MIMO and Spread Spectrum Systems
MIMO (multiple-input, multiple-output) wireless techniques have been shown to allow dramatic increases in the efficiency of the use of the radio spectrum, by a factor of ten or more.
They are set to play a major role in future wireless systems, including future developments of third generation mobile systems, enhanced wireless LAN (WiFi) systems, and the potential fourth generation "gigabit wireless" systems.
Research at York includes the development of techniques to achieve the capacities theoretically available, as well as to evaluate their performance in realistic environments, particularly with OFDM modulation schemes.
Practical implementation also depends on the antenna elements, and here joint research with the Applied Electromagnetics Group is developing and evaluating new antennas for use on small terminals such as PDAs.
However the implementation of true MIMO using multiple antennas on small devices may not always be practical due to the size of these devices. Cooperative diversity is a way to provide the benefits of diversity without requiring multiple antennas per terminal, by allowing surrounding terminals to collaborate, acting as a virtual MIMO antenna array.
We are investigating several practical aspects of this technique, while also looking at the use of similar cooperative relaying techniques to new network architectures such as wireless mesh and sensor networks.
Further details of current and recent project in MIMO, are given in the project pages: please follow the links below.
MIMO and Spread Spectrum Systems: Projects
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Optimized Heterogeneous Multiuser MIMO NetworksMembers: Rodrigo de Lamare This project deals with robust multiuser MIMO (Multiple-Input Multiple-Output) networks using heterogeneous wireless mobile access technologies (ad-hoc network type communications but also third generation (WLAN, UMTS) and fourth generation communications). Our aim is to develop several novel techniques taking into account the rich diversity offered by the networks (space, time and frequency). We also wish to guarantee a fixed quality of service through cross-system diversity. |