Frequency offset estimation method and system for narrow-band physical uplink shared channel of wireless comprehensive measuring instrument

A technology of physical uplink sharing and wireless comprehensive tester, 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: 2018-12-18
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 narrow-band physical uplink shared channel of wireless comprehensive measuring instrument
  • Frequency offset estimation method and system for narrow-band physical uplink shared channel of wireless comprehensive measuring instrument
  • Frequency offset estimation method and system for narrow-band physical uplink shared channel of wireless comprehensive measuring instrument

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Embodiment Construction

[0045] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] 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.

[0047] It is assumed that ...

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Abstract

The invention provides a frequency offset estimation method and a system for a narrow-band physical uplink shared channel of a wireless comprehensive measuring instrument. The frequency offset estimation method comprises the following steps: step S1, frequency offset estimation is performed by using a narrow-band demodulated reference signal; step S2, obtaining an initial maximum frequency offsetvalue; step 3, calculating the phase value of the time domain data of the local narrow-band demodulated reference signal; Step S4, performing frequency offset compensation on the time domain signal ofthe received narrow-band demodulated reference signal, and calculating the phase value of the time domain data of the narrow-band demodulated reference signal after frequency offset compensation; step 5, calculating the phase difference between the received narrow-band demodulation reference signal and the local narrow-band demodulation reference signal; Step S6, calculating the variance of the phase difference; Step S7, calculating the final frequency offset estimation value by the minimum variance value of the variance. The invention can ensure the frequency offset estimation accuracy of the wireless comprehensive measuring instrument, and greatly expands the frequency offset estimation range.

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, ...

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Application Information

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Patent Type & Authority Applications(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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