Τίτλος:
Ergodic capacity optimization for single-stream beamforming transmission in MISO rician fading channels
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The maximization of the ergodic capacity for single-stream beamforming, which is a (constrained) transmission scheme referred to as 'optimum beamforming,' has been extensively addressed in the open literature for multiple-input-single-output (MISO) Rayleigh fading channels and spatially uncorrelated MISO Rician fading channels with a unit transmit covariance matrix, and closed-form solutions have been derived for these cases. However, optimum beamforming for spatially correlated or uncorrelated MISO Rician fading channels with a nonunit transmit covariance matrix has received less attention and remains a complex multidimensional optimization problem. This paper first proves that this convex constrained optimization problem can be reduced to only one dimension; hence, it can be solved very fast using standard 1-D search algorithms. Then, simulations mainly performed for linear equispaced antenna arrays demonstrate that: 1) the proposed method for the calculation of the optimum beamformer has significantly lower computational complexity compared with other currently used multidimensional algorithms; and 2) the optimum beamformer further improves capacity compared with the (single-stream) beamforming transmission that maximizes the signal-to-noise ratio (SNR) at the receiver, whereas in some operational environments, it achieves ergodic capacity that is very close or equal to the maximum ergodic capacity. © 1967-2012 IEEE.
Συγγραφείς:
Kontaxis, D.E.
Tsoulos, G.V.
Karaboyas, S.
Περιοδικό:
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Εκδότης:
Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Λέξεις-κλειδιά:
Algorithms; Antenna arrays; Channel capacity; Constrained optimization; Covariance matrix; Rayleigh fading; Signal to noise ratio; Transmissions, Beam formers; Capacity optimization; Closed form solutions; Constrained optimi-zation problems; Ergodic capacity; Multidimensional optimization; One dimension; Operational environments; Optimum beamforming; Rician fading channel; Search Algorithms; Signaltonoise ratio (SNR); Transmission schemes, Beamforming
DOI:
10.1109/TVT.2012.2227151
