Method and apparatus for adaptively controlling signals

Details Method and apparatus for adaptively controlling signals Method and apparatus for adaptively controlling signals

2011-01-11

2011-01-11

Anderson, Matthew D (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

C455S063100, C455S067130, C455S101000, C455S080000, C455S088000, C375S267000, C375S295000, C375S296000, C375S285000, C375S297000

Reexamination Certificate

active

07869767

ABSTRACT:
A signal processing system according to various aspects of the present invention includes an excursion signal generator, a scaling system and a filter system. The excursion signal generator identifies a peak portion of a signal that exceeds a threshold and generates a corresponding excursion signal. The scaling system applies a real scale factor to contiguous sets of excursion samples in order to optimize peak-reduction performance. The filter system filters the excursion signal to remove unwanted frequency components from the excursion signal. The filtered excursion signal may then be subtracted from a delayed version of the original signal to reduce the peak. The signal processing system may also control power consumption by adjusting the threshold. The signal processing system may additionally adjust the scale of the excursion signal and/or individual channel signals, such as to meet constraints on channel noise and output spectrum, or to optimize peak reduction. The magnitude threshold, excursion signal and/or individual channel signals may also be adaptively adjusted based on, for example, a channel signal quality such as a noise level specification.

REFERENCES:
patent: 4298871 (1981-11-01), Kennedy et al.
patent: 4301536 (1981-11-01), Favin et al.
patent: 5519530 (1996-05-01), Utsumi
patent: 5646631 (1997-07-01), Arntz
patent: 6104761 (2000-08-01), McCallister et al.
patent: 6236864 (2001-05-01), McGowan et al.
patent: 6356606 (2002-03-01), Hahm
patent: 6366319 (2002-04-01), Bills
patent: 6366619 (2002-04-01), McCallister et al.
patent: 6519244 (2003-02-01), Unno
patent: 6687511 (2004-02-01), McGowan et al.
patent: 6741661 (2004-05-01), Wheatley, III et al.
patent: 6845082 (2005-01-01), Bourget et al.
patent: 6928121 (2005-08-01), MacFarlane Shearer et al.
patent: 6999522 (2006-02-01), Shearer, lll
patent: 7012969 (2006-03-01), Ode et al.
patent: 7099399 (2006-08-01), McCallister
patent: 7295816 (2007-11-01), McCallister
patent: 7342976 (2008-03-01), McCallister
patent: 7551687 (2009-06-01), Ode et al.
patent: 2002/0191705 (2002-12-01), Melsa et al.
patent: 2003/0043895 (2003-03-01), Melsa
patent: 2003/0053562 (2003-03-01), Busson et al.
patent: 2003/0063682 (2003-04-01), Shearer, III
patent: 2003/0063683 (2003-04-01), MacFarlane Shearer et al.
patent: 2003/0086507 (2003-05-01), Kim et al.
patent: 2004/0008795 (2004-01-01), Chu et al.
patent: 2004/0100210 (2004-05-01), Hori et al.
patent: 2004/0266369 (2004-12-01), McCallister
patent: 2004/0266372 (2004-12-01), McCallister
patent: 2005/0163248 (2005-07-01), Berangi et al.
patent: 2005/0226346 (2005-10-01), Ode et al.
patent: 2007/0055505 (2007-03-01), Doclo et al.
Lashkarian, N. et al., “Peak To Average Power Ratio Reduction in multi-band Transmitters; Analysis, Design and FPGA Implementation”, Signal Processing Systems Engineering Xilinx Inc., IEEE Globecom 2005, pp. 2169-2173.
International Preliminary Report on Patentability of PCT/US2007/067388—Date of issuance of this report: Oct. 28, 2008, 10 pages.
International Search Report of PCT/US2007/067388—Date of search: Aug. 28, 2008—2 pages.
Luqing Wang et al., “A Simplified Clipping and Filtering Technique for PAR Reduction in OFDM Systems”, IEEE Signal Processing Letters, vol. 12, No. 6, pp. 453-456 (Jun. 2005).
R.W. Bauml, R. F. H. Fisher, and J.B. Huber, “Reducing the Peak-to-Average Power Ratio of Multi-Carrier Modulation by Selected Mapping,”Electron. Lett., vol. 32, No. 22, Oct. 1996, pp. 2056-2057.
