Self-adaptive balanced demodulation method and device for GSM (global system of mobile communications)
A technology for adaptive equalization and communication systems, applied in baseband system components, shaping networks in transmitters/receivers, etc. System reception performance, the effect of reducing the amount of demodulation calculation
Inactive Publication Date: 2013-03-27
COMBA TELECOM SYST CHINA LTD
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The traditional GSM equalization demodulation technology uses MLSE (Maximum Likelihood Sequence Estimation) equalization demodulation method with a fixed number of states, but if the channel dispersion length is set too small, it will affect the demodulation performance, if it is set too large It will increase the number of states and lead to an increase in the amount of calculation
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
[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] figure 1 It is a flow chart of the present invention's adaptive equalization demodulation method for GSM communication system, including:
[0026] S101: The channel parameter estimation value obtained according to the channel parameter estimation , to determine the actual channel dispersion length L;
[0027] S102: Utilize the M effective channel parameter estimates selected at the sampling point j' with the maximum power Perform matched filtering on the downsampled signal, when L≤N, use 2 L The MLSE equalization mediation method of each state mediates the matched filtered signal; when L>N, a fixed 2 N The DDFSE equalization mediation method of each state mediates the matched filtered signal, where M is an estimated channel order, and N is a preset di...
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 self-adaptive balanced demodulation method and device for a GSM (global system of mobile communications). The method includes determining actual channel dispersion length L according to channel parameter estimated values acquired by estimating channel parameters; performing matched filtering to a down-sampled signal by M effective channel parameter estimated values selected on a sampling point j' with largest power, and when L is not larger than N, modulating the signal subjected to matched filtering by a DDFSE (delayed decision feedback sequence estimator) balanced modulation method for 2L statuses; and when L is larger than N, modulating the signal subjected to matched filtering by a DDFSE balanced modulation method for fixing 2N statuses, wherein M is an estimated channel order and N is preset dispersion length. The actual dispersion length can be compared with the preset dispersion length, the balanced demodulation method is selected self-adaptively, and accordingly demodulation calculation amount is reduced effectively and receiving performance of a system is guaranteed.
Description
technical field [0001] The present invention relates to the technical field of mobile communication, in particular to an adaptive equalization demodulation method and device for a GSM (Global System of Mobile communication, Global System for Mobile Communication) communication system. Background technique [0002] The GSM communication system is the second generation mobile communication system, which has been widely used all over the world. [0003] In wireless communication baseband transmission, the overall transmission characteristics will deviate from the ideal characteristics, which will cause intersymbol interference, making it impossible for the actual baseband transmission system to fully meet the transmission conditions without intersymbol interference, so intersymbol interference is inevitable. The receiver usually adopts balanced demodulation to eliminate inter-symbol interference and improve the system receiving performance. The traditional GSM equalization dem...
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): H04L25/03H04L25/02
Inventor 付杰尉邓单
Owner COMBA TELECOM SYST CHINA LTD