Abstract
In recent years, MIMO technology has emerged as one of the technical breakthroughs in the field of wireless communications. Two famous MIMO techniques have become investigated thoroughly throughout the literature; Spatial Multiplexing, and Space Time Block Coding. On one hand, Spatial Multiplexing offers high data rates. On the other hand, Space Time Block Coding presents transmission fidelity. This imposes a fundamental tradeoff between capacity and reliability. Adaptive MIMO Switching schemes have been proposed to select the MIMO scheme that best fits the channel conditions. However, the switching schemes presented in the literature directly switch between the MIMO endpoints. In this paper, an adaptive MIMO system that incrementally switches from multiplexing towards diversity is proposed. The proposed scheme is referred to as incremental diversity and can be set to operate in two different modes; Rate-Adaptive, and Energy-Conservative Incremental Diversity. Results indicate that the proposed incremental diversity framework achieves transmission reliability offered by MIMO diversity, while maintaining a gradual increase in spectral efficiency (in the Rate-Adaptive mode) or a reduction in required number of received symbols (in the Energy-Conservative mode) with increase in the SNR.
Highlights
In recent years wireless communications have witnessed a rapid increase in the demand for capacity driven byHow to cite this paper: Elshabrawy, T. and Nafie, S. (2014) Incremental Diversity: A Framework for Rate-Adaptation/Energy-Conservation Enhancement in Multiple Input Multiple Output (MIMO) Systems
In the energy-conservative mode on the other hand, the results demonstrate that the proposed incremental diversity MIMO deployed within a broadcast communication environment has the potential to contribute to significant reduction in symbol-level reception energy requirements since each receiver has the ability to adapt the required number of symbols for decoding based on its instantaneous experienced Signal-to-Noise ratio
This means that higher order MIMO systems of 4 and 8 antennas are deployed with Hybrid Spatial Multiplexing (SM)/Space Time Block Coding (STBC) with 2 and 4 Alamouti STBC blocks, respectively
Summary
How to cite this paper: Elshabrawy, T. and Nafie, S. (2014) Incremental Diversity: A Framework for Rate-Adaptation/Energy-Conservation Enhancement in MIMO Systems. At a certain predefined outage probability, the scheme that renders higher spectral efficiency is chosen Another perspective is introduced in [8], where Hybrid SM/STBC is presented as a MIMO technology that combines SM and STBC, and compromises between the advantages of the two schemes. The proposed incremental diversity scheme can be set to operate in two different modes; Rate-Adaptive, and EnergyConservative. In the rate-adaptive mode, the results of [12] are extended to show that the proposed scheme enhances spectral efficiency while maintaining BER reliability under various MIMO configurations. In the energy-conservative mode on the other hand, the results demonstrate that the proposed incremental diversity MIMO deployed within a broadcast communication environment has the potential to contribute to significant reduction in symbol-level reception energy requirements since each receiver has the ability to adapt the required number of symbols for decoding based on its instantaneous experienced Signal-to-Noise ratio. ( )*, ( )T, and ( )H are used to denote the complex conjugate, transpose, and conjugate transpose, respectively
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