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Auctions have been proposed as a way to provide economic incentives to dynamically allocate unused spectrum to users in need of it. Previously proposed auction schemes do not take into account the fact that users' power and bandwidth constraints might prevent them from transmitting their bid prices to the auctioneer with high precision, and that these transmitted bid prices must travel through a noisy...
In certain communications systems, it is a reasonable to assume the presence of a noisy feedback channel. The ability to send data from receiver back to transmitter opens new doors in the way of modulation schemes. In this paper, we investigate the class of linear feedback encoding schemes in which the transmitter linearly encodes the feedback information along with the message to be sent. Given a...
Physical layer multicasting in wireless networks has been proposed to efficiently send an identical message to multiple users simultaneously. In this paper, we consider multiple antenna multicasting where the transmitter is equipped with Mt antennas and data is transmitted to K single-antenna users. When the downlink channels are assumed to follow an uncorrelated Rayleigh distribution, the multicasting...
The integration of the feedback channel into a coding scheme cannot increase capacity but still has many benefits such as higher reliability and lower complexity. In the class of linear feedback coding schemes, one of the most well-known is the Schalkwijk-Kailath coding scheme. Using the same framework, an optimized coding scheme is produced using linear algebraic tools, and this scheme is compared...
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