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Single-cell MU-MISO (multi-user multiple-input single-output) hybrid precoding system and analog wave beam selecting method thereof

An analog beam, single-cell technology, applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc., can solve the problems of increasing system hardware cost and power consumption, and achieve the effect of ensuring performance gain and reducing search space.

Active Publication Date: 2019-03-29
PEKING UNIV
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  • Claims
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Problems solved by technology

Traditional precoding technology processes digital signals at the baseband end, requiring each antenna to have a complete radio frequency link, including radio frequency devices such as digital-to-analog converters and power amplifiers. As the number of antennas in Massive MIMO systems increases, the It reduces the hardware cost and power consumption of the system, and brings huge challenges to the system design

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  • Single-cell MU-MISO (multi-user multiple-input single-output) hybrid precoding system and analog wave beam selecting method thereof
  • Single-cell MU-MISO (multi-user multiple-input single-output) hybrid precoding system and analog wave beam selecting method thereof
  • Single-cell MU-MISO (multi-user multiple-input single-output) hybrid precoding system and analog wave beam selecting method thereof

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Embodiment Construction

[0028] The present invention will be described in detail below through specific examples and accompanying drawings.

[0029] (1) System model

[0030] Consider a single-cell MU-MISO hybrid precoding system: Assume that the base station is configured with a line antenna array consisting of M antennas and N radio frequency links. The base station serves K single-antenna users at the same time, generally K≤N≤M; the transmitter adopts a fully connected architecture, and the precoding consists of an N×K dimensional digital precoding matrix W BB and an M×N dimensional analog precoding matrix Composition, such as figure 1 shown. is the analog precoding vector corresponding to the i-th radio frequency link, and can also be regarded as the analog beam corresponding to the i-th radio frequency link.

[0031] Combined with the actual system, consider that the analog precoding is realized by a phase shifter, and further consider the analog beam vector from the pre-specified codebook...

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Abstract

The invention discloses a single-cell MU-MISO (multi-user multiple-input single-output) hybrid precoding system and an analog wave beam selecting method thereof. The method includes: 1) randomly selecting N codewords from a codebook of a size B to form an initial analog wave beam combination corresponding to analog wave beams formed by N radio frequency links; 2) carrying out iteration calculationon the analog wave beam combination, wherein in each time of iteration, one radio frequency link is selected to change an analog wave beam, analog wave beams corresponding to the other radio frequency links remain unchanged, total system rates corresponding to various new analog wave beam combinations in current iteration are calculated, and a new analog wave beam combination maximizing increasing of a total system rate is selected to be used as a current iteration result; and 3) when iteration converges or reaches specified maximum iteration frequency L, stopping iteration, and using a finaliteration result as an optimal analog wave beam combination. Complexity of the method is much smaller than that of an exhaustive method, and the method of the invention is suitable for application inpractical systems.

Description

technical field [0001] The invention relates to a single-cell MU-MISO hybrid precoding system and an analog beam selection method thereof, belonging to the technical field of wireless communication. Background technique [0002] Massive multiple-input multiple-output (Massive multiple-input multiple-output, Massive MIMO) is regarded as one of the key technologies of the fifth generation mobile communication system, which can greatly improve spectrum utilization. In order to solve the inter-user interference problem of a multi-user multiple-input single-output (MU-MISO) system, a base station adopts a precoding technology. Traditional precoding technology processes digital signals at the baseband end, requiring each antenna to have a complete radio frequency link, including radio frequency devices such as digital-to-analog converters and power amplifiers. As the number of antennas in Massive MIMO systems increases, the It reduces the hardware cost and power consumption of th...

Claims

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Application Information

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IPC IPC(8): H04B7/0408H04B7/06
CPCH04B7/0408H04B7/0617H04B7/0639
Inventor 禹宏康赵玉萍屈婉月管鹏鑫
Owner PEKING UNIV
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