Large-System Analysis of Joint User Selection and Vector Precoding for Multiuser MIMO Downlink
arXiv:1204.3711
Abstract
Joint user selection (US) and vector precoding (US-VP) is proposed for multiuser multiple-input multiple-output (MU-MIMO) downlink. The main difference between joint US-VP and conventional US is that US depends on data symbols for joint US-VP, whereas conventional US is independent of data symbols. The replica method is used to analyze the performance of joint US-VP in the large-system limit, where the numbers of transmit antennas, users, and selected users tend to infinity while their ratios are kept constant. The analysis under the assumptions of replica symmetry (RS) and 1-step replica symmetry breaking (1RSB) implies that optimal data-independent US provides nothing but the same performance as random US in the large-system limit, whereas data-independent US is capacity-achieving as only the number of users tends to infinity. It is shown that joint US-VP can provide a substantial reduction of the energy penalty in the large-system limit. Consequently, joint US-VP outperforms separate US-VP in terms of the achievable sum rate, which consists of a combination of vector precoding (VP) and data-independent US. In particular, data-dependent US can be applied to general modulation, and implemented with a greedy algorithm.
References in corpus (8)
- Broken Replica Symmetry Bounds in the Mean Field Spin Glass Model
- Vector Precoding for Wireless MIMO Systems: A Replica Analysis
- Analysis of CDMA systems that are characterized by eigenvalue spectrum
- Sum Rates, Rate Allocation, and User Scheduling for Multi-User MIMO Vector Perturbation Precoding
- Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels
- The infinite volume limit in generalized mean field disordered models
- Large-System Analysis of Joint Channel and Data Estimation for MIMO DS-CDMA Systems
- A Greedy Algorithm of Data-Dependent User Selection for Fast Fading Gaussian Vector Broadcast Channels