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Transmitting method and receiving method for constant envelope frame synchronization signal

A technology of frame synchronization signal and receiving method, which is applied in the direction of digital transmission system, electrical components, transmission system, etc., and can solve problems such as inability to combine multiple input and multiple output systems, high peak-to-average power ratio of synchronization signals, and large time overhead.

Active Publication Date: 2018-08-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to solve the problems of high peak-to-average power ratio of synchronous signals, large time overhead, and inability to combine multiple-input multiple-output systems

Method used

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  • Transmitting method and receiving method for constant envelope frame synchronization signal
  • Transmitting method and receiving method for constant envelope frame synchronization signal
  • Transmitting method and receiving method for constant envelope frame synchronization signal

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: The generation and synchronization of the frame synchronization signal of the constant envelope of the single-antenna system are as follows:

[0057] Take a {1,-1} sequence with a length of 256, perform MSK modulation on it, set the symbol rate to 4kbit / s, and generate a section of MSK signal. Sampling the MSK signal at a sampling rate of 128kHz to obtain a constant envelope sampling point sequence of 8192 points long At this time M=8192. Will modulated at 1.5kHz to obtain the sequence Will modulated at -1.5kHz to obtain the sequence At this time F=1.5kHz, ΔF=-3kHz. Take ΔN=M+32=8224, that is, stagger seconds in Behind, form a constant envelope frame synchronization signal with a length of 16416 sequence and sequence The 32 sampling points between are set to zero. Will Modulated to carrier F c to send.

[0058] At the receiving end, the sequence Take the conjugate to get the sequence A signal received by the receiver Assume t...

Embodiment 2

[0065] Embodiment 2: The generation of the frame synchronization signal of the constant envelope of the 4x1 antenna system and the embodiment of the synchronization method are as follows:

[0066] Multiple antennas transmit frame synchronization signals, which can improve the anti-fading capability of the frame synchronization method. The four antennas in this example set the same three parameters of ΔF, N, and ΔN, and the F parameters are spaced apart to ensure that the frame synchronization signals of different antennas do not interfere with each other in the spectrum. This method improves the anti-fading ability of time synchronization, but there is a certain degree of ambiguity in frequency synchronization, because when searching for synchronization according to the parameters ΔF, ΔN, since the F parameter has 4 values, there are 4 time-frequency points that may obtain synchronization. The time numbers are the same, but there are 4 frequency numbers. When all the signals p...

Embodiment 3

[0067] Embodiment 3: The embodiment of the generation method of the frame synchronization signal comprising 3 segments is as follows:

[0068] Take a {1,-1} sequence with a length of 256, perform MSK modulation on it, set the symbol rate to 4kbit / s, and generate a section of MSK signal. Sampling the MSK signal at a sampling rate of 128kHz to obtain a constant envelope sampling point sequence of 8192 points long At this time M=8192. Will Modulate on the three frequencies of 1.5kHz, -1.5kHz, and 4.5kHz to obtain three sequences respectively Set these 3 sequences at 0 seconds, Second, Seconds start sending at 3 moments to form a constant envelope frame synchronous sampling signal with a length of 24576 Will Modulated to carrier F c to send.

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Abstract

The invention discloses a transmitting method for a constant envelope frame synchronization signal, comprising the following steps of: respectively modulating a segment of constant envelope sampling point sequence (FORMULA referred) with a sampling rate as FS at a frequency F and a frequency F+deltaF, and respectively obtaining modulated sequence (FORMULA referred) and sequence (FORMULA referred),wherein the sampling point sequence includes M constant envelope sampling points, the transmission time corresponding to the first point of the sequence(FORMULA referred) is (FORMULA referred), the transmission timing corresponding to the first point of the sequence (FORMULA referred) is (FORMULA referred), and the sequences (FORMULAE referred) are combined to obtain the constant envelope frame synchronization signal (FORMULA referred). The synchronization signal provided by the invention has a multi-segment structure, and the number of segments can be controlled and distributed over different frequencies. By using the frequency diversity, the time overhead can be reduced with the same false synchronization or miss synchronization probability compared to other synchronization signals.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a method for transmitting and receiving a constant-envelope frame synchronization signal. Background technique [0002] In communication systems, especially in digital communication systems, time synchronization and frequency synchronization are very critical technologies. Some modulation methods that are sensitive to frequency synchronization accuracy, such as Orthogonal Frequency Division Multiplexing (OFDM), even require nearly precise frequency synchronization. Bias estimation to ensure the orthogonality between subcarriers; time synchronization and frequency synchronization techniques are divided into data-assisted algorithms and non-data-assisted algorithms. The synchronization of general communication systems depends on the sending and receiving of synchronization sequences, and belongs to data-assisted algorithms. This type of algorithm has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2657
Inventor 屈代明刘梦冉
Owner HUAZHONG UNIV OF SCI & TECH
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