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Combined OFDM/OQAM time frequency synchronization method under multipath channel

A time-frequency joint and channel technology, applied in the field of communication, can solve the problems of OFDM/OQAM delay and poor frequency offset estimation performance, and achieve the effect of good estimation performance and good performance

Active Publication Date: 2017-03-22
XIDIAN UNIV +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a joint OFDM / OQAM time-frequency synchronization method under a multipath channel, aiming at solving the problem of poor time delay and frequency offset estimation performance of OFDM / OQAM under a low signal-to-noise ratio multipath channel in non-cooperative communication question

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  • Combined OFDM/OQAM time frequency synchronization method under multipath channel
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  • Combined OFDM/OQAM time frequency synchronization method under multipath channel

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[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the OFDM / OQAM time-frequency joint synchronization method under the multipath channel provided by the embodiment of the present invention includes the following steps:

[0025] S101: Assign different weight values ​​to each subchannel in the OFDM / OQAM system;

[0026] S102: Equivalent the multipath channel model to multiple flat fading subchannel models; then calculate the cyclic accumulation of the received signal;

[0027] S103: Without knowing t...

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Abstract

The invention discloses a combined OFDM / OQAM time frequency synchronization method under a multipath channel. According to the method, different weight values are respectively endowed to each sub channel of an OFDM / OQAM system; a multipath channel model is equivalent to multiple flat fading sub channel models; a cyclic cumulant of a reception signal is calculated; time delay is estimated according to ratios of the cyclic cumulant under different cyclic frequencies, frequency offset is estimated according to ratios of the cyclic cumulant under different time delays, and combined OFDM / OQAM time frequency synchronization during non-cooperative communication under the multipath channel is realized. When a signal to noise ratio is in a range of 0-20dB, fluctuation ranges of mean square errors of time delay and frequency offset are not large, the method is not easily influenced by noise, excellent estimation performance is realized under a low signal to noise ratio; when the signal to noise ratio is in the range of 0-20dB, a time delay estimation mean square error can reach 10-4 order of magnitudes, a normalized frequency offset estimation mean square error can reach 10-2 order of magnitudes, and the method is effective and feasible for non-cooperative communication under the multipath channel.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an OFDM / OQAM time-frequency joint synchronization method under a multipath channel. Background technique [0002] In recent years, the OFDM / OQAM modulation system has high spectrum utilization efficiency due to the lack of cyclic prefix, and the introduction of IOTA filters with excellent time-frequency focusing characteristics, which can resist inter-symbol interference (ISI) and inter-carrier interference ( ICI), has become one of the important technologies in 5G communication. As a multi-carrier modulation system, OFDM / OQAM modulation system is particularly sensitive to synchronization errors, and because it has no cyclic prefix, a good blind synchronization method has become a research hotspot at present. Zhao Yu and others modeled the dual-selection channel as a complex exponential base expansion model, and proved the second-order cyclostationarity of OFDM...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2657H04L27/2662H04L27/2665
Inventor 刘明骞王炬李兵兵
Owner XIDIAN UNIV
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