Title :
Hybrid DS-FH packet acquisition for frequency hopped random multiple access
Author :
Sakr, M. ; Al-Moghazy, A. ; Abou-Bakr, H. ; Fikri, M.
Author_Institution :
Commun. Dept., Mil. Tech. Collage, Cairo, Egypt
Abstract :
Instead of decreasing pulse duty cycle of the synchronization pulse of FH random multiple access (RMA) to decrease the multiple access interference between users in the acquisition stage, we use a PN generator to spread the modulated data before going to the hopped carrier, the transmitter of each user has the same PN generator of the other users but they differ in initial state of shift registers of the PN generator, and this initial state is known only to the desired receiver, so we can use the auto correlation property of the PN generator to overcome the problem of multiple access interference. The results show that our scheme is better than the FH packet acquisition scheme that depends on decreasing pulse duty cycle to decrease multiple access interference.
Keywords :
frequency hop communication; multi-access systems; radiofrequency interference; shift registers; PN generator; acquisition stage; auto correlation property; frequency hopped random multiple access; hopped carrier; hybrid DS-FH packet acquisition; multiple access interference; pulse duty cycle; shift register; synchronization pulse; transmitter; Computers; Generators; Multiple access interference; Protocols; Receivers; Spread spectrum communication; Synchronization; Acquisition; Frequency hopping; PN generator; Random multiple access; multiple access interference;
Conference_Titel :
Electronics, Communications and Computers (JEC-ECC), 2012 Japan-Egypt Conference on
Conference_Location :
Alexandria
Print_ISBN :
978-1-4673-0485-6
DOI :
10.1109/JEC-ECC.2012.6186971