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Circulation prefix parameter setting method for wireless signal framing

A cyclic prefix and wireless signal technology, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of inter-UE interference, different bandwidth CP time can not be aligned, effective CP length reduction, etc., to avoid blind detection, Simplified baseband processing and simplified settings

Inactive Publication Date: 2008-03-12
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

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  • Circulation prefix parameter setting method for wireless signal framing
  • Circulation prefix parameter setting method for wireless signal framing
  • Circulation prefix parameter setting method for wireless signal framing

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Embodiment Construction

[0031] 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.

[0032] 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 CP...

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Abstract

The present invention relates to a method for setting the cyclic prefix parameter of a wireless signal framing. A minimum band width transmitted by a UE in diplex is determined first, next the reference CP length adopted by the transmitting interface of the UE is established, the CP lengths of the first symbol and the other symbols in a frame are set on the basis of the reference CP length, and then according to different conditions, the sampling points of each symbol in a frame are set. The present invention leads the reservation time of rising and dropping of the CP and the sampling points of the UE with different band width transmitted to be lined up under the same system. The set of the CP keeps relatively uniform in each frame. The parameter set out enables the capability of the multi-path Interference resistance in transmission of each symbol to be maximized. The method avoids the blind detection during the process of random access. When the sampling rate of the UE with different band width adopts a multiple relationship, each CP point under different band width adopt a multiple relationship in proportion, and thus the base band processing process is simplified, and the setting of the air interface is also simplified.

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): H04L27/26H04B1/02
CPCH04L27/2636H04L27/2607H04L27/2662
Inventor 左志松
Owner ZTE CORP
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