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Frequency offset estimation method and system for narrowband physical uplink shared channel of wireless comprehensive tester

A technology of physical uplink sharing and wireless comprehensive measuring instrument, which is applied in the field of frequency offset estimation to achieve the effect of expanding the range of frequency offset estimation

Active Publication Date: 2021-07-09
深圳市极致汇仪科技有限公司
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Problems solved by technology

But in the receiving process due to the phase noise caused by the instability of the transmitter and receiver signal generators, or by the Doppler frequency shift f d CFO

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  • Frequency offset estimation method and system for narrowband physical uplink shared channel of wireless comprehensive tester
  • Frequency offset estimation method and system for narrowband physical uplink shared channel of wireless comprehensive tester
  • Frequency offset estimation method and system for narrowband physical uplink shared channel of wireless comprehensive tester

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Embodiment Construction

[0043] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] This example first explains the terms: NB-IOT (Narrow Band Internet of Things) is narrowband Internet of Things, NPUSCH (Narrowband Physical Uplink Shared Channel) is narrowband physical uplink shared channel, OFDM (Orthogonal Frequency Division Multiplexing) is orthogonal frequency division Multiplexing, GSM (Global System for Mobile Communication) is the global mobile communication system, LTE (Long Term Evolution) is long-term evolution, SC-FDMA (Single-carrier Frequency-Division Multiple Access) is single-carrier frequency-division multiple access, ICI (Inter -Carrier Interference) is inter-carrier interference, DUT (Device Under Test) is the device under test or equipment under test, CFO (Carrier Frequency Offset) is the carrier frequency offset, and CP (Cyclic Prefix) is the cyclic prefix.

[0045] It is assumed that ...

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Abstract

The present invention provides a frequency offset estimation method and system for a narrowband physical uplink shared channel of a wireless comprehensive tester. The frequency offset estimation method includes the following steps: step S1, using a narrowband demodulation reference signal to perform frequency offset estimation; step S2, obtaining The initial maximum frequency offset value; step S3, calculate the phase value of the time domain data of the local narrowband demodulation reference signal; step S4, carry out frequency offset compensation to the time domain signal of the received narrowband demodulation reference signal, and calculate the frequency The phase value of the time-domain data of the narrowband demodulation reference signal after offset compensation; step S5, calculate the phase difference between the received narrowband demodulation reference signal and the local narrowband demodulation reference signal; step S6, calculate the phase difference Its variance; Step S7, calculate the final estimated value of frequency offset by the minimum variance value of the variance. The invention enables the wireless comprehensive tester to greatly expand the range of frequency offset estimation on the basis of ensuring the accuracy of frequency offset estimation.

Description

technical field [0001] The present invention relates to a frequency offset estimation method, in particular to a frequency offset estimation method for a narrowband physical uplink shared channel of a wireless comprehensive tester, and to a frequency offset estimation method using the narrowband physical uplink shared channel of a wireless comprehensive tester. biased estimation system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has become the most competitive transmission technology in mobile communication systems due to its high spectrum utilization, strong anti-multipath fading ability and reliable transmission. The high spectrum utilization and transmission reliability of OFDM technology are based on the orthogonality of subcarrier spacing. The existence of carrier frequency offset destroys the orthogonality between subcarriers, resulting in serious subcarrier spacing interference (ICI). The signal-to-noise ratio is lost, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
CPCH04L25/0224H04L27/2657H04L27/266
Inventor 吴帅周英
Owner 深圳市极致汇仪科技有限公司
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