Symmetric Two-User MIMO BC and IC with Evolving Feedback
arXiv:1306.3710
Abstract
Extending recent findings on the two-user MISO broadcast channel (BC) with imperfect and delayed channel state information at the transmitter (CSIT), the work here explores the performance of the two user MIMO BC and the two user MIMO interference channel (MIMO IC), in the presence of feedback with evolving quality and timeliness. Under standard assumptions, and in the presence of M antennas per transmitter and N antennas per receiver, the work derives the DoF region, which is optimal for a large regime of sufficiently good (but potentially imperfect) delayed CSIT. This region concisely captures the effect of having predicted, current and delayed-CSIT, as well as concisely captures the effect of the quality of CSIT offered at any time, about any channel. In addition to the progress towards describing the limits of using such imperfect and delayed feedback in MIMO settings, the work offers different insights that include the fact that, an increasing number of receive antennas can allow for reduced quality feedback, as well as that no CSIT is needed for the direct links in the IC.
This paper will be presented in part at SPAWC13
References in corpus (9)
- On the Capacity of Fading MIMO Broadcast Channels with Imperfect Transmitter Side-Information
- Capacity Results for Binary Fading Interference Channels with Delayed CSIT
- Degrees-of-Freedom Region of the MISO Broadcast Channel with General Mixed-CSIT
- On the Degrees of Freedom of the K-User Time Correlated Broadcast Channel with Delayed CSIT
- Fundamental Limits of Cooperation
- Imperfect and Unmatched CSIT is Still Useful for the Frequency Correlated MISO Broadcast Channel
- On the Degrees of Freedom of time correlated MISO broadcast channel with delayed CSIT
- MISO Broadcast Channel with Delayed and Evolving CSIT
- On the Fundamental Feedback-vs-Performance Tradeoff over the MISO-BC with Imperfect and Delayed CSIT