Series generating system and method, transmitting and synchronizing method and power regulating system

A sequence generation and sequence technology, applied in the field of OFDM, can solve the problems of small carrier frequency offset estimation range and inaccurate accuracy of time synchronization, and achieve the effect of improving accuracy

Inactive Publication Date: 2007-06-13
HUAWEI TECH CO LTD
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  • Abstract
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Problems solved by technology

[0010] To sum up, the accuracy of time synchronization and carrier frequency offset estimation in the current OFDM system in OFDM is not accurate enough, and the range of carrier frequency offset estimation is small

Method used

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  • Series generating system and method, transmitting and synchronizing method and power regulating system
  • Series generating system and method, transmitting and synchronizing method and power regulating system
  • Series generating system and method, transmitting and synchronizing method and power regulating system

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Embodiment Construction

[0080] A synchronous pilot sequence is composed of two or more sub-synchronous pilot sequences, and each sub-synchronous pilot sequence contains two parts, one of which is a number of narrowband components, and the spectral lines shown by the narrowband components It is: several continuous spectral lines with higher amplitude on the discrete spectrum; some of them are several broadband components, and the spectral lines shown by the broadband components are: several continuous spectral lines with lower amplitude on the discrete spectrum. The respective sub-synchronization pilot sequences are identical. And, the frequency spacing between the center frequencies of the sub-synchronization pilot sequence narrowband components can be greater than the coherent bandwidth of the channel, and the frequency spacing between the center frequencies of the narrowband components can also be unequal intervals, preferably, the narrowband components include Several discrete spectral lines with ...

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Abstract

The system includes series-parallel conversion unit, mapping unit, IFFT / IDFT unit, and parallel-series conversion unit. The system also includes parts: baseband signal sequence (BSS) generation unit in use for generating BSS; power regulation unit in use for multiplying baseband signal by different coefficients so that amplitudes of discrete spectrums corresponding to part of BSS are higher than amplitudes of discrete spectrums corresponding to another part of baseband signal sequence; MUX unit in use for multiplexing BSS output from the power regulation unit to a route of data transferred to the series-parallel conversion unit. The invention also discloses method for generating synchronous pilot carrier sequence, method for realizing synchronization, power regulation system for BSS, and method for sending synchronizing signal. The invention increases precision of time synchronization in OFDM system, and precision for estimating frequency shift of carrier.

Description

technical field [0001] The present invention relates to the field of OFDM technology, in particular to a synchronous pilot sequence generation system and generation method, a method for realizing synchronization thereof, a power adjustment system and a synchronization signal transmission method. Background technique [0002] OFDM is a high-speed transmission technology in a wireless environment. Most of the frequency response curves of wireless channels are non-flat, and the main idea of ​​OFDM technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel . In this way, although the overall channel is non-flat and has frequency selectivity, each sub-channel is relatively flat, and narrowband transmission is performed on each sub-channel, and the signal bandwidth is smaller than the corresponding bandwidth of the channel, so the signal waveform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 杨学志孙卫军杜高科
Owner HUAWEI TECH CO LTD
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