Performance Analysis on Adaptive Modulation-based BLAST Systems with Queuing Model

Abstract

In this paper, we analyze the performance of adaptive modulation-based Bell-labs layered space-time systems with finite-length queuing model. Since the thresholds values for the adaptive modulation scheme should be optimized when the queuing model is taken into account in the system, cross-layer performance analysis on the queuing behavior is necessary. The most important contribution of our work is to express the service rate distribution of adaptive modulation-based BLAST system in closed form. Moreover, from discrete Markov chain analysis, we obtain the performance of the queuing model such as overall packet error rate and average queuing delay. Then, we discuss three applications of the accurate numerical results in cross-layer designs. The accuracy of the numerical results is verified by Monte Carlo simulations.

Performance analysis of a Multiuser Multi-Packet Transmission system for WLANs in non-saturation conditions

“…In [5], the authors present a point-to-point MIMO system, considering both transmit diversity (STBC) and spatial multiplexing (BLAST) schemes for a single-user MPT. A similar work that overcomes the approximation done in [5] for the BLAST scenario is presented in [6], although the presented results are only valid for two antennas. To the best of our knowledge, [7] is the only work where a detailed queueing model for Multiuser MPT systems is presented.…”

“…for any k, where q k and q k−1 are related according to the recursion in (6). As it can be seen in the recursion, p i,j not only depends on the size of the transmitted space-batch, but also on the time it takes to transmit the corresponding frame, which depends on the chosen rate r, which in turn depends on S, the composition of the space-batch.…”