NDLI: Limited-rate channel state feedback for multicarrier block fading channels 1 (2008).

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Limited-rate channel state feedback for multicarrier block fading channels 1 (2008).

Content Provider	CiteSeerX
Author	Agarwal, Manish Guo, Dongning Honig, Michael L.
Abstract	The capacity of a fading channel can be substantially increased by feeding back channel state information from the receiver to the transmitter. With limited-rate feedback what state information to feed back and how to encode it are important open questions. This paper studies power loading in a multicarrier system using no more than one bit of feedback per sub-channel. The sub-channels can be correlated and full channel state information is assumed at the receiver. First, a simple model with N parallel two-state (good/bad) memoryless sub-channels is considered, where the channel state feedback is used to select a fixed number of sub-channels to activate. The optimal feedback scheme is the solution to a vector quantization problem, and the associated performance for large N is characterized by a rate distortion function. As N increases, we show that the loss in forward rate from the asymptotic (rate-distortion) value decreases as (log N)/N and √ (log N)/N with optimal variable- and fixed-rate feedback codes, respectively. We subsequently extend these results to parallel Rayleigh block fading sub-channels, where the feedback designates a set of sub-channels, which are activated with equal power. Rate-distortion feedback codes are proposed for designating subsets of (good) sub-channels with Signal-to-Noise Ratios (SNRs) that exceed a threshold. The associated performance is compared with that of a simpler lossless source coding scheme, which designates groups of good sub-channels, where both the group size and threshold are optimized. The rate-distortion codes can provide a significant increase in forward rate at low SNRs.
File Format	PDF
Publisher Date	2008-01-01
Access Restriction	Open
Content Type	Text
Resource Type	Article

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