Gain calibration method and a terminal
A gain calibration and terminal technology, applied in the field of communication, can solve the problems of reducing production efficiency, terminal measurement value error, increasing cost, etc., to achieve the effect of improving factory efficiency, avoiding production line calibration, and saving storage resources
Inactive Publication Date: 2019-05-14
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology
However, when calibrating, it is only calibrated in the single-carrier business state (the main carrier and the sub-carrier are calibrated separately), and there is no multi-carrier concurrent calibration.
As a result, the GAIN calibration value of the automatic gain control (AGC) gain for downlink reception deviates from the real value when multiple carriers are concurrent, and the measurement value reported by the terminal has a large error, which affects the handover of the terminal and the selection of the cell to reside on. Evaluate mobile performance
[0005] In the prior art, the general solution is to select a high-performance LNA device or add a corresponding protection mechanism in a radio frequency (radiofrequency, RF) chip, but this will increase the cost
Or before the terminal leaves the factory, the production line calibration item for multi-carrier concurrency is added to each terminal, that is, the relevant calibration use cases for multi-carrier concurrency are added, but this increases the time for terminal production line calibration and reduces production efficiency. In addition, the terminal It also requires a large amount of additional storage resources to save the concurrent calibration values of different CA bands, which is very expensive
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[0030] Embodiments of the present application provide a gain calibration method and a terminal, which are used to improve the accuracy of gain calibration of a terminal when multiple carriers are concurrent without increasing production line calibration items when multiple carriers are concurrent.
[0031] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a se...
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The embodiment of the invention discloses a gain calibration method and a terminal, and the method comprises the steps that the terminal obtains a first reference signal, and the first reference signal is a signal subjected to the over-gain processing by the terminal; when the terminal is in a multi-carrier concurrent service state; and the terminal compensates the first reference signal accordingto a calibration error value to obtain a second reference signal, the calibration error value is obtained by performing a multi-carrier concurrent calibration test on a terminal sample and stored inthe terminal before the terminal leaves a factory, and the terminal sample and the terminal are terminals with the same hardware scheme. The gain calibration method and device are used for improving the gain calibration accuracy of a terminal during multi-carrier concurrence on the premise that a production line calibration project during multi-carrier concurrence is not increased.
Description
technical field [0001] The present application relates to the communication field, in particular to a gain calibration method and a terminal. Background technique [0002] When the terminal supports the long term evolution (long term evolution, LTE) carrier aggregation (carrier aggregation, CA) feature, according to the requirements of the third generation partnership project (3rd generation partnership project, 3GPP), the LTE terminal needs to support multiple frequency band combinations. It is mainly divided into intra band (that is, the main carrier and the sub-carrier are in the same band) and inter band (that is, the main carrier and the sub-carrier are in different bands). [0003] For intra Band LTE CA, in order to reduce the cost of the terminal, the main carrier and subcarrier of the RF front-end will multiplex some devices, such as low noise amplifier (LNA) and so on, during the RF design hardware design. Before leaving the factory, the terminal will calibrate the...
Claims
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Inventor 张小康
Owner SPREADTRUM COMM (SHANGHAI) CO LTD