Multi-path symbol resistant timing synchronization device
A symbol timing synchronization and anti-multipath technology, applied in the field of communication, can solve the problems of high implementation complexity, synchronization algorithms that cannot be applied to multipath channel conditions, poor timing performance, etc., and achieve simple circuit structure, easy hardware implementation, anti-multipath strong diameter effect
Active Publication Date: 2013-08-21
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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[0002] Under flat fading channel conditions, there are many practical and effective symbol timing synchronization algorithms, such as Gardner algorithm, early-early gate algorithm, etc., but these synchronization algorithms cannot be applied under multipath channel conditions
Most of the symbol timing synchronization algorithms suitable for application in multipath frequency selective fading channel conditions are not suitable for application in single-carrier frequency-domain equalization systems; and most of the symbol timing synchronization algorithms suitable for single-carrier frequency-domain equalization systems use decision feedback structure , high implementation complexity, poor timing performance at low SNR
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[0021] refer to Figure 1 to Figure 3, the present invention includes IQ demodulator 1, matched filter 2-1, 2-2, decimator 3-1, 3-2, frame coarse synchronizer 4, shift register 5, shift register 7, sampling phase coarse Timing unit 6, sampling phase tracking unit 8; as figure 1 as shown, figure 1 It is the electric principle block diagram of the embodiment of the present invention, and the embodiment is according to figure 1 Connect the lines. Among them, the function of IQ demodulator 1 is to demodulate the digital low-IF signal into I road and Q road quadrature baseband oversampled signal; The signal is matched and filtered, and the Q-fold oversampling signal after the matched filter passes through the extractor 3-1, 3-2 to perform Q-fold extraction and then performs coarse frame synchronization, and passes through the shift register 5 to delay and then performs coarse timing of the sampling phase. The third way is to carry out sampling phase tracking after the shift reg...
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The present invention discloses a multipath symbol resistant timing synchronizing device which relates to wideband single carrier modulation continuous communication in communication field and a symbol timing synchronizing device in burst communication. The multipath symbol resistant timing synchronizing device adjusts the timing phase based on the accumulated energy of a plurality of symbol sample values and not the energy of a single symbol sample value. The timing synchronizing of symbol is realized through a blind estimation method in which a coarse symbol timing estimation and a symbol timing tracking are combined. The multipath symbol resistant timing synchronizing device according to the invention has the characteristics of strong multipath resistance, quick synchronizing speed, adaptability for time domain equalization system, adaptability for frequency domain equalization system, full digital circuit realization, etc. The multipath symbol resistant timing synchronizing deviceis especially suitable for being applied for high-speed data communication system of wideband frequency selectively fading wireless channel.
Description
technical field [0001] The invention relates to an anti-multipath symbol timing synchronization device in the field of communication, especially suitable for high-speed single-carrier modulation continuous communication and burst communication systems, time-domain equalization and frequency-domain equalization communication systems of broadband frequency selective fading wireless channels . Background technique [0002] In flat fading channel conditions, there are many practical and effective symbol timing synchronization algorithms, such as Gardner algorithm, early-early gate algorithm, etc., but these synchronization algorithms cannot be applied in multipath channel conditions. Most of the symbol timing synchronization algorithms suitable for application in multipath frequency selective fading channel conditions are not suitable for application in single-carrier frequency-domain equalization systems; and most of the symbol timing synchronization algorithms suitable for sin...
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IPC IPC(8): H04L27/26H04L25/03
Inventor 徐信刘利强宋志群
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP