is sent to transmitter via low feedback rate channel to switch between the diversity and multiplexing. Spatial multiplexing and space-time block code with two transmit two receive antennas on a typical urban COST-203 MIMO channel is taken as a case study for simulation.

Index Terms—MIMO, MMSE-DFE, Frequency selective channels, Alamouti code, Diversity.

The authors are with IIT Guwahati/ECE Dept., Guwahati, India(email:k.tadakamalla@iitg:ernet:in, kkishore@iitg:ernet:in).

Cite: Krishnaiah Tadakamalla and Kishore Kokkula, "Switching in MIMO-Frequency Selective Channels," International Journal of Computer and Electrical Engineering vol. 2, no. 4, pp. 613-616, 2010.