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On multiple access and capacity in frequency-selective channels

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1 Author(s)
Flikkema, P.G. ; Dept. of Electr. Eng., Northern Arizona Univ., Flagstaff, AZ, USA

Investigates the problem of improving communication rates for frequency-selective multi-access channels (MACs). In this context, multi-pulse methods offer a new opportunity to revisit MAC approaches that are aware of and exploit channel characteristics. For the single-link case, multi-pulse methods such as OFDM split the channel into a set of orthogonal subchannels, or dimensions, and enable the use of Shannon's water-filling technique to achieve capacity. This paper proposes MAC approaches based on water-filling for high-speed ad-hoc wireless networks. The basic framework divides time into uniform slots; during each interval, the active links must share the subchannels, with each link defined by its set of per-subchannel SNRs. Using this framework, pragmatic protocols are proposed that balance overall capacity and per-link quality of service. They are based on adaptively allocating slots and subchannels using knowledge of the links

Published in:

Information Technology: Coding and Computing, 2001. Proceedings. International Conference on

Date of Conference:

Apr 2001