Phase tracking method and phase tracking system

A phase tracking and phase technology, applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems of demodulation performance degradation, edge carrier performance impact, etc., and achieve the effect of improving reception performance

Active Publication Date: 2018-07-17
深圳市极致汇仪科技有限公司
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Problems solved by technology

However, since the impact of the residual deviation on each subcarrier is different, the impact of the residual deviation on the edge subcarrier is greater than that of the central subcarrier. If

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Embodiment Construction

[0035] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] In the IEEE802.11 WiFi standard (802.11a / g / n / ac) based on OFDM communication, the entire transmission bandwidth is divided into multiple sub-channels with the same bandwidth and orthogonal to each other to transmit data in parallel.

[0037] In order to complete the demodulation of the received signal, the 802.11a / g / n / ac standard inserts a specific training sequence in the preamble, and the receiving end first performs channel estimation on the received training sequence, and then uses the estimated channel response to receive The signal is equalized.

[0038] Since the channel will change with time, the training sequence in the preamble is used for channel estimation. When the time span between the data symbol and the training sequence is long, the channel has undergone a large change. Therefore, the WiFi system inserts a...

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Abstract

The invention provides a phase tracking method and a phase tracking system. The phase tracking method comprises the steps of: S1, converting a receiving complex signal into amplitude and phase signals; S2, using a difference between a receiving pilot phase and an ideal pilot phase for phase tracking and compensation; S3, achieving carrier phase compensation by estimating the phase difference on respective subcarriers; and S4, converting the phase-compensated data to the receiving complex signal. The method, after the receiving signal is converted into the frequency domain and the balance is completed, converts the signal into the amplitude and phase signals and uses the difference between the receiving pilot phase and the ideal pilot phase for phase tracking and compensation, takes accountof the phase difference between different subcarriers, estimates the phase difference on respective subcarriers and then achieves the phase compensation, and finally restores the data to a complex signal form. The method performs relevant phase compensation on each subcarrier, and finally achieves a purpose of improving receiving performance.

Description

technical field [0001] The invention relates to a channel estimation method based on an OFDM wireless system, in particular to a phase tracking method of a wireless system based on the WiFi802.11a / g / n / ac standard, and to a phase tracking system using the phase tracking method. Background technique [0002] In practical application, the phase tracking based on OFDM wireless system can eliminate the phase rotation caused by the residual bias. However, since the impact of the residual deviation on each subcarrier is different, the impact of the residual deviation on the edge subcarrier is greater than that of the central subcarrier. If the phase tracking does not consider the impact on the edge subcarrier, then the performance of the edge carrier will be affected by Significant impact, its demodulation performance will be worse. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a phase tracking method that takes into...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2695
Inventor 吴帅蒋芜
Owner 深圳市极致汇仪科技有限公司
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