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Orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) system and time frequency synchronization method thereof

A time-frequency, preliminary technology, applied in multi-frequency code system, baseband system components, shaping network in transmitter/receiver, etc., can solve the problem of low capture probability of time offset estimation, and achieve the effect of improving capture probability

Inactive Publication Date: 2013-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0033] The purpose of the present invention is to solve the problem that the acquisition probability of the time offset estimation of the existing OFDM / OQAM system based on the time-frequency joint estimation method based on the frequency domain pilot is low, and proposes an OFDM / OQAM system and its time-frequency synchronization method

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  • Orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) system and time frequency synchronization method thereof
  • Orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) system and time frequency synchronization method thereof
  • Orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) system and time frequency synchronization method thereof

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Embodiment Construction

[0052] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0053] The present invention is mainly realized by following technical means:

[0054] 1. Extend the one-way time-frequency joint estimation method based on the frequency-domain pilot in the traditional OFDM / OQAM system to multi-channel parallel time-frequency joint estimation and select the optimal path according to the maximum a posteriori probability criterion method. First use time offset estimation to obtain a preliminary time offset estimate, and expand it into an adjusted time offset test value sequence including nearby 2L (or less than 2L) time offset test values, and then adjust each of them The final time offset test values ​​correspond to the demodulation and recovery of one path of data respectively, and finally select the path with the smallest bit error rate of the pilot part of the data as the path with accurate timing;

[005...

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Abstract

The invention discloses an orthogonal frequency division multiplexing (OFDM) / offset quadrature amplitude modulation (OQAM) system and a time frequency synchronization method thereof. In the system and the method provided by the invention, a one-step synchronization method of a frequency-domain-pilot-based time frequency joint estimation method in the conventional OFDM / OQAM system is extended into a multi-path parallel time frequency joint estimation method, and comprises the following steps of: first obtaining a primary estimated time offset value by using time offset estimation, and expanding the primary estimated time offset value into a regulated time offset test value sequence; then causing each regulated time offset test value to correspond to the demodulation recovery of a path of data respectively; and finally selecting a path of which the data of a pilot part has the smallest bit error rate as an accurate timing path. Therefore, the acquisition probability of the time offset estimation is greatly improved under the condition of correcting the inaccurate primary estimated time offset value to a great extent.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to an Orthogonal Frequency Division Multiplexing (OFDM / OQAM, Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation) system and a time-frequency synchronization method thereof. Background technique [0002] Due to the continuous improvement of wireless users' requirements for transmission rate, multi-carrier modulation technology has become the mainstream modulation method of wireless communication, such as traditional Orthogonal Frequency Division Multiplexing (CP-OFDM, Cyclic Prefix-Orthogonal Frequency Division Multiplexing) based on cyclic prefix. technology is selected as the key technology in the LTE standard. Compared with CP-OFDM, OFDM / OQAM has higher spectral efficiency and better time-frequency focusing characteristics, and is useful for overcoming inter-symbol interference (ISI, Inter-Symbol Interference) and inter-carri...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 胡苏陈浩武刚李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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