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Radio communication unit and method for calculating frequency shift

A frequency shift and signal technology, applied in the field of frequency shift calculation, which can solve the problems that the base station cannot accurately correct the frequency shift and cannot estimate the frequency shift.

Inactive Publication Date: 2009-11-25
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned earlier, if the phase shift exceeds 180°, the phase shift appears as a different phase shift in the opposite direction of rotation, making it impossible to estimate the frequency shift in this wider range
As a result, there is a problem that the base station cannot accurately correct the frequency shift

Method used

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  • Radio communication unit and method for calculating frequency shift
  • Radio communication unit and method for calculating frequency shift
  • Radio communication unit and method for calculating frequency shift

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Embodiment Construction

[0028] The radio communication unit of the present invention has a minimum configuration including: a demodulation section that receives a first signal on the receiving side to demodulate the first signal, restore a baseband signal, wherein a reference signal is included in the first signal and the first signal is transmitted from the transmitting side; a reference signal extraction section that extracts a phase of the reference signal from the baseband signal; a frequency shift calculation section that calculates a phase shift of the reference signal with respect to time, and Calculate the frequency shift of the reception carrier frequency received at the reception side with respect to the transmission carrier frequency transmitted from the transmission side based on the phase shift with respect to time; and an estimation range decision section based on the calculated frequency in the current slot frequency shift to determine the estimation range used in the frequency shift ca...

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Abstract

A radio communication unit includes: a reference-signal extraction section that extracts a phase of a reference signal from a baseband signal; a frequency-shift calculation section that calculates a phase shift of the received reference signal with respect to time, and calculates a frequency shift of the received carrier frequency; and an estimation-range decision section that determines, based on the calculated frequency shift, an estimation range used in the frequency-shift calculation section for estimating the frequency shift in a next slot.

Description

technical field [0001] The present invention relates to a radio communication unit, and more particularly, to a radio communication unit on a reception side that receives a signal transmitted from a transmission side communication unit. The present invention also relates to a method for calculating a frequency shift, and more particularly to a method and a program for calculating a frequency shift of a reception carrier frequency received by a reception side communication unit relative to a transmission carrier frequency transmitted from a transmission side communication unit. Background technique [0002] In a communication system, a frequency shift (or frequency offset) may occur between a transmission carrier frequency transmitted from a mobile station and a reception carrier frequency received by a base station. For example, assuming that the frequency shift between the mobile station and the base station is 1 kHz and the slot length is 0.5 milliseconds (ms), it is obser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/14
CPCH04L2027/0026H04L27/0014H04L27/10
Inventor 友清亮岩崎玄弥
Owner NEC CORP