Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1996-03-06
1997-12-16
Tse, Young T.
Pulse or digital communications
Transmitters
Antinoise or distortion
375296, 375284, 375308, 455126, 455127, 330149, 332103, 332160, 332162, 332176, H04B 308, H03F 132
Patent
active
056993838
ABSTRACT:
In a high-power transmitter, an input complex signal is multiplied in a complex multiplier by control signals. The output complex signal from the multiplier is converted to a high frequency signal and amplified by a power amplifier for transmission. The amplitude of the input complex signal is detected to access a memory where amplitude and phase correction values are stored. During a read mode of the memory, a set of amplitude and phase correction values is specified by the detected amplitude and supplied to the complex amplifier as the control signals. During a write mode of the memory, a set of amplitude and phase correction values is specified by a delayed version of the detected amplitude and rewritten with a set of new amplitude and phase correction values. The amplified high frequency signal is down-converted to a low frequency complex signal. The nonlinearity of the power amplifier is determined from a delayed version of the input complex signal and the down-converted complex signal and the new amplitude and phase correction values are produced from the detected nonlinearity and delayed versions of the amplitude and phase correction values which were supplied to the complex multiplier. At intervals, the memory is switched from the read mode to the write mode for updating its contents.
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4462001 (1984-07-01), Girard
patent: 4700151 (1987-10-01), Nagata
patent: 4908840 (1990-03-01), Kakimoto
patent: 5093637 (1992-03-01), Isota et al.
patent: 5107520 (1992-04-01), Karam et al.
patent: 5148448 (1992-09-01), Karam et al.
patent: 5396190 (1995-03-01), Murata
patent: 5404378 (1995-04-01), Kimura
patent: 5486789 (1996-01-01), Palandech et al.
patent: 5524285 (1996-06-01), Wray
Lohtia et al, "Power Amplifier Linearization using Cubic Spline Interpolation", Personal Communication, Freedom Through Wireless Technology, Secaucus, NJ, IEEE, 1993, pp. 676-679.
Patent Abstracts of Japan, vol. 17 No. 317, Jun. 1993.
Feng et al, "A Modified Adaptive Compensation Scheme for Nonlinear Bandlimited Satellite Channels", Countdown to the New Millenium, Phoenix, IEEE, 1991, pp. 1551-1555.
Leyonhjelm et al., "Digital Signal Processing and Direct Conversion for Multichannel Transmitters", IEEE (O-7803-1927-3/94), pp. 494-498, (1994).
NEC Corporation
Tse Young T.
LandOfFree
High-power linear amplification using periodically updated ampli does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-power linear amplification using periodically updated ampli, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-power linear amplification using periodically updated ampli will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-214308