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This paper presents the strategy of combining antenna selection with an adaptive modulation scheme for Multiple Output (MIMO) systems. The proposed scheme maximized the Average Spectral Efficincy (ASE) with a constant power for a given Bit Rate (BER) Constraint. This system provided the advantages of both antenna selection and adaptive modulation technique Also due to the practical system cannot estimates...
A DC offset compensated variable rate variable power (VRVP) adaptive modulation (AM) MIMO system with perfect channel state information is introduced. By this approach, BER degradation of AM MIMO due to DC offset is removed considerably. This technique provides a good trade-off between BER and average spectral efficiency (ASE) and increases the robustness of the system relative to DC offset.
The effect of DC offset on multi-input multi-output (MIMO) direct transceivers with adaptive modulation (AM) is discussed in this paper. A variable-rate variable-power (VRVP) AM system with perfect channel state information (P-CSI) at both the transmitter and receiver in a MIMO scenario is considered. The DC offset is modeled as a zero mean complex Gaussian distributed random variable. By this modeling...
In this paper we introduce an effective bandwidth- based Call Admission Control (CAC) with adaptive modulation technique to manage the traffic in a wireless IP-based network. Since the next generation of communication networks will carry different classes of traffic, e.g., voice, video, fax, data and multimedia, over the same network and these different classes of traffic usually require different...
A cross layer approach based on adaptive modulation (AM) at the physical layer and truncated automatic repeat request (ARQ) protocol at the data link layer has been presented. To realize the system the MIMO channel is decomposed into single-input single-output (SISO) channels, then the probability density function in these sub-channels is extracted and approximated by Gamma distribution. An upper...
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