Adaptive decision feedback filtering system based on constellation restrictions and method
A decision feedback and adaptive technology, applied in baseband system components, shaping networks in transmitter/receiver, etc., can solve the problem of low signal reliability of ADF algorithm
Inactive Publication Date: 2017-08-22
NANJING UNIV OF INFORMATION SCI & TECH
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies in the prior art. It provides an adaptive decision feedback filtering system and method based on constellation constraints. While maintaining low computational complexity, it improves the success probability of signal detection and solves the existing problems. The problem of low signal reliability of the ADF algorithm in the technology
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0061] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0062] Such as figure 1 As shown, the constellation-restricted adaptive decision feedback filtering system of the present invention also includes a reliability decision module 3 and a feedback signal error correction module 4. The known adaptive decision feedback system includes a filter module and a parameter update module 5, and the filtering The filter module includes a forward filter 1 and a reverse filter 2. The filter module filters and equalizes the current input signal r[i] to obtain the estimated signal u k [i];
[0063] Reliability judgment module 3, used for the estimated signal u output by the filter module k [i] Make a reliability judgment; if the judgment result is reliable, the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an adaptive decision feedback filtering system based on constellation restrictions. The system comprises a reliability determination module and a feedback signal correction module. The reliability determination module carries out reliability determination on an estimation signal uk[i] output by a filter module. If a determination result is that the signal is unreliable, the feedback signal correction module is executed to correct the unreliable signal. A group of candidate signals consisting of constellations in a constellation graph A; output signals, obtained through channel transmission, of each group of candidate signals are calculated; a constellation point closest to the signal r[i] in the output signals corresponding to the group of the candidate signals is selected to be the optimal candidate point; the optimal candidate point replaces the uk[i] to be the final detection signal represented in the description; and finally, according to the acquired detection signal represented in the description, parameters of a filter are updated. According to the invention, when the additional calculation complexity is reduced, the reliability of an adaptive signal processor is improved, thereby improving performance of a traditional adaptive filter.
Description
technical field [0001] The present invention relates to the technical field of adaptive decision feedback signal processing, in particular to an adaptive decision feedback filtering system based on constellation restrictions, and also to an adaptive decision feedback filtering method based on constellation restrictions, which can be applied to communication field Automatic equalization, echo cancellation, antenna array beamforming. Background technique [0002] Decision Feedback (DF) is a traditional filtering algorithm that uses the minimum mean square error (MMSE) to effectively reduce inter-channel interference, thereby reducing the error between the transmitted signal and the received signal. The smaller the error, we say the higher the reliability of the transmitted signal. However, when the channel is constantly changing, the DF algorithm needs to correct the filter vector during each signal transmission process, and needs to track the channel data information. This p...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 李鹏胡冬顺冯姣
Owner NANJING UNIV OF INFORMATION SCI & TECH