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Joint power allocation, precoding, and decoding method and base station thereof

a power allocation and precoding technology, applied in the direction of electrical apparatus, spatial transmit diversity, diversity/multi-antenna systems, etc., to achieve the effect of improving mse performance, ensuring the performance of mse, and ensuring the performance of mimo-noma systems

Active Publication Date: 2018-09-20
NATIONAL TSING HUA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a method for improving the performance of a MIMO-NOMA system by calculating power allocation factors for each cluster based on minimizing inter-cluster interference. The method iteratively adjusts these factors to achieve better transmission quality. The technical effect of this invention is to provide better performance of the MIMO-NOMA system and better quality of transmission.

Problems solved by technology

Therefore, how to indeed take the advantage of the spatial multiplexing and diversity gains in a MIMO-NOMA system to provide better system performance becomes an important issue in related fields.

Method used

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  • Joint power allocation, precoding, and decoding method and base station thereof
  • Joint power allocation, precoding, and decoding method and base station thereof
  • Joint power allocation, precoding, and decoding method and base station thereof

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Embodiment Construction

[0035]FIG. 1 is a schematic diagram of a downlink multi-cluster large-scale MIMO-NOMA system according to an embodiment of the invention. In the embodiment of the invention, the downlink large-scale MIMO-NOMA system 100 includes a base station 110 and 2K user equipment devices (UEs) divided into K clusters (i.e., clusters C_1, C_2, C K and UEs 1_1, 1_2, . . . , K1, K_2), where K≥1. Transmission ranges of different clusters are not overlapped to each other, and each cluster includes two UEs sharing a same transmitting end spatial correlation matrix. In the invention, it is assumed that global channel state information is known, i.e., information of channel matrix Hk,i (k=1, . . . , K, i=1, 2) between the base station 110 and the 2K UEs is obtained. Besides, the base station 110 is equipped with NT antennas, and each of the UEs 1_1, 1_2, . . . , K_1, K_2 is equipped with NR antennas, where NT>>NR.

[0036]In the present embodiment, the UEs 1_1, 1_2, . . . , K_1, K_2 are, for example, imp...

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Abstract

This invention provides a joint power allocation, precoding, and decoding method and a base station thereof. They are applicable to multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems. The method includes: (1) decomposing the precoder for each cluster into a first precoder and a second precoder; (2) obtaining the mean-squared error (MSE) functions of the decoded signals for all user equipment devices in each cluster; (3) calculating the power allocation factors for each cluster in the case of minimizing the maximum of all the MSE functions in each cluster; and (4) obtaining the second precoder and the decoders for each cluster in the case of minimizing a sum of the MSE functions of the decoded signals for all user equipment devices in all clusters under a total power constraint according to the power allocation factors.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 106108456, filed on Mar. 15, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention relates to a joint power allocation, precoding, and decoding method and a base station using the same that are adapted to a downlink multiple input multiple output non-orthogonal multiple access (MIMO-NOMA) system.Description of Related Art[0003]Along with the development of technology, due to obvious improvement of a non-orthogonal multiple access (NOMA) system in capacity, NOMA has become a promising candidate for the next generation of wireless communication systems.[0004]In a NOMA system, user multiplexing can be implemented in the power domain of the transmitting end, and then the receiving end adopts a successive interfer...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/0426H04B7/04
CPCH04B7/0426H04B7/0465H04B7/0452H04B7/0626H04B7/0617
Inventor WANG, CHIN-LIANGJHENG, JYUN-JHECHEN, JYUN-YU
Owner NATIONAL TSING HUA UNIVERSITY
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