Constant-Envelope Precoding With Time-Variation Constraint on the Transmitted Phase Angles

We consider downlink precoding in a frequency-selective multi-user massive MIMO system with highly efficient but non-linear power amplifiers at the base station (BS). A low-complexity precoding algorithm is proposed, which generates constant-envelope (CE) transmit signals for each BS antenna. To avo...

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Bibliographic Details
Published in:IEEE wireless communications letters Vol. 4; no. 2; pp. 221 - 224
Main Authors: Mukherjee, Sudarshan, Mohammed, Saif Khan
Format: Journal Article
Language:English
Published: Piscataway IEEE 01.04.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Complexity theory
constant envelope
Gain
Information rates
Massive MIMO
MIMO
Transmitting antennas
Vectors
Massive MIMO
constant envelope
ISSN:2162-2337, 2162-2345
Online Access:Get full text
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Summary:We consider downlink precoding in a frequency-selective multi-user massive MIMO system with highly efficient but non-linear power amplifiers at the base station (BS). A low-complexity precoding algorithm is proposed, which generates constant-envelope (CE) transmit signals for each BS antenna. To avoid large variations in the phase angle transmitted from each antenna, the difference of the phase angles transmitted in consecutive channel uses is limited to [-απ, απ] for a fixed 0 <; α ≤ 1. With independent Rayleigh distributed channel gains, numerical studies reveal that the extra total transmit power required under the time variation constraint when compared to the case of no time variation constraint (i.e., α = 1), is small (<; 2 dB) for many practical values of α. Further, irrespective of the value of α, the required total transmit power to achieve a fixed per-user information rate decreases by roughly 3 dB with every doubling in the number of BS antennas.
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ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2015.2399918