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On the Quantization of Phase Shifters for Hybrid Precoding Systems

Lin, Yuan-Pei (2017) On the Quantization of Phase Shifters for Hybrid Precoding Systems. IEEE Transactions on Signal Processing, 65 (9). pp. 2237-2246. ISSN 1053-587X.

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Hybrid precoding that combines analog RF processing and digital baseband processing has been shown to be a promising technique for transceivers with limited number of RF chains. The RF processing, due to power and complexity issue, is typically done by using phase shifters. A recent study shows that hybrid precoding is no loss of generality if each coefficient of the analog precoder is implemented by using two phase shifters. In this paper, we consider two possible implementation structures that use Two pHase shIfters for each Coefficient (THIC). These two structures, having the same performance when the phases can take on continuum values, behave differently upon quantization, as the analysis shows. For a small number of quantization bits, the precoder implemented using THIC is a good approximation of the unquantized one. With 3-bit phase shifters, the performance is close to that of the unquantized system in multiuser communications, where the performance is more sensitive to quantization errors. While the analysis in this paper is done assuming high-resolution quantization, simulations show that the result is accurate even for coarse quantization.

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Additional Information:© 2017 IEEE. Manuscript received February 26, 2016; revised September 4, 2016 and December 5, 2016; accepted December 24, 2016. Date of publication December 30, 2016; date of current version February 21, 2017. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Kostas D. Berberidis. This work was supported by the Ministry of Science and Technology, Taiwan, R.O.C., under Grant MOST 104-2221-E-009-080-MY2.
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)MOST 104-2221-E-009-080-MY2
Subject Keywords:Analog precoding, hybrid precoding, millimeter wave communications, phase shifter, quantization of phase shifter, minimum RF chain
Record Number:CaltechAUTHORS:20170323-134342432
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Official Citation:Y. P. Lin, "On the Quantization of Phase Shifters for Hybrid Precoding Systems," in IEEE Transactions on Signal Processing, vol. 65, no. 9, pp. 2237-2246, May1, 1 2017. doi: 10.1109/TSP.2016.2646659
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75360
Deposited By: Ruth Sustaita
Deposited On:23 Mar 2017 21:28
Last Modified:23 Mar 2017 21:28

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