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   CDMA technology

PURPOSE

    Multi-user radio access system is intended for building wireless “point-to-multipoint” networks and provision of integrated services: communication services and high-speed Internet access.

POTENTIALITIES

  • Connection of up to 2000 subscribers to the system.
  • Network building in areas with unfavourable geography for signal porpagation (mountainous terrain, watery waste etc.).
  • Possibility to extend the system in series and configure it while in service ( PLC technology).
  • Transmission of confidential information without use of additional cryptography algorithms.
  • Building a wireless network with a 30km radius and solution of “last mile” problems.

FEATURES AND ADVANTAGES

CDMA standard.

  • Ensures high noise immunity of the line against both disturbances from other transceiving devices and remirrors arising because of landscape and/or city buildings.
  • Ensures high level of confidentiality of transferred data without use of additional cryptography algorithms.

Intellectual algorithm of adaptive power change.

  • The central station automatically changes  (depending on the distance between Central and Subscriber  Stations) output signal power ensuring in this way high quality of system operation, saving of electric energy and improving electromagnetic compatibility indexes.

RAKE receiver.

  • Ensures serviceability of the system under conditions of multipath signal propagation.

Remote monitoring and control system.

  • Gives the possibility to control any transceiver in the system and remotely analyze the quality of transferred data by means of connection of a PC to the Central station.

SoftwareRadio function.

  • Gives the possibility to programmatically configure the functional parameter set of the RRL as applicable (without any change in the equipment configuration).

Developed in Russia.

  • The developer adapts the equipment according to the requirements of customer and provides after-sales services.

COMPONENTS

  • Central station (CS)
  • Subscriber station (US)

TECHNICAL DATA

General technical data

Frequency range, GHz

3.4-3.6; 5.1 -5.9

Technology

DS-CDMA

Modulation

spread-spectrum modulation

Spectrum width, Hz

5

Duplex

Frequency duplex FDD

Maximum output power, dBm

27

Maximum communication range, km

30

Processing gain, dB

not less than 21

Maximum input signal level, dBm

minus 24

Receiver  sensitivity, R =1-6, dBm

minus 96

Transmission delay (msec)

3

Number of volumetric sectors

from 1 t 6

Number of SS’s (128 Kbit/sec) working in a sector simultaneously

25

Chip rate, bit/sec

4.096

Interfaces of ss

Voice

16,32,64 Kbit/sec

Data

Ethernet 10 Base-T, RS-232

Interfaces of cs

Digital interface

E1(G703) 120 Ohm balanced; E1(G703) 75 Ohm coaxial Ethernet 10 Base-T

Temperature, °

+5...+40

Humidity, %

70

Operating conditions of peripheral module

Temperature, °

-40...+60

Humidity, %

100

Measurements and mass of ss

Digital modem (internal equipment), mm

260 x 180 x 70; 1,2 kg

Power source (internal equipment), mm

180 x 150 x 50; 1 kg

Radio unit (external equipment), mm

220 x 150 x 60; 5 kg

Measurements and mass of cs

Internal equipment

from 3U t 6U Compact PCI

External equipment, mm

22015060; 5 kg

ADVANTAGES OF SUBSCRIBER STATION CONSTRUCTION

GENERAL SCHEMATIC

 

New products

Time-schedule of workshops

Copyright

Copyright © 2012
Nizhny Novgorod Factory named after M.V. Frunze.
All rights reserved.
 
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