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Method and system for obtaining channel parameters based on orthogonal frequency division multiplexing

A channel parameter and orthogonal frequency division technology, applied in the field of wireless communication, can solve the problem of inability to realize real-time estimation of the PNC system channel, and achieve the effects of simple method, system performance, and small amount of calculation.

Active Publication Date: 2020-11-13
TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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Problems solved by technology

Since the signal of the PNC at the relay is a superimposed signal, the existing technology cannot realize real-time estimation of the channel of the PNC system under any order of QAM modulation

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  • Method and system for obtaining channel parameters based on orthogonal frequency division multiplexing
  • Method and system for obtaining channel parameters based on orthogonal frequency division multiplexing
  • Method and system for obtaining channel parameters based on orthogonal frequency division multiplexing

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Embodiment Construction

[0069] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0070] like figure 1 As shown, a method for obtaining channel parameters based on OFDM provided by an embodiment of the present invention, the method includes:

[0071] S1. In the PNC system, each node sends the first communication information to the relay through an uplink;

[0072] Before S1, in some embodiments, it may also include: using M-order quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), denoted as M-QAM, and the information sent by each node is a symbol modulated by M-QAM sequence, and then undergoes OFDM modulation to obtain the first communication information.

[0073] S2. The relay receives second communication information after superimposing the first communication informa...

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Abstract

The invention discloses a method and a system for obtaining channel parameters based on orthogonal frequency division multiplexing. The method comprises the following steps that each node sends firstcommunication information to the relay through an uplink, the relay receives second communication information obtained by superposing the first communication information of all the nodes, the relay position carries out OFDM modulation on the second communication information to obtain a corresponding information sequence; the information sequence is solved by a preset method; estimated channel parameters of the PNC system are obtained; the joint adaptive estimation of the channel parameters in the PNC system using any-order quadrature amplitude-phase modulation is realized, a certain storage space is used, and simple calculation is carried out, so that the real-time estimation of the channel of the PNC system under any-order QAM modulation can be realized, and the method is simple and smallin calculation amount.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and system for obtaining channel parameters based on orthogonal frequency division multiplexing. Background technique [0002] In the case of high-order modulation, the relative phase offset and uplink channel gain are always the most important factors affecting the performance of the PNC (Physical-layer Network Coding) system. One of the main solutions at present is to use belief propagation (Belief Propogation, BP) algorithm for modulation, the algorithm often requires these parameters to be known, but these parameters are often unknown in the actual system. Since the signal of the PNC at the relay is a superimposed signal, the prior art cannot realize real-time estimation of the channel of the PNC system under any order of QAM modulation. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a meth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2695
Inventor 展月英王雪松吴少俊何建华孙扬
Owner TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI