Limited-Rate Channel State Feedback for Multicarrier Block Fading Channels

TL;DR

This paper investigates power loading in multicarrier block fading channels using minimal feedback, specifically one bit per sub-channel, to enhance capacity with limited channel state information.

Contribution

It introduces a method for power allocation in multicarrier systems utilizing only one bit of feedback per sub-channel, addressing feedback constraints.

Findings

Power loading improves capacity under limited feedback.

Correlation among sub-channels affects feedback efficiency.

One-bit feedback per sub-channel is effective for capacity enhancement.

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.