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Companding Frequency Shifting GSM Repeater signal amplifier

Companding Frequency Shifting GSM Repeater signal amplifier

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Companding Frequency Shifting Repeater
Product Features
Long distance transmission and complicated landform coverage with powerful penetrability and diffraction
Intermediate frequency can chose from 1500MHz to 250MHz,in 4~8MHZ uplink and downlink wideband, evade interferential frequency via choosing and shifting
Less interference to base station uplink, strong supportability of data service and less influence to E-GPRS downloading rate.
Support Multi-split pattern, and thinks to the small traffic in remote villages, the Multi-split pattern aim at the coverage of blink and weak area, reducing coverage cost
Flexible regulating and testing methods, support net opening、serial port and remote upgrad
Description:
The remote village can’t receive the signal from town base station because of long distance. If we adopt the original signal frequency of 900MHz and 1800MHz, it’s easy to affect by the outside condition and the loss of wireless propagation path is biggish. Also the signal is easy to block off by the complicated Montana landform. So we need a system which uneasy to affect by outside condition and with powerful diffraction to transmit and cover, achieve large-scale wireless communication service to villages.
Direct against the above situation, the Enclave Companding System has researched. It compress the communication signal form wide bandwidth to narrowband via simulate channelized、 band selective or digital channelized, then transmit the signal in long distance. The Enclave Companding System compress the donor signal from 24M bandwidth of 900M band to 4M bandwidth of 150M or 230M band, in remote expand the intermediate frequency to the original 900M band, then cover after linear amplification. The advanced compression and filtering technology debase the device interference to network system. Availably solve the signal coverage problem in hilly, mountainous and silvan areas, also in coverage areas with lean frequency resource.
Product Category: Simulate Companding Channelized Frequency Shifting Repeater、Simulate Companding Band Selective Frequency Shifting Repeater、Digital Companding Channelized Frequency Shifting Repeater
Product Series:
Our products, covering 2G (CDMA450、CDMA800、CDMA1900、GSM、EGSM、GSM1800、GSM1900、DCS、PCS)、3G (WCDMA、UMTS、CDMA2000)、Trunking Communication(TETRA、iDEN、GoTa、GT800、350Mhz Police Communication), Digital TV Communication(CMMB、DVB-H、T-DMB、S-DMB)、Railway Communication System(450MHz Radio Train Dispatch Communication Series、GSM-R Series)、Military Communication、FM Broadcast Communication、Interphone Communication、Marine Communication、Sea Area Coverage Systems, output power can be chose from 0.5W(27dBm)to 60W(48dBm).

Technology Analysis:

1Analysis of Enclave System Relay and Coverage Ability

Enclave System uses VHF band of 150MHz to 230MHz, which compare to GSM900 or GSM1800 band, the radio wave diffraction much stronger, transmission loss much less, and more conformable for signal long distance transmission and coverage under special landform.

1.1Diffraction Analysis:

The Electromagnetic Wave has the characteristic similar to optic wave, so for the large margin of power, even there has barrier in the way, it can also communicate via reflection wave or antenna side lobe in short distance transmission. But in long distance transmission, the way between transceiver antennae must be line of sight out of barrier”.

The calculation formula of Fresnel radius is as follow:

R=0.5*(*D)*0.5

is wavelength3×108 /f(meter)

D is the distance between two antennae.

Therefore, at mountainous area thus non-vision distance propagation environment with many obstacles, the Enclave System has stronger ability to conquer landform environment and transmit.

1.2Space Transmission Loss Analysis














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