Title :
Direct-sequence spread spectrum system
Author :
Stephens, James P. ; Norman, David M.
Author_Institution :
Wright Lab., Wright-Patterson AFB, Dayton, OH, USA
Abstract :
The authors discuss the construction and evaluation of the performance of a direct-sequence spread spectrum (DSSS) system. The system uses a special type of injection-locked oscillator called a synchronous oscillator for code synchronization. The DSSS system was constructed in a manner that provides a test-bed for demonstrating SS principles and allows researchers to evaluate their own subsystem design concepts. The DSSS system, designed as a one-way link in the 420-450-MHz band, is constructed to operate in accordance with FCC rules and regulations pertaining to the Amateur Radio Service (Part 97). The system directly modulates an FM modulated carrier with the PN code sequence. The criteria used for evaluation are synchronization time, processing gains, and probability of bit-error rate. The receiver lacks good sensitivity. The fundamental concepts of DSSS were evaluated and the measurements agreed favorably with theoretical values
Keywords :
codes; frequency modulation; probability; spread spectrum communication; synchronisation; 420 to 450 MHz; Amateur Radio Service; FCC rules; FM modulated carrier; PN code sequence; UHF; code synchronization; direct-sequence spread spectrum; injection-locked oscillator; one-way link; probability of bit-error rate; processing gains; synchronization time; synchronous oscillator; test-bed; Authorization; Digital modulation; FCC; Frequency synchronization; Ham radios; Injection-locked oscillators; Modulation coding; Radio transmitters; Spread spectrum communication; System testing;
Conference_Titel :
Aerospace and Electronics Conference, 1991. NAECON 1991., Proceedings of the IEEE 1991 National
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-0085-8
DOI :
10.1109/NAECON.1991.165790
