Time frequency synchronization unit and method for OFDM system receiver

A time-frequency, synchronization device technology, applied in orthogonal multiplexing system, multi-frequency code system, multiplexing communication and other directions, can solve 1/2Δf phase ambiguity, reduce synchronization accuracy, erroneous frequency offset estimation, etc. problems, to achieve the effect of solving the phase blur problem and improving reliability

Inactive Publication Date: 2012-06-20
FUJITSU LTD
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Problems solved by technology

[0041] Time-varying phase rotation e j2πDRCFOn Destroy the correlation characteristics of the original signal and reduce the synchronization accuracy
[0042] 2. For FCFO estimation, there is a problem of 1 / 2Δf phase ambiguity, that is, when the frequency offset exceeds 1 / 2Δf, the phase will reverse, resulting in wrong frequency offset estimation

Method used

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  • Time frequency synchronization unit and method for OFDM system receiver
  • Time frequency synchronization unit and method for OFDM system receiver
  • Time frequency synchronization unit and method for OFDM system receiver

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Embodiment Construction

[0079] Refer below Figure 4-7 Embodiments of the present invention will be described.

[0080] Figure 4 It is a structural block diagram of the time-frequency synchronization device of the present invention.

[0081] The time-frequency synchronization device of the present invention includes a frequency adjustment unit 401, a frame synchronization unit 402, a symbol synchronization unit 403, an FCFO estimation unit 404, an FFT unit 405, an ICFO estimation unit 406, a preamble symbol detection unit 407, a threshold judgment unit 408, a synchronization estimation unit A valid counter 409 , a frequency offset compensation controller 410 , and a frame synchronization controller 411 . Among them, the functions of the frequency adjustment unit 401, the frame synchronization unit 402, the symbol synchronization unit 403, the FCFO estimation unit 404, the FFT unit 405, the ICFO estimation unit 406, the preamble symbol detection unit 407, and the threshold judgment unit 408 are the...

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Abstract

The invention provides a time frequency synchronization unit and method for an OFDM system receiver. The time frequency synchronization unit comprises a frame synchronization controller, a frequency offset compensating controller and a synchronization estimation effective counter. When the count value of the synchronization estimation effective counter is 0, the frame synchronization controller confirms that frame synchronization is carried out for a received signal. When the count value of the synchronization estimation effective counter is 1, the frame synchronization controller confirms that the frame synchronization is not carried out for a next frame received signal, and the frequency offset compensating controller confirms that the frequency compensation is carried out for the next frame received signal based on a fractional frequency offset which is estimated aiming at the current frame received signal. When the count value of the synchronization estimation effective counter is2, the triggering time is synchronous, and the frequency offset compensating controller confirms that the frequency compensation is carried out for the next frame received signal based on a fractionalmultiple frequency offset and an integral multiple frequency offset, which are estimated aiming at the current frame received signal, so that the frequency synchronization is realized.

Description

technical field [0001] The invention relates to time and frequency synchronization between a receiver and a base station of an OFDM communication system. More specifically, the present invention relates to a time-frequency synchronization device and method for an OFDM system receiver. The time-frequency synchronization device and method can quickly and reliably capture the synchronization of the physical layer, avoiding the impact of frequency offset compensation on time synchronization. influences. Background technique [0002] In mobile-supported OFDM wireless communication systems, the speed and reliability of synchronization are of great significance to the effective realization of the initial network access and handover process of mobile stations. In order to achieve effective communication with the base station, the mobile station first needs to capture the carrier frequency and clock of the base station signal, that is, to obtain physical layer synchronization, and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 王昕王昊田军近藤泰二
Owner FUJITSU LTD
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