Products of BMS company in U.S.

    COFDM (coded orthogonal frequency division multiplexing), is

the world most advanced modulation scheme with great development

potential. Its basic principle is to divide a single digital signal

over 1,000 or more signal carriers simultaneously. Code(C) means

channel-coding adopts the way of cirrocumulus coding with changeable

coding rate so as to meet the demand of protecting important data;

OFD means usage of a large number of carrier (sub-carrier) with the

same delay; M means multi-path data sources spread on the carriers

above intertwined and constitute a channel.

COFDM technique advantage:

 Good at dodging and penetrating, it can be applied to

circumstances where there are obstacles such as downtowns,

suburbs, and buildings.

 Good at transmitting in high speed motion, it can be applied

to vehicle, shipping, helicopter, and unmanned aircraft.

 It can meet the demand of high baud rate data transmitting.

 COFDM is excellent on interference-resisting.

System composition:

Main equipments include antenna, transmitter, and receiver:

 Antenna: including omni-directional ? directional automatic tracking

and large matrix antenna in accordance with the requests of users.

 Transmitter and receiver: frequency 400M -7G , power 1-10W