International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California / A new constant envelope modulation scheme for OQPSK, called FQPSK-O, is
presented. This modulation technique is an extension of the Feher Quadrature Shift
Keying (FQPSK) patented technologies, see Ref[l]. This scheme uses cubic spline
interpolation to generate very smooth baseband waveforms in order to increase the
spectral and power efficiency. Being a constant envelope modulation, FQPSK-O can
operate with class C power amplifier without spectrum regrowth. We achieve a more
compact spectrum with comparable bit error rate performance. For example, the spectrum
of FQPSK-O is 25% narrower than that of GMSK with BT(b)=0.3 and FQPSK-1 with
hardlimiter [2] at -40 dB attenuation point. For coherent demodulation under AWGN
channel, FQPSK-O has almost the same BER performance as FQPSK-1 with hardlimiter.
Both of them are better than GMSK with BT(b)=0.3 for BER < 10^-4. In Rayleigh fading
channel, FQPSK-O outperforms GMSK with BT(b)=0.3 by 2 dB. FQPSK-O is an excellent
scheme for wireless and satellite communications which require high spectral and power
efficiency.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/607387 |
| Date | 10 1900 |
| Creators | Lee, Tong-Fu, Wang, Shih-Ho, Liu, Chia-Liang |
| Contributors | University of California, Industrial Technology Research Institute |
| Publisher | International Foundation for Telemetering |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Proceedings |
| Rights | Copyright © International Foundation for Telemetering |
| Relation | http://www.telemetry.org/ |
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