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Signal processing method, device and system

A signal processing device and signal processing technology, applied in the field of communication, can solve problems such as ultra-long-distance difficulty in correct demodulation

Inactive Publication Date: 2012-08-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention is proposed in view of the problem in the related art that the sending end selects the same CP length according to different user types, which leads to the problem that it is difficult to correctly demodulate the ultra-long distance (5-25km). Therefore, the main purpose of the present invention is to provide a Signal processing method, device and system to solve the above problems

Method used

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  • Signal processing method, device and system

Examples

Experimental program
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Embodiment 1

[0051] figure 2 is a flow chart of the signal processing method according to the preferred embodiment 1 of the present invention.

[0052] At the sending end, according to the resource allocation status of the target user, for user m1, a pilot code of the allocated resource length (M1) is generated. The generation of the pilot code can refer to the generation method of the Zadoff-Chu code in the 3Gpp protocol TS 36.211. The generated pilot code with a length of M1 is sent to the resource mapping module.

[0053] Precode the modulated symbols of the user, do the discrete Fourier transform of point M1, and send them to the resource mapping module together with the generated pilot code sequence, where the number of modulated data symbols generated is M1×(N symbol -2×C) / p, 2×C is the number of OFDM symbols not used to transmit user data information, preferably, C=3.

[0054] User m1 is mapped to some OFDM symbols in a subframe, pilot bit information and user data information ar...

Embodiment 2

[0057] image 3 is a flow chart of the signal processing method according to the preferred embodiment 2 of the present invention.

[0058] For user m2 (existing system user), generate the pilot code of the allocated resource length (M2), the generation of the pilot code can refer to the generation method of Zadoff-Chu code in the 3Gpp protocol TS 36.211, and the generated length is M2 The pilot codes are sent to the resource mapping module.

[0059] Precode the modulated symbols of the user, do the discrete Fourier transform of M2 points, and send them to the resource mapping module together with the generated pilot code sequence, where the number of modulated data symbols generated is M2×(N symbol -2), in the existing LTE protocol, for the conventional CP, N symbol =14, for extended CP, N symbol =12.

[0060] Figure 4 It is a schematic diagram of adding cyclic prefix in the time domain of the system transmitter according to the preferred embodiment 2 of the present inve...

Embodiment 3

[0074] Figure 7 is a flow chart of the signal processing method according to the third preferred embodiment of the present invention.

[0075] At the receiving end, the data received by the transmitting end through the wireless channel is calculated according to the N symbol OFDM symbols and increased cyclic prefix length CP 1 Remove the cyclic prefix of received data.

[0076] Perform N-point Fourier transform of the time-domain signal after cyclic prefix removal to the frequency domain.

[0077] According to the frequency domain resource positions mapped by user m1 and user m2 and the positions of data symbols, respectively, extract the received pilot information and user data information of ultra-long coverage users and extract the received pilot information and user data information of regular users;

[0078] Then do channel estimation, perform channel estimation of the pilot bits according to the received pilot information and local pilot information, and calculate th...

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Abstract

The invention discloses a signal processing method, device and system. The signal processing method comprises the steps of: generating a pilot frequency code according to a length of frequency domain resources allocated to a user; mapping the pilot frequency code and data information of the user to a resource block allocated to the user, wherein the quantity of generated user modulation data symbols is M1*(Nsymbol-2*C) / p, wherein Nsymbol represents the quantity of orthogonal frequency division multiplexing (OFDM) symbols in one subframe, M1 represents the length of the frequency domain resources allocated to the user, p represents an integer which is more than or equal to 1, and 2*C represents the quantity of OFDM symbols which are not used for transmitting user data information; converting the mapped frequency domain signal into a time domain signal, and increasing a cyclic prefix; and sending the time domain signal. According to the invention, correct demodulation of over distance (5-25km) can be realized, and coexistence of users in different coverage ranges also can be realized.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a signal processing method, device and system. Background technique [0002] The Long-Term Evolution (LTE for short) project is the largest new technology research and development project launched by the 3rd Generation Partnership Project (3rdGeneration Partnership Project, 3GPP for short) in the past two years. 3rd Generation, referred to as 3G) air access technology. Compared with 3G, LTE has more technical advantages, reflected in higher user data rate, packet transmission, reduced system delay, improved system capacity and coverage, and reduced operating costs. [0003] The LTE downlink transmission scheme adopts Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM has the characteristics of high spectrum utilization and anti-multipath interference. The OFDM system can effectively resist the interference caused by wireless channels. influences. The LTE upli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L5/0048H04L27/2602H04L27/2613
Inventor 李萍
Owner ZTE CORP
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