Realization method of selective diversity combining
An implementation method and a selective technology, which is applied in the field of selective diversity combination, can solve the problems of large amount of equipment, regardless of the accurate phase relationship of signals, etc., and achieve the effect of improving the quality of received signals, ensuring reliability, and reducing costs
Active Publication Date: 2016-04-06
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Generally, it is combined before detection, which either requires a large amount of equipment, or is applied to audio and video signals of analog data, and usually does not consider the accurate phase relationship of the signal, so it cannot be fully applied to the diversity reception of digital signals in modern communications. middle
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[0024] refer to figure 1 , the present invention includes a series of processes such as signal-to-noise ratio discrimination, handover condition discrimination, phase judgment, and data splicing.
[0025] A method for realizing selective diversity combining is characterized in that it comprises the following steps:
[0026] (1) The signals received by the two antennas with horizontal diversity enter the two receivers for demodulation to obtain two baseband signals;
[0027] (2) Compare the variance between the two baseband signals and the standard constellation diagram respectively, the variance is defined as the scatter, and use the scatter to estimate the respective signal-to-noise ratios of the two baseband signals;
[0028] The constellation diagram defined by the signal generated by the sending end is regarded as a standard constellation diagram, and the receiving end performs demodulation according to the standard constellation diagram of the sending end, but due to the...
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The invention discloses a realization method of selective diversity combining, and relates to the communication filed and signal receiving and processing technologies in the communication countermeasure field. According to the invention, algorithm modules such as a signal to noise ratio analysis module, a decision criterion performance analysis module and a phase analysis module are provided. Based on independence of dual-path horizontal space antenna receiving signals, and according to the performance of signals demodulated and output by a demodulator after each path of antenna receiving signals is input into the demodulator, the branch output signals high in signal to noise ratio are selected for judgment, so that the signal to noise ratio of the output signals is improved and doubled. According to the invention, the unusable time and signal quality reduction caused by fading are substantially reduced for channels having a serious fading phenomenon, and the receiving performance is effectively improved.
Description
technical field [0001] The invention relates to the signal receiving and processing technology in the communication field and the communication countermeasure field, and is a method for realizing selective diversity combining. It is especially suitable for receiving signals under severe fading channels, analyzing the advantages and disadvantages of two demodulated data, selecting the data with better output performance, and effectively improving the receiving performance. Background technique [0002] There are many methods, devices and devices for multipath signal diversity reception, including maximum ratio combining method, selective combining method, or methods such as switching between non-diversity receiving mode and diversity mode. Generally, it is combined before detection, which either requires a large amount of equipment, or is applied to audio and video signals of analog data, and usually does not consider the accurate phase relationship of the signal, so it canno...
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IPC IPC(8): H04B7/08
CPCH04B7/0857
Inventor 王晓亚郎俊杰吴素丽陈强
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP