A Calculation Method for DC Component and Judgment Threshold in DMR Communication
A technology of judgment threshold and DC component, which is applied in the direction of DC level restoration device/bias distortion correction, baseband system components, etc., can solve problems such as large calculation deviation of DC component and judgment level, waveform distortion, and inaccurate calculation. Achieve the effect of accurately calculating the judgment threshold, wide application range, and reducing the bit error rate
Active Publication Date: 2016-08-17
天津七一二移动通信有限公司
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[0009] The traditional calculation method is not accurate in the case of low SNR, because the symbol of the synchronization part consists of 12 +3 symbols and 12 -3 symbols, and there are fewer sample points, and in the case of low SNR The waveform is severely distorted, so the calculation deviation of the DC component and the judgment level is relatively large, which in turn causes bit errors
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[0020] In order to understand the present invention more clearly, describe in detail below in conjunction with accompanying drawing and embodiment: refer to figure 1 , figure 1 It is an overall flow chart of the algorithm, which describes the overall operation process of the algorithm of the present invention: in DMR communication, after the DMR baseband signal obtained by demodulation is completed by the synchronization part after the bit synchronization operation, first search the symbol +3 set and -3 set in the synchronization part; Then calculate the position of the central point of the collection through the symbol +3 set and -3 set respectively, and then determine the rough aggregation reference point of the symbol +3 and -3; The aggregation distance threshold determines the fine aggregation reference points of symbols +3 and -3, and then uses the aggregation algorithm to perform fine aggregation calculations, finds the symbol level that meets the requirements in the bur...
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The invention relates to a method for calculating dc components and judgment threshold in DMR communication. In the DMR communication, after bit synchronous operation of baseband signals obtained through demodulation is completed, firstly +3 collection and -3 collection are searched in a synchronous section; the central point positions of the collections are calculated respectively through the +3 collection and the -3 collection, and the rough gather datum point of the +3 collection and the rough gather datum point of the -3 collection are further confirmed; rough gather calculation is carried out later, the fine gather datum point of the +3 collection and the fine gather datum point of the -3 collection are confirmed through the rough gather datum points and set rough gather distance threshold, fine gather calculation is carried out later, a symbol electrical level meeting requirements is found in a burst section, the electrical level accurate value of +3 and the electrical level accurate value of -3 are calculated, and the dc components and the judgment threshold are calculated respectively through the electrical level accurate value of +3 and the electrical level accurate value of -3. Compared with a traditional method, the calculating method can enable the system to calculate the dc components and the judgment threshold more accurately under the communication environment with low signal to noise ratio, further effectively reduces the error rate when small signal communication is carried out, is wide in application range and has popularization value.
Description
technical field [0001] The invention relates to digital mobile wireless communication technology, in particular to a calculation method for DC component and decision threshold in DMR communication. Background technique [0002] Digital Mobile Radio Standard (DMR) is a digital radio standard specially formulated by the European Telecommunications Standards Institute (ETSI) for Professional Mobile Radio (PMR) users. KHz channel spacing and meet future regulatory requirements for 6.25kHz channel equalization. The main purpose is to specify low-complexity, affordable digital systems. DMR provides voice, data and other ancillary services. [0003] DMR adopts a TDMA structure of 2 time slots, each time slot is a 30ms burst (burst), in which the frame synchronization and bit synchronization of the receiving section are completed through the synchronization part in the middle of the burst. The synchronization code group in the synchronization part has a sharp single-peak autocorr...
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IPC IPC(8): H04L25/06
Inventor 郭长勇张键李辉辉张财元时勇
Owner 天津七一二移动通信有限公司