1 |
COMPATIBILITY OF IRIG-106-00 STANDARDIZED FEHERPATENTED FQPSK WITH OTHER DATA LINKS AND WIDEBAND W-CDMAMcCorduck, James A., Feher, Kamilo 10 1900 (has links)
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / The interoperability of Feher-patented Quadrature Phase Shift Keying (FQPSK) systems with future and legacy data links is discussed in this paper. In particular, the benefits of “forward” interoperability with 3G (3rd Generation) wireless systems such as WCDMA (Wideband Code Division Multiple Access) up to 40 Mchips/sec are highlighted. Other proposals of forward interoperability with future data links include an enhanced, ultra-bandwidth efficient FQPSK and 16-state FQAM (Feher’s Quadrature Amplitude Modulation) architectures. In addition, since FQPSK based systems have been proven in “dual use” systems and extensively tested and evaluated by the Department of Defense (DoD) and NASA, the analysis of “backward” interoperability with legacy data links such as GSM is also included in this paper.
|
2 |
BLIND EQUALIZATION FOR FQPSK AND FQAM SYSTEMS IN MULTIPATH FREQUENCY SELECTIVE FADING CHANNELSGao, Wei, Wang, Shih-Ho, Feher, Kamilo 10 1900 (has links)
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Blind adaptive equalization with application for Non-Linearly Amplified (NLA) quadrature
amplitude modulation (QAM) systems in multipath selective fading channels is presented.
With an offset sampling strategy in the receiver, the proposed blind equalization using
Constant Modulus Algorithm (CMA) exhibits a fast convergent speed for a family of
quadrature modulated systems in NLA and multipath fading channels. Feher’s patented
Quadrature Phase Shift Keying (FQPSK) and Feher’s Quadrature Amplitude Modulation
(FQAM) which correspond respectively to 4-state and 16-state QAM are used due to their
higher Radio Frequency (RF) power and spectral efficiency in NLA channel. It has been
shown that blind adaptive equalization can significantly open the eye signals in multipath
frequency selective fading channels.
|
3 |
SPECTRAL EFFICIENCY OF COMMERCIAL WIRELESS AND TELEMETRY SYSTEMS IS DOUBLED WITH IRIG 106-00 STANDARDIZED FQPSK AND IS QUADRUPLED WITH FQAMFeher, Kamilo 10 1900 (has links)
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / Advances in spectrally efficient Feher’s Quadrature Phase Shift Keying (FQPSK) and Feher‘s
Quadrature Amplitude Modulation (FQAM) patented technologies, commercial and government
“dual-use” FQPSK products and Test & Evaluation (T&E) results are highlighted in this overview
paper. US and international customer requirements/systems, programs and recent deployments and
standardization programs are also described. FQPSK doubles the spectral efficiency of PCM/FM
Telemetry and of Feher patented Gaussian Minimum Shift Keying (GMSK or FGMSK) and of
alternatives, while FQAM quadruples the spectral efficiency of these systems. The predominant focus
of this presentation is on an overview and advances of IRIG 106-00 standardized FQPSK technologies.
FQAM systems will also be described. Use of FQPSK for applications such as telemetry, data links,
clear mode, TDMA ,CSMA and CDMA, OCDMA, WCDMA as well as OFDM – COFDM will be
included in the presentation.
|
Page generated in 0.4936 seconds