Shifting the MIMO paradigm
Abstract
The last ten years have witnessed the transition of multiple-input multiple output (MIMO) communication from a theoretical concept to a practical technique for enhancing performance of wireless networks [1]. Point-to-point (single-user) MIMO communication promises large gains for both channel capacity and reliability, essentially via the use of space-time codes (diversity gain oriented) combined with stream multiplexed transmission (rate maximization oriented). In such a traditional single-user view of MIMO systems, the extra spatial degrees of freedom (DoF) brought by the use of multiple antennas are exploited to expand the dimensions available for signal processing and detection, thus acting mainly as a physical (PHY) layer performance booster. In this approach, the link layer protocols for multiple access (uplink and downlink) indirectly reap the performance benefits of MIMO antennas in the form of greater per-user rates or more reliable channel quality despite not requiring full awareness of the MIMO capability.
- Publication:
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IEEE Signal Processing Magazine
- Pub Date:
- 2007
- DOI:
- Bibcode:
- 2007ISPM...24...36G
- Keywords:
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- MIMO;
- Downlink;
- Antennas and propagation;
- Optimal scheduling;
- Access protocols;
- Information theory;
- Signal processing algorithms;
- Scheduling algorithm;
- Costs;
- OFDM