Title :
On FM demodulators in software defined radios using FPGAs
Author :
Rice, Michael ; Padilla, Marc ; Nelson, Brent
Author_Institution :
Dept. of Electr. & Comput. Eng., Brigham Young Univ., Provo, UT, USA
Abstract :
The use FPGAs to implement sampled-data FM demodulators for software-defined radios that must support ¿legacy waveforms¿ is explored and analyzed. Feed-forward and feedback structures are examined. The best feed-forward structure, in terms of the time/area trade-off, is the arctangent-differentiator structure. The arctangent-differentiator and PLL demodulators have approximately the same time/area product and approximately the same SNR performance. However, the two occupy very different locations in the time/area trade-off space. Relative to the PLL demodulator, the feed-forward demodulator can achieve a much higher clock rate, but requires more area.
Keywords :
demodulators; feedback; feedforward; field programmable gate arrays; phase locked loops; software radio; FM demodulators; FPGA; PLL demodulators; arctangent-differentiator structure; feedback structures; feedforward demodulator; feedforward structures; legacy waveforms; software defined radios; Clocks; Demodulation; Feedback; Feedforward systems; Field programmable gate arrays; Frequency modulation; Phase locked loops; Phase modulation; Signal processing; Software radio;
Conference_Titel :
Military Communications Conference, 2009. MILCOM 2009. IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-5238-5
Electronic_ISBN :
978-1-4244-5239-2
DOI :
10.1109/MILCOM.2009.5379759
