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In recent years, digital beamforming has evolved into an excellent technology to improve wireless communications over fading channels. Especially in slow fading environments with a sufficient number of users in the system, opportunistic beamforming through multiuser diversity [1] has offered some advantages over true beamforming methods that rely on full channel feedback and/or robust channel estimation...
Traditional link-layer automatic repeat request (ARQ) protocols attempt to retransmit the corrupted frames regardless of the channel state. Since this channel-state unaware behavior may cause unnecessary retransmissions, traditional ARQ protocols may not be energy efficient Some channel- adaptive ARQ ideas have been proposed, such as, channel probing based ARQ and stochastic learning automaton based...
As evidenced by measurement data, channel fading and co-channel interference occur on the same time scales, and it is therefore difficult to determine if packet losses are due to interference change or channel variation. The coupling between the timescales of fading and interference at the MAC layer calls for a unified PHY/MAC design. Using optimal stopping theory, we first devise channel aware distributed...
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