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Joint channel estimation and decoding method and device based on message propagation algorithm

A message and decoding technology, applied in transmission path sub-channel allocation, baseband system, transmission system, etc., can solve the problem of inability to take into account pilot overhead and channel accuracy.

Active Publication Date: 2020-09-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a joint channel estimation and decoding method and device based on message propagation algorithm to alleviate the technical problem that traditional pilot-based channel estimation cannot take into account pilot overhead and channel accuracy

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  • Joint channel estimation and decoding method and device based on message propagation algorithm
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  • Joint channel estimation and decoding method and device based on message propagation algorithm

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Embodiment 1

[0069] figure 1 is a flowchart of a joint channel estimation and decoding method based on a message propagation algorithm according to an embodiment of the present invention, as shown in figure 1 As shown, the method includes the following steps:

[0070] Step S102, obtain the OFDM signal of the target user; and calculate the weight function of the Gaussian distribution in the current iterative step according to the OFDM signal, and update the mean value and variance of the message transmitted from the function observation node to the channel variable node in the target factor graph according to the weight function, and obtain first mean and first variance;

[0071] In the embodiment of the present invention, it is assumed that there is an OFDMA system with N users, and the number of system subcarriers is K. All sub-carriers are numbered {1, . . . , K}. User n transmits a transmission signal, assuming that user n in the tth time slot is assigned a set of subcarriers as To...

Embodiment 2

[0119] The embodiment of the present invention also provides a joint channel estimation and decoding device based on the message propagation algorithm. The joint channel estimation and decoding device based on the message propagation algorithm is mainly used to implement the message-based The joint channel estimation and decoding method based on the propagation algorithm, the following is a specific introduction to the joint channel estimation and decoding device based on the message propagation algorithm provided by the embodiment of the present invention.

[0120] Figure 7 is a schematic diagram of a joint channel estimation and decoding device based on a message propagation algorithm according to an embodiment of the present invention, as shown in Figure 7 As shown, the joint channel estimation and decoding device based on the message propagation algorithm mainly includes: a calculation update unit 11, a first update unit 12, a generation unit 13, a second update unit 14,...

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Abstract

The invention provides a joint channel estimation and decoding method and device based on a message propagation algorithm. According to the invention, reverse transmission of a sending symbol estimated by a decoder is used as a pilot frequency sequence, the channel estimation precision is greatly improved, pilot frequency overhead is reduced, furthermore, time domain information is converted intoprior frequency domain information, and the information is introduced into the information transmission derivation of the factor graph, so that the channel estimation can fully utilize the existing information, through a Sherman-Morrison matrix expansion formula, matrix inversion involved in the algorithm is converted into iterative operation, the complexity of the algorithm is greatly reduced, and the technical problem that pilot frequency expenditure and channel accuracy cannot be considered at the same time in traditional channel estimation based on the pilot frequency is solved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a joint channel estimation and decoding method and device based on message propagation algorithm. Background technique [0002] Orthogonal frequency-division multiple access (OFDMA) technology has the advantages of high spectrum utilization, anti-multipath interference, anti-frequency selective fading, flexible time-frequency resource allocation, etc., and has been widely used in current communication systems (such as: 3GPP LTE -A / LTE, WLANIEEE 802.11A / b / g, DVB-RCT), has high application value. [0003] Channel estimation is a key technology in the physical layer receiver of wireless communication system. The receiver obtains the information of the wireless channel at the current moment through channel estimation, so as to demodulate the transmitted signal. However, multipath propagation and relative motion make infinite channels exhibit time-varying and frequency...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L5/00
CPCH04L5/0048H04L25/0224H04L25/0242H04L25/0256
Inventor 倪祖耀辛睿匡麟玲张树英刘秉坤
Owner TSINGHUA UNIV