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2 Features
2.1 E1 Spread Spectrum Radios
E1 Spread Spectrum Radios is different from the traditional microwave equipment in smaller size, lighter
weight, easy set up and can be conveniently moved from place to place. The main characteristics lie in its
advantageous use of high frequency band microwave transmission, digital process, concise structure, quick
connection and adapt to complex topographical structure. Extensively use in nested mobile phone base
station's interconnection and signal transmission, short distance local connection and urgent communication.
Public and specialized network has large application as well. The present wireless low frequency band is
jam-packed and with the demand to build a quicker communication network, the use of high frequency band
E1 Spread Spectrum Radios becomes especially meaningful.
2.2 Core Technology
The technologies incorporated in E1 Spread Spectrum Radios include:
(1) High frequency microwave RF unit and other related RF components design technique (PA, LNA, MIX,
DUX etc.)
(2) High frequency Synthesizer
(3) High amplifier gain control technique
(4) Advanced QPSK de/modulation
(5) Microwave frame multiplexer
(6) Digital equalizer
(7) FEC:Forward Error Correction
(8) Random N*E1 multiplexer, where N=1~16
(9) Digital cross-connection
(10) Computer monitors and relays
(11) Network management
(12) Digital service
(13) Highly efficient and improved overall design
Audio frequency: Each voice signal is 64kbps. It has 8kHz sample, 8bits-per-sample, A/D and D/A
conversions.
E1 is European Standard. 1*E1 is 30 voice channels, plus a frame control and a signaling i.e. 32*64kbps =
2.048Mbps
2-1
Features
E1 Spread Spectrum Radios
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