среда, 21 июля 2010 г.

PSK:TETRA - DMO, terminal to terminal connection

TETRA - DMO, terminal to terminal connection
Direct Mode Operation, Br-18000, pi/4 DQPSK


Author: SergUA6
Band Width ~25000-26000 Hz
Baud Rate 18000 Hz
n-Ary (PSK/MPSK) pi/4 DQPSK
Carrier frequency 15639 Hz, in this example only!
RX mode source I/Q record


Sonograms:
pic.1 Generall view

pic. Manipulation speed

pic.3 Getting of carrier frequency

Diagrams:

pic.4 Generall frame structure

Pictures:

pic.5 Constellation


TETRA - DMO, terminal to terminal connection - the mode of direct terminal (mobile stations, phones etc) connection of TETRA standard, without participation of base stations equipment.