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Optimized Power Allocation for Multiantenna Systems Impaired by Multiple Access Interference and Imperfect Channel Estimation.

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Bibliographic Details
Title: Optimized Power Allocation for Multiantenna Systems Impaired by Multiple Access Interference and Imperfect Channel Estimation.
Authors: Baccarelli, Enzo, Biagi, Mauro, Pelizzoni, Cristian, Cordeschi, Nicola
Source: IEEE Transactions on Vehicular Technology; Sep2007 Part 2 of 2, Vol. 56 Issue 5, p3089-3105, 17p, 1 Black and White Photograph, 1 Diagram, 1 Chart, 1 Graph
Subject Terms: MULTIPLE access protocols (Computer network protocols), COMPUTER network protocols, COMPUTER networks, MIMO systems, WIRELESS communications, TELECOMMUNICATION systems, DATA transmission systems, ELECTRONIC data processing, ELECTROMAGNETIC interference
Abstract: This paper presents an optimized spatial signal shaping for multiple-input-multiple-output (MIMO) "ad hoc"-like networks. It is adopted for maximizing the information throughput of pilot-based multiantenna systems that are affected by spatially colored multiple access interference (MAI) and channel estimation errors. After deriving the architecture of the minimum mean square error (MMSE) MIMO channel estimator, closed-form expressions for the maximum information throughput that is sustained by the MAI-affected MIMO links are provided. Then, we present a novel power allocation algorithm for achieving the resulting link capacity. Several numerical results are provided to compare the performance achieved by the proposed power-allocation algorithm with that of the corresponding MIMO system that works in MAI-free environments and is equipped with error free (e.g., perfect) channel estimates. By so doing, we are able to give an insight on the ultimate performance loss that is induced in MIMO systems by spatially colored MA! and imperfect channel estimates. Finally, we point out some implications about space- division multiple access strategies arising from the proposed power allocation algorithm. [ABSTRACT FROM AUTHOR]
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Database: Complementary Index
Description
Abstract:This paper presents an optimized spatial signal shaping for multiple-input-multiple-output (MIMO) "ad hoc"-like networks. It is adopted for maximizing the information throughput of pilot-based multiantenna systems that are affected by spatially colored multiple access interference (MAI) and channel estimation errors. After deriving the architecture of the minimum mean square error (MMSE) MIMO channel estimator, closed-form expressions for the maximum information throughput that is sustained by the MAI-affected MIMO links are provided. Then, we present a novel power allocation algorithm for achieving the resulting link capacity. Several numerical results are provided to compare the performance achieved by the proposed power-allocation algorithm with that of the corresponding MIMO system that works in MAI-free environments and is equipped with error free (e.g., perfect) channel estimates. By so doing, we are able to give an insight on the ultimate performance loss that is induced in MIMO systems by spatially colored MA! and imperfect channel estimates. Finally, we point out some implications about space- division multiple access strategies arising from the proposed power allocation algorithm. [ABSTRACT FROM AUTHOR]
ISSN:00189545
DOI:10.1109/TVT.2007.900514