R. van Nee and A. de Wild, “Reducing the Peak-to-Average Power Ratio of OFDM,” Proc. IEEE VTC. '98, May 1998, pp. 2072-2076.
T. May and H. Rohling, “Reducing the Peak-To-Average Power Ratio in OFDM Radio Transmission Systems,” Proc. IEEE VTC '98, May 1998, pp. 2474-2478.
R. O'Neill and L.Lopes, “Envelope Variations and Spectral Splatter in Clipped Multi-carrier Signals,” Proceedings of the PMRC '95, Sep. 1995, pp. 71-75.
J. Armstrong, “New OFDM Peak-to-Average Power Reduction Scheme,”IEEE VTC 2001, May 2001, Rhodes, Greece.
J. Armstrong, “Peak-to-Average Power Reduction in Digital Television Transmitters,” DICTA2002 Conference, Melbourne, Jan. 2002, pp. 19-24.
J. Armstrong, “Peak-to-Average Power Reduction for OFDM by Repeated Clipping and Frequency Domain Filtering,”Electronics Letters, vol. 38, No. 5, Feb. 2002, pp. 246-247.
H.A. Suraweera, K. Panta, M. Feramez and J. Armstrong, “OFDM Peak-to-Average Power Reduction Scheme With Spectral Masking,” Int'l Symposium on Comm Systems Networks and Digital Processing (2004).
J. Armstrong, “PCC-OFDM with Reduced Peak-to-Average Power Ratio,” inIEEE 3Gwireless 2001, May 30-Jun. 2, 2001, San Fransisco, pp. 386-391.
Ray Andraka, “A Survey of CORDIC Algorithms for FPGA-based Computers,” Proceedings of the 1998 ACM/SIGDA Sixth International Symposium on Field Programmable Gate Arrays, Feb. 22-24, 1998, Monteray, CA, pp. 191-200.
M. Lampe and H. Rohling, “Reducing Out-of-Band Emissions Due to Nonlinearities in OFDM Systems,” 49th IEEE Conference on Vehicular Technology, May 16-20, 1999, pp. 2255-2259.
S. Boyd, “Multi-tone Signals with Low Crest Factor,”IEEE Trans. Circuits Systems, vol. 33, Oct. 1986, pp. 1018-1022.
D. Fraser, “Interpolation by the FFT Revisited-an Experimental Investigation,” IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 37, No. 5, May 1989, pp. 665-675.
B.M. Popovic, “Synthesis of Power Efficient Multitone Signals with Flat Amplitude Spectrum,”IEEE Trans. Commun., vol. 39, Jul. 1991, pp. 1031-1039.
X. Li and L.J. Cimini, “Effects of Clipping and Filtering on the Performance of OFDM”,IEEE Communications Letters, vol. 2, No. 5, May 1998, pp. 131-133.
Y.S. Park, S.L. Miller, “The Peak-to-Average Power Ratio Suppression Schemes in DTF Based OFDM,” IEEE VTC-2000, pp. 292-297.
K. Panta and J. Armstrong, “Use of Peak-to-Average Power Reduction Technique in HIPERLAN2 and its Performance in a Fading Channel,” 6thInternational symposium on DSP for Communication Systems, Sydney, Jan. 2002, pp. 113-117.
N. Ermolova, “A Comparison of Two Schemes for Peak-to-Average Power Ratio Reduction in a Multi-Carrier Transmission,” Proc. IEEE ICCSC '02, Jun. 2002, pp. 102-105.
J. Armstrong, “Overcoming the Limitations of OFDM: Reducing Signal Peaks and Third Generation Modulation Techniques,” invited presentation inAustralian Communications Theory Workshop 2003, Melbourne, Australia, Feb. 5-7, 2003.
J. Armstrong, “Data Transmission and Reception in Multi-Carrier Modulation Systems,” Patent Cooperation Treaty Application, May 1999, Publication No. WO 99/62207, available on WWW at http://gb.espacenet.com, Australian patent granted 2003.
J. Armstrong and M. Feramez, “Computationally Efficient Implementation of OFDM Peak-to-Average Power Reduction Technique”, Proceeding of Third International Symposium, on Communication System, Networks and Digital Signal Processing, Stafford, Jul. 2002, pp. 236-239.
Kusha Panta and J. Armstrong, “The Performance of Overlap PCC-OFDM with Error-Correcting Codes,” 6thInternational Symposium on DSP for Communication Systems, Sydney, Jan. 2002, pp. 118-122.

Affiliated with

Also associated with

Rating

Method and apparatus for adaptively controlling signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for adaptively controlling signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for adaptively controlling signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2649643