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In this paper, a millimeter wave 2×2 MIMO (Multiple-Input Multiple-Output) six-port based architecture is proposed and analyzed. This line-of-sight MIMO configuration doubles the data rate without increasing channel bandwidth and exploits spatial diversity. In the system analysis, two pseudo-random BPSK signals of 2 Gb/s data rate are transmitted on two MIMO orthogonal channels. The inherent MIMO...
In this paper, a millimeter wave 2×2 MIMO (Multiple-Input Multiple-Output) six-port based architecture is proposed and analyzed. This line-of-sight MIMO configuration doubles the data rate without increasing channel bandwidth and exploits spatial diversity. In the system analysis, two pseudo-random BPSK signals of 2 Gb/s data rate are transmitted on two MIMO orthogonal channels. The inherent MIMO...
In this study, the authors provide an analytical framework to assess network-level quality of service (QoS) measures for differentiated, non-saturated traffic in infrastructure-mode 802.11 wireless local area networks using the distributed coordination function access mechanism. The authors build on a general analytical framework that takes into account the medium access control (MAC) access mechanism,...
MISO-OFDM systems enable the allocation of resources in the frequency and spatial domain to increase the data throughput of wireless systems. In this paper, we initially present a near-optimal solution to the MISO-OFDM Resource Allocation (RA) problem. This solution performs an exhaustive search over all possible user sets and then uses a dual-based approach to optimally assign power to the selected...
In this paper, we analyze a multiple-input multiple-output (MIMO) wireless system with dynamic radiation pattern diversity provided by composite right/left-handed (CRLH) leaky-wave antennas (LWA's). The CRLH-LWA is electronically reconfigurable with real time continuously direction-steerable radiation pattern and adjustable beamwidth. Analysis shows that these features match the clustered nature of...
In this paper, we consider a class of wireless ad hoc networks, namely two-hop MIMO interference relay network, where L M-antenna source-destination pairs communicate via K relay nodes each equipped with N antennas. Based on recent advances on characterizing the limits of MIMO X channel and the concept of interference alignment, we treat this network as the cascade of two MIMO X networks and decompose...
In this paper, we evaluate the impact of the wireless channel and physical layer parameters on the performance of VoIP traffic in IEEE 802.11g networks. The wireless channel is modeled using a finite state Markov chain based on an adaptive modulation and coding scheme. The transition probabilities encompass the effects of the time-varying wireless channel, such as the Doppler frequency and the operating...
User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains. However, the optimal degree of cooperation between the users changes with the channel conditions and...
User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains. However, the optimal degree of cooperation between the users changes with the channel conditions and...
The convergence of different classes of traffic with different priorities over the wireless network has become a reality. To insure that the users of key applications such as VoIP are satisfied with the service they receive, one must insure that the QoS criteria for these applications, such as delay, jitter or packet loss, are met This in turn means that some form of connection admission control must...
In this paper we consider a two-hop MIMO parallel relay channel where a source-destination pair both equipped with M antennas, communicate via K N-antenna half-duplex amplify-and-forward relays (K,N ges M). Multi-user beamforming techniques are jointly applied at the source and destination to respectively multiplex and recover the data streams. In order to further exploit the multi-relay diversity,...
This paper presents a dynamic radiation pattern diversity (DRPD) MIMO wireless system where the antennas radiation patterns are electronically controlled in real-time. The adopted antenna elements are composite right/left-handed (CRLH) microstrip leaky-wave (LW) antennas for which the beam direction can be electronically scanned in a continuous manner from backfire to endfire and the beam shape can...
A significant amount of work has been carried out on the application of six-port receivers for single carrier communications and for the impulse ultra-wideband radio, however a small interest has been shown on the research of its use for orthogonal frequency division multiplexing (OFDM) communication systems. OFDM and its derived forms are now essential multi-carrier modulation techniques for various...
A MIMO OFDM receiver with interference cancellation requires a channel estimation and matrix inversion on a sub-carrier basis. This is computationally intensive and can prevent a practical implementation. In this paper, we propose new interpolation algorithms for this type of receiver. To eliminate the need for a matrix inversion for each OFDM sub-carrier, the weight matrix is interpolated. Algorithms...
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