tailieunhanh - Báo cáo hóa học: " Research Article Multiple-Antenna Interference Cancellation for WLAN with MAC Interference Avoidance in Open Access Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Multiple-Antenna Interference Cancellation for WLAN with MAC Interference Avoidance in Open Access Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 51358 11 pages doi 2007 51358 Research Article Multiple-Antenna Interference Cancellation for WLAN with MAC Interference Avoidance in Open Access Networks AlexandrM. Kuzminskiy1 and Hamid Reza Karimi1 2 1 Alcatel-Lucent Bell Laboratories The Quadrant Stonehill Green Westlea Swindon SN5 7DJ UK 2 Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA UK Received 31 October 2006 Accepted 3 September 2007 Recommended by Monica Navarro The potential of multiantenna interference cancellation receiver algorithms for increasing the uplink throughput in WLAN systems such as is investigated. The medium access control MAC in such systems is based on carrier sensing multiple-access with collision avoidance CSMA CA which itself is a powerful tool for the mitigation of intrasystem interference. However due to the spatial dependence of received signal strengths it is possible for the collision avoidance mechanism to fail resulting in packet collisions at the receiver and a reduction in system throughput. The CSMA CA MAC protocol can be complemented in such scenarios by interference cancellation IC algorithms at the physical PHY layer. The corresponding gains in throughput are a result of the complex interplay between the PHY and MAC layers. It is shown that semiblind interference cancellation techniques are essential for mitigating the impact of interference bursts in particular since these are typically asynchronous with respect to the desired signal burst. Semiblind IC algorithms based on second- and higher-order statistics are compared to the conventional no-IC and training-based IC techniques in an open access network OAN scenario involving home and visiting users. It is found that the semiblind IC algorithms significantly outperform the other techniques due to the bursty and asynchronous nature of the interference caused by the MAC .

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