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Mobile terminal and uplink channel local frequency regulation method

A local oscillator frequency, mobile terminal technology, applied in the resonant circuit with a central processing unit, telephone communication, wireless communication, etc., can solve the problems of base station inability to distinguish, increase bit error rate, multiple access interference, etc.

Inactive Publication Date: 2009-10-28
罗源县产品质量检验所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the TD-LTE communication system, the uplink multiple access scheme adopts Orthogonal Frequency Division Multiple Access (OFDMA for short), and the interval between each subcarrier is generally 12Khz~15Khz. If 15Khz is used, Then the 0.8Khz Doppler frequency shift will cause serious inter-carrier interference for a single user, and will also cause multiple access interference for different users on the receiving side of the base station, reducing system capacity and increasing bit error rate.
In a special multiple access communication system such as OFDMA, the problems caused by Doppler frequency offset on the base station side cannot be handled by the base station, because the signals sent by many users that should be isolated on the frequency band are due to the Doppler frequency shift. And after moving and superimposing each other and arriving at the base station, the base station has no way to distinguish

Method used

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  • Mobile terminal and uplink channel local frequency regulation method
  • Mobile terminal and uplink channel local frequency regulation method
  • Mobile terminal and uplink channel local frequency regulation method

Examples

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Embodiment Construction

[0043] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing, at first introduce the establishment process of the linkage work information table of local oscillator circuit, as follows:

[0044] In this embodiment, before the mobile terminal leaves the factory, such as a mobile phone, it needs to establish the linkage work information of the local oscillator circuit and its frequency reference source when it is in a static state relative to the base station. In this embodiment, four linkage work information tables need to be established. The structure of one of them is shown in Table 1 below, including three operating temperature ranges T of the frequency reference source of the local oscillator circuit and the index Index of the linkage work information table of the corresponding local oscillator circuit and its frequency reference source. The purpose is to find each Linkage work information table corresponding t...

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Abstract

The invention relates to a mobile terminal uplink channel local oscillation frequency regulation method, includes completing regulation of downlink channel local frequency fr by mobile terminal; setting local oscillation frequency control parameter of uplink channel according to the requirement of regulating ft to 2f0-fr, during regulation of local oscillation frequency ft of uplink channel by mobile terminal; wherein f0 is the carrier frequency when signal sent by the base station in the current work channel is not biased. Correspondingly, the invention provides a mobile terminal including alocal oscillation circuit and a frequency reference source thereof, a storage module, a downlink regulation module, a searching module, and an uplink regulation module. The mobile terminal is capableof regulating the carrier frequency on the receiving and transmitting channel respectively according to the moving state, effect of Doppler frequency shift is counteracted, multi-access interference between users can be reduced. Effect to communication system in OFDM multi-access mode is especially outstanding.

Description

technical field [0001] The invention relates to a mobile communication system terminal, namely a mobile terminal, in particular to a mobile terminal and a method for adjusting the local oscillator frequency of an uplink channel thereof. Background technique [0002] Existing mobile communication terminals, that is, mobile terminals, usually include a local oscillator circuit (local oscillator, LO for short), which is used to generate a local frequency reference signal, also called a local oscillator signal. The electromagnetic wave signal is received by the antenna from the air and sent to the low-noise amplifier, and then sent to the mixer together with the frequency reference signal generated by the local oscillator circuit. The mixer uses the local oscillator signal to down-convert the received RF signal. Then the down-converted signal is sent to a subsequent processing unit to complete receiving information. Sending information is processed in the same way as receiving ...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04M1/725H04M1/72448
CPCH04B7/01H03J1/005H04W56/0035
Inventor 黄旭
Owner 罗源县产品质量检验所
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