Title :
The command post on the move
Author :
Schilling, Donald L.
Author_Institution :
SCS Telecom Inc., Port Washington, NY, USA
Abstract :
The author describes the operation at 24 Mb/s of a broadband code-division multiple-access (B-CDMA) system employing nonlinear codes for security. Users in this system can transmit toll quality voice using 32-kb/s adaptive delta modulation or data at rates up to T1. The antennas employed are omnidirectional, and the acquisition and tracking systems can follow Doppler shifts to 1 part in 105. Handoff from one base station to another occurs smoothly without loss of data. Experimental results are presented to verify theory. It is shown that such a system by virtue of its 48-MHz bandwidth and the low data rate has a processing gain of approximately 40 dB. Thus, the power spectral density of the transmitted signal is reduced by 40 dB compared to a narrowband transmission. As a result, B-CDMA is inherently LPI (low probability of interception)
Keywords :
code division multiple access; command and control systems; mobile radio systems; spread spectrum communication; 24 Mbit/s; 32 kbit/s; 48 MHz; Doppler shifts; LPI system; acquisition systems; adaptive delta modulation; broadband CDMA system; low probability of interception; movable command post; nonlinear codes; omnidirectional antennas; security; spread-spectrum CDMA; toll quality voice; tracking systems; Bandwidth; Costs; Data security; Delta modulation; Interference; Military communication; Multiaccess communication; Narrowband; Spread spectrum communication; Telecommunications;
Conference_Titel :
Military Communications Conference, 1992. MILCOM '92, Conference Record. Communications - Fusing Command, Control and Intelligence., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0585-X
DOI :
10.1109/MILCOM.1992.244029
