Title :
A novel DSP multirate IIR-ALE/DPLL AFC system for mobile SSB-SC communications
Author :
Carter, Alan ; Broadhurst, Anthony
Author_Institution :
Grinaker Electronics, Pretoria, South Africa
Abstract :
Single-sideband (SSB) is an efficient modulation scheme but suffers from frequency difference errors between the transmitter and receiver. To provide a frequency reference a low level pilot, typically -10 dB below the peak envelope power (PEP), is transmitted with the speech signal. The authors describe an automatic frequency control (AFC) system for stationary and mobile single-sideband suppressed carrier (SSB-SC) communications, operating in the 30-400 MHz frequency range. The AFC system forms part of a multirate SSB demodulator architecture and is a combination of an infinite impulse response-adaptive line enhancer (IIR-ALE) and a digital phase locked-loop (DPLL)
Keywords :
IIR filters; adaptive filters; automatic frequency control; demodulators; digital phase locked loops; digital signal processing chips; military communication; mobile radio; 30 to 400 MHz; AFC system; UHF; VHF; adaptive line enhancer; automatic frequency control; digital phase locked-loop; infinite impulse response; mobile SSB-SC communications; multirate SSB demodulator; single-sideband suppressed carrier; Amplitude modulation; Automatic frequency control; Communication system control; Control systems; Demodulation; Digital signal processing; Line enhancers; Mobile communication; Speech; Transmitters;
Conference_Titel :
Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0953-7
DOI :
10.1109/MILCOM.1993.408630
