TY - JOUR
T1 - Asymptotic spectral efficiency of multiantenna links in wireless networks with limited Tx CSI
AU - Govindasamy, Siddhartan
AU - Bliss, Daniel W.
AU - Staelin, David H.
N1 - Funding Information:
Manuscript received July 01, 2010; revised November 14, 2011; accepted January 09, 2012. Date of publication March 22, 2012; date of current version July 10, 2012. This work was supported in part by the National Science Foundation under Grant ANI-0333902. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the United States Government. Portions of the material in this paper were presented at the Asilomar Conference on Signals, Systems, and Computers, Pacific Grove CA, November 2009.
PY - 2012
Y1 - 2012
N2 - An asymptotic technique is presented for finding the spectral efficiency of multiantenna links in spatially distributed wireless networks where transmitters have channel-state-information (CSI) corresponding to their target receiver. Transmitters are assumed to transmit independent data streams on a limited number of channel modes which limits the rank of transmit covariance matrices. An approximation for the spectral efficiency in the interference-limited regime as a function of link-length, interferer density, number of antennas per receiver and transmitter, number of transmit streams, and path-loss exponent is derived. It is found that targeted-receiver CSI, which can be acquired with low overhead in duplex systems with reciprocity, can increase spectral efficiency several fold, particularly when link lengths are large, node density is high, or both. Additionally, the per-link spectral efficiency is found to be a function of the ratio of node density to the number of receiver antennas, and it can often be improved if nodes transmit using fewer streams. These results are validated for finite-sized systems by Monte-Carlo simulation and are asymptotic in the regime where the number of users and antennas per receiver approach infinity.
AB - An asymptotic technique is presented for finding the spectral efficiency of multiantenna links in spatially distributed wireless networks where transmitters have channel-state-information (CSI) corresponding to their target receiver. Transmitters are assumed to transmit independent data streams on a limited number of channel modes which limits the rank of transmit covariance matrices. An approximation for the spectral efficiency in the interference-limited regime as a function of link-length, interferer density, number of antennas per receiver and transmitter, number of transmit streams, and path-loss exponent is derived. It is found that targeted-receiver CSI, which can be acquired with low overhead in duplex systems with reciprocity, can increase spectral efficiency several fold, particularly when link lengths are large, node density is high, or both. Additionally, the per-link spectral efficiency is found to be a function of the ratio of node density to the number of receiver antennas, and it can often be improved if nodes transmit using fewer streams. These results are validated for finite-sized systems by Monte-Carlo simulation and are asymptotic in the regime where the number of users and antennas per receiver approach infinity.
KW - Ad hoc networks
KW - MIMO
KW - antenna arrays
KW - stochastic geometry
KW - wireless networks
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U2 - 10.1109/TIT.2012.2191703
DO - 10.1109/TIT.2012.2191703
M3 - Article
AN - SCOPUS:84863963810
SN - 0018-9448
VL - 58
SP - 5375
EP - 5387
JO - IEEE Transactions on Information Theory
JF - IEEE Transactions on Information Theory
IS - 8
M1 - 6172677
ER -