An Adaptive Channel Model for VBLAST in Vehicular Networks
<p/> <p>The wireless transmission environment in vehicular ad hoc systems varies from line of sight with few surroundings to rich Rayleigh fading. An efficient communication system must adapt itself to these diverse conditions. Multiple antenna systems are known to provide superior perfo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2009-01-01
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| Series: | EURASIP Journal on Wireless Communications and Networking |
| Online Access: | http://jwcn.eurasipjournals.com/content/2009/328706 |
| Summary: | <p/> <p>The wireless transmission environment in vehicular ad hoc systems varies from line of sight with few surroundings to rich Rayleigh fading. An efficient communication system must adapt itself to these diverse conditions. Multiple antenna systems are known to provide superior performance compared to single antenna systems in terms of capacity and reliability. The correlation between the antennas has a great effect on the performance of MIMO systems. In this paper we introduce a novel adaptive channel model for MIMO-VBLAST systems in vehicular ad hoc networks. Using the proposed model, the correlation between the antennas was investigated. Although the line of sight is ideal for single antenna systems, it severely degrades the performance of VBLAST systems since it increases the correlation between the antennas. A channel update algorithm using single tap Kalman filters for VBLAST in flat fading channels has also been derived and evaluated. At 12 dB <inline-formula> <graphic file="1687-1499-2009-328706-i1.gif"/></inline-formula>, the new algorithm showed 50% reduction in the mean square error (MSE) between the actual channel and the corresponding updated estimate compared to the MSE without update. The computational requirement of the proposed algorithm for a <inline-formula> <graphic file="1687-1499-2009-328706-i2.gif"/></inline-formula> VBLAST is 6<inline-formula> <graphic file="1687-1499-2009-328706-i3.gif"/></inline-formula> real multiplications and 4<inline-formula> <graphic file="1687-1499-2009-328706-i4.gif"/></inline-formula> real additions.</p> |
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| ISSN: | 1687-1472 1687-1499 |