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The combined MIMO with Adaptive Modulation and Coding (AMC) technology can provide high spectral efficiency and link robustness. Moreover, the diversity-multiplexing trade-off of MIMO systems motivates the design of adaptive algorithms that switch between the two approaches to enhance performance. While most existing adaptive algorithms focus on physical layer, the QoS requirements of multimedia services are mainly parameters in link layer. Hence, cross-layer analysis on the queuing behavior of MIMO-AMC systems is necessary, but remains open. In this paper, under the conditions of unsaturated traffic and finite-length buffer, the authors investigate the queuing characters of two representative categories of MIMO systems, namely the BLAST system and the Space-Time Block Coding (STBC) system.
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