Selective decoding schemes and wireless MAC operating in MIMO ad hoc networks
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Publication Details
Author list: Suleesathira R., Aksiripipatkul J.
Publisher: Institute of Electrical and Electronics Engineers
Publication year: 2011
Journal: Journal of Communications and Networks (1229-2370)
Volume number: 13
Issue number: 5
Start page: 421
End page: 427
Number of pages: 7
ISSN: 1229-2370
eISSN: 1976-5541
Languages: English-Great Britain (EN-GB)
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Abstract
Problems encountered in IEEE 802.11 medium access control (MAC) design are interferences from neighboring or hidden nodes and collision from simultaneous transmissions within the same contention floors. This paper presents the selective decoding schemes in MAC protocol for multiple input multiple output ad-hoc networks. It is able to mitigate interferences by using a developed minimum mean-squared error technique. This interference mitigation combined with the maximum likelihood decoding schemes for the Alamouti coding enables the receiver to decode and differentiate the desired data streams from co-channel data streams. As a result, it allows a pair of simultaneous transmissions to the same or different nodes which yields the network utilization increase. Moreover, the presented three decoding schemes and time line operations are optimally selected corresponding to the transmission demand of neighboring nodes to avoid collision. The selection is determined by the number of request to send (RTS) packets and the type of clear to send packets. Both theoretical channel capacity and simulation results show that the proposed selective decoding scheme MAC protocol outperforms the mitigation interference using multiple antennas and the parallel RTS processing protocols for the cases of (1) single data stream and (2) two independent data streams which are simultaneously transmitted by two independent transmitters. ฉ 2011 KICS.
Keywords
Alamouti code, Maximum likelihood (ML) decoding, Medium access control (MAC)
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