Abstract
It is well known that channel state information at the transmitter (CSIT) leads to higher throughput in fading channels. We motivate the use of transmit buffer information at receiver (TBIR). The thesis of this paper is that having partial or complete instantaneous TBIR leads to a lower packet loss rate in block-fading channels assuming the availability of partial CSIT. We provide a framework for the joint design and analysis of feedback (FB) and feed-forward (FF) information in fading channels. We then introduce two forms of TBIR—statistical and instantaneous—and show the gains of each form of TBIR using a heuristic scheme. For a Rayleigh fading channel, we show that in certain cases the packet error rate reduces by nearly an order of magnitude with just one bit of feed-forward information of TBIR.
Highlights
It is well known that the Shannon capacity of a discrete memoryless channel (DMC) does not increase with feedback from the receiver [1]
The capacity of fading channels increases with channel knowledge at the transmitter, and the capacity gain has been quantified for both single-antenna [2] and multiple-antenna [3] systems
We numerically study the performance of the proposed adaptation strategies with no transmit buffer information at receiver (TBIR), statistical TBIR, and instantaneous TBIR
Summary
It is well known that the Shannon capacity of a discrete memoryless channel (DMC) does not increase with feedback from the receiver [1]. (i) A new transmission system architecture with a feed-forward channel that transmits queue state information from the transmitter to the receiver is introduced, and (ii) the CSI that is sent to the transmitter via a feedback channel is chosen adaptively based on instantaneous or statistical knowledge of TBIR (the terms buffer and queue are used interchangeably in this paper). (ii) The performance gain resulting from using the statistical FF information to adapt the channel quantizer at the receiver and generate the CSI is quantified. When no CSIT is available, the transmission rate and power cannot be adapted based on channel conditions, and the use of FF information does not provide any performance benefits. The overall design objective is to minimize the total packet loss rate resulting from buffer overflows and errors in the transmission over the channel.
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