Title :
Design and Implementation of Digital LMR Walky-Talky for APCO P25 Phase II
Author :
Kang, Min-Soo ; Chong, Young-Jun ; Yoo, Sung-Jin ; Oh, Seung-Hyeub
Author_Institution :
ETRI, Daejeon
Abstract :
In this paper, digital LMR walky-talky was designed and fabricated for APCO P25 phase II. For linearization of RF transmitter, CFL ASIC was designed and implemented using 0.35 um CMOS process. Using CFL chip, the IMD characteristic of Tx PA was improved more 30 dBc when two-tone was injected and FCC emission mask was satisfied at 35.6 dBm output when modulated signal CQPSK was injected. Reference sensitivity level was -119 dBm, co-channel rejection was 6 dB. Except the adjacent channel rejection, the others were generally satisfied with APCO P25 specifications.
Keywords :
CMOS integrated circuits; application specific integrated circuits; digital radio; land mobile radio; linearisation techniques; quadrature phase shift keying; radio transmitters; APCO P25 phase II; CFL ASIC design; CMOS process; CQPSK signal modulation; Cartesian feedback loop; FCC emission mask; RF transmitter linearization; cochannel rejection; digital LMR walky-talky; land mobile radio; size 0.35 mum; Bandwidth; Baseband; Digital signal processing; Land mobile radio; Phase modulation; RF signals; Radio frequency; Signal processing; Signal processing algorithms; Transceivers;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4554672
