Sampling frequency offset compensation method based on NG-DSL system

A technology of sampling frequency offset and compensation method, which is applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems that the performance degradation is not obvious, the compensation performance cannot meet the high carrier number, high modulation level, and high precision requirements.
CN105072071AInactive Publication Date: 2015-11-18SYSU CMU SHUNDE INT JOINT RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SYSU CMU SHUNDE INT JOINT RES INST
Publication Date
2015-11-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a sampling frequency offset compensation method based on a NG-DSL system. The method comprises a first step of carrying out phase deviation compensation on a received demodulated signal according to a known estimation frequency offset value and then carrying out constellation judgment, thus to obtain a primarily-compensated receiving signal R2; a second step of calculating ICI Qk of subcarriers; a third step of calculating a corrected demodulated signal Rc=R2-Qk; a fourth step of carrying out phase compensation on Rc and then carrying out constellation judgment to obtain a corrected compensation signal R3; and a fifth step of using the result of R3 as a compensation result and putting the result of R3 into the second step for further calculation of ICI, and repeating the third and fourth steps to obtain more accurate results; performing loop iteration for five times, and using the last corrected compensation result as an ultimate demodulation output signal Rr. ICI of the demodulated signal is removed by a means of loop iteration in a demodulation compensation process, thus to overcome the defect of neglect of ICI influences in a conventional frequency domain compensation method. Through simulated analysis display, performance of the method is raised by 3 to 4 orders of magnitude than the conventional frequency domain compensation method under the condition of small sample value timing synchronism deviation.
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Description

technical field

[0001] The present invention relates to the technical field of sampling frequency synchronization of NG-DSL systems, and more specifically, relates to a new sampling frequency deviation compensation method suitable for NG-DSL systems. Background technique

[0002] With the rapid development of various high-bandwidth Internet services, people's demand for bandwidth is getting higher and higher, which requires higher-speed access technology. As a next-generation DSL technology, NG-DSL access technology can provide a two-way rate exceeding 1Gbps, and will be a key access technology for broadband access networks in the future. NG-DSL mainly adopts OFDM transmission with high carrier number and high QAM modulation level. To realize stable and effective data transmission, sampling frequency offset synchronization technology is required to guarantee.

[0003] In order to achieve better sampling frequency offset synchronization, after obtaining the estimated value o...

Claims

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