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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| Veröffentlicht in: | IEEE wireless communications letters Jg. 4; H. 2; S. 221 - 224 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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Piscataway
IEEE
01.04.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 2162-2337, 2162-2345 |
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| Abstract | 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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| AbstractList | 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. 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 [Formula Omitted] for a fixed [Formula Omitted]. 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., [Formula Omitted]), is small ( [Formula Omitted] dB) for many practical values of [Formula Omitted]. Further, irrespective of the value of [Formula Omitted], 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. |
| Author | Mohammed, Saif Khan Mukherjee, Sudarshan |
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| Cites_doi | 10.1109/WCL.2013.071713.130328 10.1109/TCOMM.2013.020413.110848 10.1109/MCOM.2014.6736761 10.1109/MSP.2011.2178495 10.1109/TWC.2010.092810.091092 10.1109/TCOMM.2014.2364188 10.1109/TCOMM.2013.012913.110827 10.1109/18.243446 |
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| SubjectTerms | Complexity theory constant envelope Gain Information rates Massive MIMO MIMO Transmitting antennas Vectors |
| Title | Constant-Envelope Precoding With Time-Variation Constraint on the Transmitted Phase Angles |
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