90-degree digital phase shift network and linearizer using all-p

Details 90-degree digital phase shift network and linearizer using all-p 90-degree digital phase shift network and linearizer using all-p

1994-03-30

1997-08-05

Ngo, Chuong D.

Boots, shoes, and leggings

G06F 1710

Patent

active

056549091

ABSTRACT:
A 90-degree digital phase shift network includes at least two all-pass digital filters which have a phase difference of 90 degrees therebetween. These digital filters are adapted to receive the same signal. Each of the all-pass digital filters has phase characteristics .theta.(.omega.) given by ##EQU1## where T represents a sampling period, P.sub.i a real number indicative of a filter coefficient, .omega. the angular frequency, m a weight variable, n'=n/2 (n=even number), n'=(n+1)/2 (n=odd number), n an order of a 90-degree digital PSN, m being a positive value other than 1, and satisfying .vertline.2m.omega..vertline./.vertline.P.sub.i .vertline.<1 when .omega.T is sufficiently lower than 1, while satisfying .vertline.-P.sub.i .omega.T.sup.2 .vertline./2m<1 when .omega.T is substantially equal to .pi..

REFERENCES:
patent: 3895321 (1975-07-01), Seidel
patent: 4495643 (1985-01-01), Orban
patent: 4701717 (1987-10-01), Radermacher et al.
patent: 4987378 (1991-01-01), Eggleston et al.
S. Darlington, "Realization of a Constant Phase Difference", Bell Sys. Tech. Jour., vol. XXIX, pp. 94-104 (Jan. 1950).
D.K. Weaver, "Design of RC Wide-Band 90-Degree Phase-Difference Network", Proc. of the I.R.E., pp. 671-676, (Apr. 1954).
D.E. Norgaard, "The Phase-Shift Method of Single Sideband Signal Generation", Proc. of the I.R.E., pp. 1718-1734 (Dec. 1956).
L.R. Rabiner and R.W. Schafer, "On the Behavior of Minimax FIR Digital Hilbert Transformers", Bell Sys. Tech. Jour., vol. 53, No. 2, pp. 363-390 (Feb. 1974).
S. Pei and J. Shyu, "Eigen-Approach for Designing FIR Filters and All-Pass Phase Equalizers with Prescribed Magnitude and Phase Response", IEEE Trans. Circuit & Syst., vol. 39, No. 3, pp. 137-146 (Mar. 1992).
R. Ansari, "Elliptic Filter Design for a Class of Generalized Halfband Filters", IEEE Trans. Acoust. Speech & Signal Processing, vol. ASSP-33, No. 4., pp. 1146-1150 (Oct. 1985).
R. Ansari, "IIR Discrete-Time Hilbert Transformers", IEEE Trans. Acoust. Speech & Signal Proc., vol. ASSP-35, No. 8, pp. 1116-1119 (Aug. 1987).
P.P. Vaidyanathan, P.A. Regalia and S.K. Mitra, "Design of Doubly Complementary IIR Digital Filters Using a Single Complex Allpass Filter, with Multirate Applications", IEEE Trans. Circuit & Syst., vol. CAS-34, pp. 378-388 (Apr. 1987).
N. Murakoshi, E. Watanabe and A. Nishihara, "A Synthesis of Variable IIR Digital Filters", IEICE Trans. Fundamentals, vol. E75-A, No. 3 (Mar. 1992).
S. Hsueh, Y. Baba and S. Takahashi, "Design of Two-Dimensional Digital Fan Filters with Complex Coefficients Using 90-Degree Phase-Difference Network", Jour. of Soc. of Elec. Comm., vol. J68-A, No. 11, pp. 1193-1199 (Nov. 1985).
H. Ochi and D. Yamane, "Design of Digital All-Pass Network Using Lp Norm Estimation and Its Structure Optimizing", Jour. of the Soc. of Elec. Comm., vol. J69-A, No. 12, pp. 1574-1554 (Dec. 1986).
M. Ikehara and S. Takahashi, "Construction of Hilbert Converter Using All-Pass Network with Variable Z.sup.2 ", Tech. Report of the Soc. of Elec. Inform. Comm., vol. CAS-87-151 (1987).
M. Ikehara, H. Tanaka and H. Matsuo, "Design of IIR Hilbert Transformers Using Remez Algorithm", Jour. of the Soc. of Elec. Inform. Comm., vol. J74-A, No. 3, pp. 414-420 (Mar. 1992).
T. Yahagi, "Theory of Digital Signal Processing 2", Corona Publishing Co., Ltd., (Nov. 1985).
K. Daikoku and S. Ogose, "RZ-SSB with Great Immunity to Fading" Tech. Report of the Soc. of Elec. Inform. Comm., CS85-140, (Jan. 1986).
K. Suwa and K. Daikoku, "RZ-SSB Receiver Employing a Low Distortion Linearizer", Tech. Report of the Soc. of Elect. Inform. Comm., CS-86-126 (1986).
K. Daikoku, "Single Sideband for Mobile Radio Communications--RZ-SSB Having Great Immunity from Fading and Interference", Jour. of the Soc. of Elec. Inform. Comm., vol. 73, No. 5, pp. 508-514 (May 1990).
S. Ogose and K. Daikoku, "A Real Zerotransceiver: A Simple Method of Demodulating SSB Signals Without an Envelope", Nippon Telegraph and Telephone Corp. Masashino Elec. Comm. Laboratories, vol. 85, No. 104, pp. 9-16, CS85-30 (1986).
K. Daikoku, S. Ogose and H. Ohdate, "Experiments on Real Zero SSB Transceiver--Demodulation of SSB Without Envelope", Proc. 35th IEEE Veh. Tech. Conf., pp. 183-190 (May 21-23 1985).
K. Suwa and K. Doikoku, "Evaluation of RZ SB Receivers Employing an Improfed Linearizer", IEEE Veh. Tech. Conf., pp. 498-504 (1987).
K. Daikoku, S. Ogose and H. Ohdate, "A Real Zero SSB Transceiver for Land Mobile Radio: A Simple Method of Demodulating SSB Without an Envelope", IEEE Trans. Veh. Tech., vol. VT-35, No. 1, pp. 22-29 (Feb. 1986).
J. Suzuki and K. Yoshiya, "Single Side-Band Communications as Old and New Transmission Techniques", Newsletter from General Lab for Communication (Tsushin Sogo Kenkyujyo Kiho), vol. 34, No. 171, pp. 83-99 (Jun. 1988).

Affiliated with

Also associated with

Rating

90-degree digital phase shift network and linearizer using all-p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 90-degree digital phase shift network and linearizer using all-p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 90-degree digital phase shift network and linearizer using all-p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1079584