Pilot Assignment for Joint Uplink-Downlink Spectral Efficiency Enhancement in Massive MIMO Systems With Spatial Correlation

This paper proposes a flexible pilot assignment method to jointly optimize the uplink and downlink data transmission in multi-cell Massive multiple input multiple output (MIMO) systems with correlated Rayleigh fading channels. By utilizing a closed-form expression of the ergodic spectral efficiency...

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Vydáno v:IEEE transactions on vehicular technology Ročník 70; číslo 8; s. 8292 - 8297
Hlavní autoři: Nguyen, Tien Hoa, Chien, Trinh Van, Ngo, Hien Quoc, Tran, Xuan Nam, Bjornson, Emil
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.08.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Algorithms
Channel estimation
Closed-form expression
Combinatorial optimization
Combinatorial optimization problems
Contamination
Correlated Rayleigh fading channels
Data communication
Data transmission
Downlink
Downlinking
Efficiency
Ergodic spectral efficiencies
Fading channels
Heuristic algorithms
Interference
Massive MIMO
Massive multiple-input- multiple-output system (MIMO)
max-min fairness optimization
MIMO systems
Optimization
Optimization problems
pilot assignment
Power control
Rayleigh fading
Sequential algorithm
Signal to noise ratio
Spectral efficiencies
Uplink
max-min fairness optimization
pilot assignment
Channel estimation
Interference
Massive MIMO
Downlink
Data communication
Uplink
Contamination
Signal to noise ratio
ISSN:0018-9545, 1939-9359, 1939-9359
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Shrnutí:This paper proposes a flexible pilot assignment method to jointly optimize the uplink and downlink data transmission in multi-cell Massive multiple input multiple output (MIMO) systems with correlated Rayleigh fading channels. By utilizing a closed-form expression of the ergodic spectral efficiency (SE) achieved with maximum ratio processing, we formulate an optimization problem for maximizing the minimum weighted sum of the uplink and downlink SEs subject to the transmit powers and pilot assignment sets. This combinatiorial optimization problem is solved by two sequential algorithms: a heuristic pilot assignment is first proposed to obtain a good pilot reuse set and the data power control is then implemented. Numerical results manifest that the proposed algorithm converges fast to a better minimum sum SE per user than the algorithms in previous works.
Bibliografie:ObjectType-Article-1
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ISSN:0018-9545
1939-9359
1939-9359
DOI:10.1109/TVT.2021.3091020