Achieving large spectral efficiency with TDD and not-so-many base-station antennas
- 1 September 2011
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1346-1349
- https://doi.org/10.1109/apwc.2011.6046845
Abstract
Time-Division duplexing (TDD) allows to estimate the downlink channels for an arbitrarily large number of base station antennas by using a finite number of orthogonal pilot signals in the uplink, by exploiting channel reciprocity. Based on this observation, a recently proposed “Massive MIMO” scheme was shown to achieve unprecedented system spectral efficiency using a very simple beamforming scheme and a very large number of base station antennas per active user per cell. In this work, we consider a more sophisticated system design that partition the users' population in geographically determined “bins” and for each bin selects the best scheme in a family of network- MIMO schemes defined by the type of linear beamforming, cooperation among base stations, frequency reuse, pilot reuse and user loading factors. The spectral efficiency obtained by the proposed architecture is similar to that achieved by “Massive MIMO”, with a 10-fold reduction in the number of antennas at the base stations (roughly, from 500 to 50 antennas).Keywords
This publication has 8 references indexed in Scilit:
- Pilot Contamination and Precoding in Multi-Cell TDD SystemsIEEE Transactions on Wireless Communications, 2011
- Achieving large spectral efficiencies from MU-MIMO with tens of antennas: Location-adaptive TDD MU-MIMO design and user schedulingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010
- Noncooperative Cellular Wireless with Unlimited Numbers of Base Station AntennasIEEE Transactions on Wireless Communications, 2010
- Multiuser MISO Transmitter Optimization for Intercell Interference MitigationIEEE Transactions on Signal Processing, 2010
- Multiuser MIMO downlink with limited inter-cell cooperation: Approximate interference alignment in time, frequency and spacePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- Limited Downlink Network Coordination in Cellular NetworksPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- How Much Training is Required for Multiuser Mimo?Published by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Communication on the Grassmann manifold: a geometric approach to the noncoherent multiple-antenna channelIEEE Transactions on Information Theory, 2002