Abstract
This chapter focuses on signaling techniques in Multiple-Input Multiple-Output (MIMO) frequency selective channels, covering both single-carrier and multi-carrier transmissions. It addresses the mutual information, the error probability, and the code design. It considers slow-fading channels (the channel is constant over each frame) and the delay-sampled frequency selective representation, which is the combination of L flat fading taps. There are basically two different approaches to transmit information over frequency selective MIMO channels. The first one involves modulating a single carrier over the full bandwidth B (MIMO-SC), whereas the second approach converts the frequency selective channel into a set of multiple parallel flat fading channels in the frequency domain. This is realized by means of orthogonal frequency division multiplexing (OFDM) modulation and is then referred to as MIMO-OFDM.
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