[특허]Adaptive waveform matching for use in transmitter identification

Adaptive waveform matching for use in transmitter identification 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/00 H04B-007/26
출원번호	US-0611429 (1996-03-06)
발명자 / 주소	Barrere Wm. Gerrit Kaplan Dmitry Green Evan R.
출원인 / 주소	Cellular Technical Services Company, Inc.
대리인 / 주소	Seed and Berry LLP
인용정보	피인용 횟수 : 102 인용 특허 : 0

초록 ▼

A system and method extracts a portion of a transmitted waveform and compares the transmission characteristics of the extracted waveform to determine if they match a stored fingerprint associated with the transmitter, such as a cellular telephone. The system adaptively creates fingerprint data by storing a plurality of waveforms believed to be from a particular transmitter and calculates the variability of the individual transmissions with respect to a composite mean waveform of the transmission characteristics. The system emphasizes the variability between the individual waveforms and the composite mean waveform and determines variability values for each of the individual waveforms in the fingerprint. When the system receives an additional unidentified transmission purported to be from the transmitter with the stored fingerprint, the system determines whether the variability of the unidentified waveform fits within the predetermined margins of variability for the fingerprint. If the variability of the unidentified waveform is less than a predetermined variability threshold, the system considers the waveforms to be a suitable match. The system can adaptively include new waveforms in the fingerprint by determining whether the newly-received transmission characteristics meet a series of criteria for inclusion in the fingerprint. In addition, the system analyzes the newly-received waveform and all waveforms forming the fingerprint to determine if any of the waveforms exceed a predetermined maximum variability value. A waveform that exceeds the maximum variability value is eliminated from the fingerprint. The system is easily automated, thus providing a useful analysis technique for communications network such as cellular telephone systems where a large population of transmitters with similar transmission characteristics are operating at any given time.

대표청구항 ▼

[ What is claimed is:] [1.] A system for the identification of an individual unauthenticated transmitter as an authentic transmitter or an unauthorized transmitter when operating in an environment containing a plurality of similar transmitters, the system comprising:a radio frequency receiver circuit receiving a radio transmission from the unauthenticated transmitter that can be the authentic transmitter or the unauthorized transmitter, said received radio transmission including identification data identifying the unauthenticated transmitter as the authentic transmitter;a demodulator demodulating said received radio transmission to generate a demodulated signal, said demodulated signal including a first unauthenticated response signal;a data storage area which stores a plurality of response waveforms designated as reference waveforms for the authentic transmitter;a norrealizer processor which receives each of said reference waveforms from said data storage area and normalizes each of said reference waveforms, said normalizer processor also receiving and normalizing said first unauthenticated response signal;a mean processor which computes a composite mean waveform from said normalized waveforms;a waveform processor which computes difference values between each of said individual normalized waveforms and said composite mean waveform, said waveform processor applying a weighting function to each of said difference values to generate weighted values and summing each of said weighted values to generate a variability value for each of said individual normalized waveforms, said variability values indicating a variability of each of said individual normalized waveforms from said composite mean waveform, said waveform processor also computing first unauthenticated difference values between said first unauthenticated normalized waveform and said composite mean waveform and applying said weighting function to each of said unauthenticated difference values to generate first unauthenticated weighted values and summing each of said first unauthenticated weighted values to generate a first unauthenticated variability value for said first unauthenticated normalized waveform, said first unauthenticated variability value indicating a variability of said first unauthenticated normalized waveform from said composite mean waveform; anda comparison processor which compares said first unauthenticated variability value to said variability values for said individual reference waveforms to determine whether the unauthenticated transmitter is the authentic transmitter or the unauthorized transmitter.

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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 waveform matching for use in transmitter identification 원문보기

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Adaptive waveform matching for use in transmitter identification 원문보기

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