최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0927397 (2007-10-29) |
등록번호 | US7995454 (2011-07-27) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 21 인용 특허 : 547 |
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to receive a waveform comprising spectrally overlapping carrier signals from at least two of a plurality of remotes, wherein the spectrally overl
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to receive a waveform comprising spectrally overlapping carrier signals from at least two of a plurality of remotes, wherein the spectrally overlapping carrier signals are modulated using an inverse Fourier transform algorithm; a transmitter; a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform algorithm to the data provided to the transmitter; a controller programmed to calculate an elapsed time for each of the two remotes, the elapsed time representing a time between transmitting a ranging signal to a remote and receiving a signal from the remote in response to the ranging signal; the controller further programmed to reducing any difference between at least two elapsed times by instructing at least one of the plurality of remotes to adjust a delay.
What is claimed is: 1. A method for quality based assessments of orthogonal channels for remote service units of an OFDM based multiple access system, the method comprising:monitoring a first subset of orthogonal carriers within an OFDM waveform associated with at least one communication channel, wh
What is claimed is: 1. A method for quality based assessments of orthogonal channels for remote service units of an OFDM based multiple access system, the method comprising:monitoring a first subset of orthogonal carriers within an OFDM waveform associated with at least one communication channel, wherein the first subset of orthogonal carriers comprises less than all of the orthogonal carriers within the OFDM waveform;monitoring a second subset of orthogonal carriers within the OFDM waveform associated with at least one communication channel, wherein the second subset of orthogonal carriers includes different orthogonal carriers than the first subset of orthogonal carriers;determining a first quality measurement for the first subset of orthogonal carriers;determining a second quality measurement for the second subset of orthogonal carriers;communicating a notification message regarding the quality measurements for the first subset of orthogonal carriers and the second subset of orthogonal carriers; andadjusting a frequency of upstream carriers of the OFDM waveform to maintain orthogonality within the OFDM waveform.
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