Pre-coding and power allocation joint optimization method

A joint optimization and precoding technology, applied in the direction of space transmit diversity, diversity/multi-antenna system, radio transmission system, etc., to achieve the effect of performance improvement

Active Publication Date: 2019-04-12
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, in the existing technology, for the joint optimization problem of precoding and power allocation in the mmWave NOMA scenario, only one beam can be optimized

Method used

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  • Pre-coding and power allocation joint optimization method
  • Pre-coding and power allocation joint optimization method
  • Pre-coding and power allocation joint optimization method

Examples

Experimental program
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Embodiment

[0039] In this example, if figure 1 The millimeter-wave NOMA system is shown, and the system conditions are assumed as follows: the base station is equipped with N transmit antennas and K radio frequency chains, and the number of radio frequency chains is much smaller than the number of antennas; the base station transmits K beams simultaneously, and each beam serves two single-antenna users , there are 2K single-antenna users in the scene. Bad users are decoded before good users, and the base station uses analog precoding for beamforming.

[0040] Such as figure 2 Shown is a flowchart of a joint optimization method for precoding and power allocation, and the specific steps include:

[0041] (1) The base station obtains the user's downlink channel information;

[0042] (2) The base station divides the users into two groups, good users and bad users, according to the channel information of the users, and selects one user from the good users and bad users for pairing, and th...

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Abstract

The invention discloses a pre-coding and power allocation joint optimization method in a millimeter wave NOMA multi-beam system down link. The pre-coding and power allocation joint optimization methodcomprises the following steps: (1) a base station obtains downlink channel information of a user; (2) performing grouping pairing on the user according to the obtained downlink channel information ofthe user; (3) designing a set of codebook, and transforming the pre-coding and power allocation joint optimization problem into a convex optimization problem; (4) solving the transformed convex optimization problem through a iteration method and obtaining a selection factor vector and a power allocation factor vector; and (5) constructing a new codeword as a pre-coding matrix using the selectionfactor and the codebook. The invention solves the joint optimization problem of millimeter wave NOMA pre-coding and power allocation in a scenario in which the base station transmits multiple beams, which is more general.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a joint optimization method of precoding and power allocation. Background technique [0002] Today, when the spectrum resources at low frequencies are close to saturation, millimeter wave has gradually attracted people's attention due to its short wavelength and wide frequency bandwidth. The data shows that the data rate of millimeter waves can reach up to gigabits per second when communicating in indoor wireless systems and outdoor fixed systems, and the spectrum resources are very rich. Due to the huge path loss of millimeter waves in free space, a large antenna array composed of a large number of antenna elements is generally used to increase the gain through precoding. Because the millimeter wave antenna array is generally very large, using the traditional digital precoding method will cause a high hardware overhead of the system. In order to reduce the hardware comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04B7/0408H04B7/06H04B7/0426H04B7/04
CPCH04B7/0408H04B7/0426H04B7/043H04B7/0456H04B7/0617
Inventor 姜雪纯冯穗力
Owner SOUTH CHINA UNIV OF TECH
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