[특허]Adaptive equalizer and method for operation at high symbol rates

Adaptive equalizer and method for operation at high symbol rates 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03H-007/30 H03H-007/40
출원번호	US-0061958 (1993-05-17)
발명자 / 주소	Kaufmann John (Palo Alto CA)
출원인 / 주소	Loral Aerospace Corp. (New York NY 02)
인용정보	피인용 횟수 : 38 인용 특허 : 0

초록 ▼

Adaptive equalizers and processing methods wherein data required to implement an adaptation algorithm is sampled at a rate that is significantly lower than the symbol rate. The adaptation algorithm is processed at this reduced rate, in that updated tap coefficients, sample timing errors and symbol clock error signals are computed at this reduced rate. An advantage of the adaptive equalizer and processing method of the present invention is that the adaptation algorithm may be implemented in equipment that operates at a clock rate that is much less then the symbol rate. In particular, the adaptation algorithm may be computed using software that is resident in inexpensive general purpose digital processor, such as a personal computer, for example. A benefit of the adaptive equalizer and processing method of the present invention is that more sophisticated and more effective adaptation algorithms are practical when compared to adaptive equalizers using algorithms that are constrained to operate at higher symbol rates.

대표청구항 ▼

A processing method that provides for adaptive equalization of a quantized baseband waveform, said method comprising the steps of: receiving a quantized baseband waveform; applying the quantized baseband waveform to an equalizer; producing an equalized baseband waveform that are generated at a predetermined symbol clock rate; sampling and holding as many successive baseband samples as there are taps in the equalizer to generate sampled and held waveforms and sampling the equalized baseband waveform; computing updated tap coefficients using the sampled and held waveforms at a predetermined sample clock rate that is substantially less that the symbol clock rate; and feeding back the updated tap coefficients to the equalizer.

이 특허를 인용한 특허 (38)

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Lomp, Gary R., Adaptive vector correlator for spread-spectrum communications.
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Gary R. Lomp, Adaptive vector correlator using weighting signals for spread-spectrum communications.
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Ozluturk, Faith M.; Lomp, Gary R.; Kowalski, John, Apparatus for adaptive reverse power control for spread-spectrum communications.
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Ozluturk,Fatih M.; Lomp,Gary R.; Kowalski,John, Apparatus for initial power control for spread-spectrum communications.
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Lomp, Gary R.; Ozluturk, Faith M.; Kowalski, John, Automatic power control system for a code division multiple access (CDMA) communications system.
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Lomp,Gary; Ozluturk,Fatih; Kowalski,John, Automatic power control system for a code division multiple access (CDMA) communications system.
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Chiba Kenichiro,JPX, Carrier recovery circuit.
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Ozluturk, Fatih M.; Lomp, Gary R., Centroid tracking for spread-spectrum communications.
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Woodward, Mark J.; Viss, Marlin E., Direct determination equalizer system.
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Regis, Robert T., Efficient multichannel filtering for CDMA modems.
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Regis, Robert T., Efficient multichannel filtering for CDMA modems.
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Robert T. Regis, Efficient multichannel filtering for CDMA modems.
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Lomp, Gary R.; Ozluturk, Faith, Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system.
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Zheng Baohua, High speed modem and method having jitter-free timing recovery.
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Ozluturk,Fatih M.; Lomp,Gary R.; Kowalski,John, Initial power control for spread-spectrum communications.
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Prasad Mohit Kishore, Look-ahead LMS technique.
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Belotserkovsky, Maxim B.; Litwin, Jr., Louis Robert, Mechanism for OFDM equalizer tap initialization using an adaptive algorithm.
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Lomp,Gary R., Median weighted tracking for spread-spectrum communications.
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Ozluturk, Fatih; Lomp, Gary R.; Kowalski, John, Method and apparatus for adaptive power control for spread-spectrum communications.
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Hyll, Mattias, Method and apparatus for equalizer updating and sampling rate control.
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Ozluturk, Fatih; Lomp, Gary, Method and subscriber unit for performing power control.
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Andrews Michael S. (Escondido CA), Method and system for controlling an adaptive, blind, fractionally spaced equalizer.
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Ozluturk, Fatih M.; Lomp, Gary R.; Kowalski, John, Method for adaptive forward power control for spread-spectrum communications.
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Ozluturk, Faith M.; Lomp, Gary R.; Kowalski, John, Method for adaptive reverse power control for spread-spectrum communications.
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Ozluturk, Fatih M.; Lomp, Gary R.; Kowalski, John, Method for initial power control for spread-spectrum communications.
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Shiue Dong-Chang ; Ramaswamy Kumar ; Knutson Paul Gothard, Multi-mode equalizer in a digital video signal processing system.
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Kang, Kyu-Min; Shin, Cheol-Ho; Choi, Sung-Woo; Cho, Sang-In; Choi, Sang-Sung; Park, Kwang-Roh, Parallel equalizer for DS-CDMA UWB system and method thereof.
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Shi,Hong, Radio frequency transmitter having translational loop phase equalization.
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Dawid, Herbert; Hillebrand, Matthias; Paul, Steffen; Winkler, Lothar; Zimmermann, Manfred, Receiver and apparatus for receiving a data signal.
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Ding,Lei; Ma,Zhengxiang; Morgan,Dennis Raymond; Zierdt,Michael George, System and method for predistorting a signal using current and past signal samples.
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Quirk, Jay; Brown, Matthew, System and method for transmitter training.
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Ozluturk,Fatih M.; Lomp,Gary R., System for using rapid acquisition spreading codes for spread-spectrum communications.
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Lomp, Gary; Ozluturk, Fatih; Silverberg, Avi, Transferring voice and non-voice data.
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Tokuriki Motofumi (Kawasaki JPX) Ishikawa Katsuya (Kawasaki JPX), Waveform equalizer.
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Werner Jean-Jacques ; Yang Jian, Windowing technique for blind equalization.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Adaptive equalizer and method for operation at high symbol rates 원문보기

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Adaptive equalizer and method for operation at high symbol rates 원문보기

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이 특허를 인용한 특허 (38)

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