OFDM/OQAM (Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Modulation) system and time frequency synchronization method thereof
A time-frequency synchronization and coarse synchronization technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc. The effect of improving the accuracy and capture probability, and extending the correlation range
Inactive Publication Date: 2011-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[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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[0054] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0055] The present invention is mainly realized by following technical means:
[0056] 1. Extend the one-step synchronization method of the time-frequency joint estimation method based on the frequency domain pilot in the traditional OFDM / OQAM system to two steps, that is, coarse synchronization estimation and fine synchronization estimation, and first use the frequency offset estimation obtained in the coarse synchronization estimation The value is used to compensate the frequency offset of the baseband received signal frame sequence, and then use the compensated signal to perform fine synchronization estimation to obtain the final estimated value of time offset;
[0057] In order to further improve the technical effect, the following measures are taken during the estimation of coarse and fine synchronization:
[0058] Two, when performing s...
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The invention discloses an OFDM / OQAM (Orthogonal Frequency Division Multiplexing / Offset Quadrature Amplitude Modulation) system and a time frequency synchronization method thereof. The time frequency synchronization method comprises the following steps of: a coarse synchronization estimating step for estimating an estimated frequency offset value of a received baseband receiving signal frame sequence; a frequency offset compensating step for compensating the frequency offset of the received base band receiving signal frame sequence by using the estimated frequency offset value obtained by thecoarse synchronization estimating step; a fine synchronization estimating step for estimating an estimated time offset value of r2 (KTS) obtained by the frequency offset compensating step; and a timeoffset compensating step for compensating the time offset of the r2 (kTS) obtained by the frequency offset compensating step by using the estimated time offset value obtained by the fine synchronization estimating step so as to obtain r3 (kTS). In the invention, one-step synchronization is divided into two steps including coarse synchronization and fine synchronization; and the frequency offset of the baseband receiving signal frame sequence is first compensated by using the estimated frequency offset value obtained in the coarse synchronization and then the fine synchronization is carried out by using the compensated signal to obtain a final estimated time offset value so that the influence of CFO (Carrier Frequency Offset) during the fine synchronization is minimized and the time offsetestimation accuracy and the acquisition probability are improved.
Description
technical field [0001] The invention belongs to the technical field of mobile communication, and particularly 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-carrier...
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IPC IPC(8): H04L27/26H04L25/03
Inventor 胡苏陈浩杨刚武刚李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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