Degrees-of-Freedom Region of MISO-OFDMA Broadcast Channel with Imperfect CSIT
arXiv:1310.6669
Abstract
This contribution investigates the Degrees-of-Freedom region of a two-user frequency correlated Multiple-Input-Single-Output (MISO) Broadcast Channel (BC) with imperfect Channel State Information at the transmitter (CSIT). We assume that the system consists of an arbitrary number of subbands, denoted as . Besides, the CSIT state varies across users and subbands. A tight outer-bound is found as a function of the minimum average CSIT quality between the two users. Based on the CSIT states across the subbands, the DoF region is interpreted as a weighted sum of the optimal DoF regions in the scenarios where the CSIT of both users are perfect, alternatively perfect and not known. Inspired by the weighted-sum interpretation and identifying the benefit of the optimal scheme for the unmatched CSIT proposed by Chen et al., we also design a scheme achieving the upper-bound for the general -subband scenario in frequency domain BC, thus showing the optimality of the DoF region.
Submitted to IEEE Transactions on Information Theory
References in corpus (8)
- On the Capacity of Fading MIMO Broadcast Channels with Imperfect Transmitter Side-Information
- 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
- Imperfect and Unmatched CSIT is Still Useful for the Frequency Correlated MISO Broadcast Channel
- Minimum CSIT to achieve Maximum Degrees of Freedom for the MISO BC
- Symmetric Two-User MIMO BC and IC with Evolving Feedback
- Optimal DoF Region of the Two-User MISO-BC with General Alternating CSIT
- Degrees-of-Freedom Region of Time Correlated MISO Broadcast Channel with Perfect Delayed CSIT and Asymmetric Partial Current CSIT