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A method for setting cycle prefix parameter of wireless signal frame

A cyclic prefix and wireless signal technology, applied to radio transmission systems, electrical components, transmission systems, etc., can solve problems such as inter-UE interference, effective CP length reduction, different bandwidth CP time cannot be aligned, etc., to avoid blind detection, baseband Simplified processing and simplified settings

Inactive Publication Date: 2008-01-09
ZTE CORP
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Problems solved by technology

[0011] Since UEs with different transmission bandwidths need to be frequency-division multiplexed into the same frame, and their sampling rates, FFT points and other parameters are different, it may cause different bandwidth CPs to be out of alignment in time
Therefore, the effective CP length is reduced, and even interference between UEs is caused

Method used

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  • A method for setting cycle prefix parameter of wireless signal frame
  • A method for setting cycle prefix parameter of wireless signal frame
  • A method for setting cycle prefix parameter of wireless signal frame

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Embodiment Construction

[0027] The application scenario of the present invention is: a wireless access system, the system uses DFT-S-OFDM signals as uplink wireless transmission multiplexing, and the transmission bandwidths of UEs for uplink access are different, but in multiples.

[0028] When introducing the DFT-S-OFDM signal CP parameter setting method of the present invention, some parameters are introduced first: sampling frequency, time length of the frame, number of symbols, length of symbols (called "blocks") with CP removed, UE in multiplexing The minimum bandwidth for transmission, and the reserved time for falling and rising of the sampling point determined according to the sampling frequency and the minimum bandwidth. The sampling frequency is different according to the transmission bandwidth of the UE. Other parameters are the same for all UEs. Expressed in symbols as: sampling frequency F a / ms, frame length L f ms, and the length (block length) of each symbol in the frame without C...

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Abstract

The method comprises: setting the reference CP length used by the UE transmission port; according to the reference CP length, setting the CP length between first symbol and other symbols in frame; according to different case, setting the sampling point number in each symbol. By the invention, in same system, the UEs with different bandwidths can be aligned during the reserved time of going up and falling down of CP and sampling point; the setting of CP can keep evenly in each frame; the set parameters can make the capacity of anti multipath interference of each symbol maximized. When making the random access, the method avoids the blind test. When the sampling rates of UEs with different bandwidths have multiple-time relation, the point numbers of each CP with different bandwidth also have same multiple-time relation so as to simplify the process of handling the baseband and also simplify the setting of air interface.

Description

technical field [0001] The invention relates to a CP (Cyclic Prefix, cyclic prefix) parameter setting method based on discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM) wireless signal modulation. Background technique [0002] As a single-carrier wireless signal modulation method, DFT spread spectrum orthogonal frequency division multiplexing (OFDM) preprocesses the single-carrier signal through DFT and then maps the output subcarriers to the IFFT input at equal intervals. The result of the IFFT transformation is used as Signal source for transmit modulation. The introduction of the CP further enhances the ability of the system to resist inter-symbol interference (ISI), and at the same time better maintains the orthogonality between subcarriers. [0003] DFT transform: F d = Σ k = 0 D ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04B7/2621
Inventor 左志松
Owner ZTE CORP
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