A method and system for generating, sending and receiving a preamble signal

A technology of leading signal and receiving method, which is applied in the direction of transmission system, multi-frequency code system, digital transmission system, etc., can solve problems such as large error and peak platform problem, and achieve the effect of increasing accuracy and ensuring accuracy

Active Publication Date: 2020-06-09
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the process of synchronizing by using the cyclically repeated OFDM coincidence or m-sequence as the autocorrelation operation of the preamble signal, there will be a continuous peak, which lasts until one symbol length before the start of the data segment of the preamble signal
Therefore, when using this scheme, the timing position can be determined according to the falling edge of the peak platform. However, due to the multipath characteristics of the channel and the influence of noise, the error in detecting the falling edge of the peak platform will be large
[0010] In order to overcome the peak platform problem caused by the structure of the directly repeated cascaded preamble signal in the autocorrelation operation, a preamble signal structure quoted in DVB-T2 (the second generation European digital terrestrial television broadcasting transmission standard) is proposed

Method used

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  • A method and system for generating, sending and receiving a preamble signal
  • A method and system for generating, sending and receiving a preamble signal
  • A method and system for generating, sending and receiving a preamble signal

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Embodiment 1

[0060] This embodiment discloses a method for generating a preamble suitable for an asynchronous communication system, so as to realize fast establishment of an asynchronous communication link, and perform more accurate timing estimation and frequency offset estimation.

[0061] like figure 1 As shown, the generation method of the preamble signal in this embodiment includes:

[0062] Step S110, generating a first symbol A and a second symbol B;

[0063] The first symbol A and the second symbol B are time-domain basic symbols with the same length, the first symbol A and the second symbol B have better periodic autocorrelation characteristics, and the relationship between the first symbol A and the second symbol B is relatively Good cross-correlation properties.

[0064] In this embodiment, the first symbol A and the second symbol B are generated by a sequence, wherein the generated sequence includes but not limited to: OFDM symbol, m sequence and CAZAC (Const Amplitude Zero A...

Embodiment 2

[0068] This embodiment discloses a method for sending a preamble signal suitable for an asynchronous communication system, specifically as figure 2 shown, including:

[0069] Step S210, generating a first symbol A and a second symbol B;

[0070] The first symbol A and the second symbol B are time-domain basic symbols with the same length, the first symbol A and the second symbol B have better periodic autocorrelation characteristics, and the relationship between the first symbol A and the second symbol B is relatively Good cross-correlation properties.

[0071] In this embodiment, the first symbol A and the second symbol B are generated by a sequence, wherein the generated sequence includes but not limited to: OFDM symbol, m sequence and CAZAC (Const Amplitude Zero Auto-Correlation, constant envelope zero autocorrelation) sequence.

[0072] Step S220, generating a pilot signal P by concatenating at least 2K first symbols A and 2 second symbols B according to [AA...ABB]; wh...

Embodiment 3

[0079] This embodiment discloses a method for receiving a leading signal suitable for an asynchronous communication system, specifically as image 3 shown, including:

[0080] Step S310, receiving a signal from a channel;

[0081] Step S320, performing signal processing on the received signal to obtain the baseband signal y(n);

[0082] Wherein, the signal processing on the received signal includes but not limited to: down-conversion processing, decoding processing, demodulation processing and / or digital-to-analog conversion processing and the like.

[0083] Step S330, intercepting the baseband signal into multiple sequences according to the sliding window;

[0084] The length of the sliding window is related to the length N of the first symbol A and the second symbol B constituting the preamble signal P. In this embodiment, the length of the sliding window is 2N.

[0085] Further, the interception of the baseband signal y(n) starts from the starting position of the baseba...

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Abstract

The invention provides leading signal generation, sending and receiving methods and systems thereof, wherein the methods and the systems are suitable for an asynchronous communication system. The leading signal generation method comprises the following steps of generating first symbols A and second symbols B, wherein the first symbols A and the second symbols B are time-domain symbols with a same length; and arranging at least 2 K first symbols A and the 2 second symbols B in a cascade mode so as to generate a leading signal, wherein the K expresses a search frequency point number. The leading signal receiving method comprises the following steps of receiving a signal from a channel; carrying out signal processing on the received signal so as to acquire a baseband signal; intercepting the baseband signal into a plurality of sequences according to a sliding window; calculating an autocorrelation value corresponding to a plurality of intercepted sequences; and detecting an autocorrelation energy value corresponding to the autocorrelation value according to a preset detection threshold to determine whether to receive the leading signal. In the invention, a receiving end is ensured to be capable of detecting the leading signal, frequency offset estimation precision is guaranteed and timing estimation accuracy is increased.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and system for generating, sending and receiving a leading signal in an asynchronous communication system. Background technique [0002] Shortwave communication refers to a way of long-distance communication through ionospheric reflection within the frequency range of 3MHz to 30MHz. It is the only means to realize non-relay global communication, and has an irreplaceable position in the field of wireless communication. Shortwave communication is widely used in point-to-point and point-to-face transmission applications that require long-distance coverage. [0003] The short-wave communication system communicates by means of ionospheric reflection. Compared with the mobile communication system that uses base station communication, short-wave communication has the advantages of long transmission distance and strong invulnerability. However, factors such as the instabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2692
Inventor 李明齐张身志张想
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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