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Method for implementing digital GSM time slot ALC

An implementation method and digital technology, applied in power management, wireless communication, electrical components, etc., can solve the problems of large power difference and inability to correctly reflect the maximum single time slot power

Inactive Publication Date: 2011-02-09
SUNWAVE COMM
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Problems solved by technology

[0003] Since the power of different time slots (burst pulses) of GSM (Global System for Mobile Communications) is different, the power difference is also relatively large. If a long time (more than a single time slot) Power statistics, the obtained is an average power, and cannot correctly reflect the power of the largest single time slot

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  • Method for implementing digital GSM time slot ALC
  • Method for implementing digital GSM time slot ALC
  • Method for implementing digital GSM time slot ALC

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0017] figure 1 It is a schematic diagram of the system principle of the present invention; the system is a part of a digital repeater, including a radio frequency signal attenuator, an analog mixer, an analog / digital converter and an FPGA (Field-Programmable GateArray-field-programmable gate array). The signal passes through these devices in turn, and the ALC algorithm is completed inside the FPGA, and then the control signal is sent to the attenuator.

[0018] The FPGA internal ALC algorithm is mainly divided into two modules - the single slot power statistics module ( figure 2 ), attenuation logic control module ( image 3 ).

[0019] Single slot power statistics module, see figure 2 , the signal mainly passes through: squaring, single-slot power statistics, power comparison, and maximum output power. The specific process is as follows:

[0020] 1....

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Abstract

The invention discloses a method for implementing digital global system for mobile communications (GSM) time slot automatic level control (ALC), which comprises the following steps that: a repeater receives a radio frequency signal and sends into field programmable gate array (FPGA) through an attenuator, an analog frequency mixer and an analog / digital converter, wherein an ALC algorithm in the FPGA comprises two modules, namely a single time-slot power statistics module and an attenuating logic control module; data enters the single time-slot power statistics module to finish power statistics of single time-slot (burst pulse), the maximum time-slot power value is sent into the attenuating logic control module to compare with the maximum and minimum power values permitted by the repeater configured by an upper computer, and whether the attenuation amplitude is increased or not is determined. The method for implementing digital GSM time slot ALC has the advantages of realizing the function of the GSM digital repeater ALC, implementing the ALC algorithm based on the FPGA, controlling an external digital attenuator and fulfilling the aim of limiting the input signal level of the repeater.

Description

technical field [0001] The invention relates to an automatic level control (ALC) method of a repeater, mainly a method for realizing the ALC of a digital GSM time slot. Background technique [0002] As the relay between the base station and the mobile station, the repeater completes the lossless signal transmission from the base station to the mobile station and from the mobile station to the base station. After the gain of the repeater is determined, in order to ensure that the power of the output signal of the repeater is within the range of the allowable transmission power and prevent interference to other signal sources due to excessive signal, it is necessary to have a Certain limiting effect. [0003] Since the power of different time slots (burst pulses) of GSM (Global System for Mobile Communications) is different, the power difference is also relatively large. If a long time (more than a single time slot) For power statistics, the obtained average power cannot cor...

Claims

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Application Information

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IPC IPC(8): H04W52/36H04W88/04H04W52/52
Inventor 金淮东王文元王利强
Owner SUNWAVE COMM
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