Abstract
Multicarrier and multiple transmit/receive antenna have become two key technologies underpinning most of the current development and research efforts towards ubiquitous high-throughput wireless communications. Both techniques can be used to increase the link throughput and/or to improve its robustness against channel fading and noise. This paper presents a unified bit error rate analysis for a particular flavour of multicarrier, namely, group-orthogonal code-division multiplex (GO-CDM), in combination with multiple Tx/Rx antennas. This system can be shown to encompass many of current wireless architectures and the analysis is general enough to incorporate the effects of channel frequency selectivity and Tx and/or Rx antenna correlation. The first main outcome of this paper is a general analytical framework suitable to study the effects of the different types of diversity in multicarrier systems. This analytical framework paves the way for the second main outcome of this study, namely, the design of effective reconfiguration strategies that serve to balance different system requirements (e.g., performance, complexity, delay). Particularly, it will be seen that the analytical results not only allows a-priori design decisions to be made, but it also provides an insight that enables the derivation of dynamic reconfiguration strategies that take into account instantaneous channel state information. The overall conclusion is that GO-CDM can play an important role in improving the performance of adaptive MIMO-OFDM systems.
Highlights
Most state-of-the-art wireless systems (e.g., IEEE 802.11n, IEEE 802.16m, 3GPP-LTE, LTE-Advanced) rely on a physical layer based on multicarrier multiantenna principles in trying to fulfill the stringent quality-of-service (QoS) requirements of modern multimedia applications
The combination of orthogonal frequency division multiplexing (OFDM) with multiple-input multipleoutput (MIMO) antenna configurations results in a powerful architecture, MIMO-OFDM, that is able to exploit the various degrees of freedom available in the wireless environment [1]
6 Numerical Results numerical results are presented with the objective of validating the analytical derivations introduced in previous sections and to highlight the benefits of the adaptive MIMO-group-orthogonal code-division multiplex (GO-CDM) architecture
Summary
Most state-of-the-art wireless systems (e.g., IEEE 802.11n, IEEE 802.16m, 3GPP-LTE, LTE-Advanced) rely on a physical layer based on multicarrier multiantenna principles in trying to fulfill the stringent quality-of-service (QoS) requirements of modern multimedia applications. The combination of orthogonal frequency division multiplexing (OFDM) with multiple-input multipleoutput (MIMO) antenna configurations results in a powerful architecture, MIMO-OFDM, that is able to exploit the various degrees of freedom available in the wireless environment [1]. A significant improvement over conventional OFDM was the introduction of multicarrier code division multiplex (MC-CDM) by Kaiser in [2]. Note that a GO-CDM setup can be seen as many independent MC-CDM systems of lower dimension operating in parallel. This reduced dimension allows the use of optimum receivers for each group based on maximum likelihood (ML) detection at a reasonable computational cost
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