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 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0158322 (2011-06-10) |
등록번호 | US-8406115 (2013-03-26) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 1 인용 특허 : 552 |
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.
1. A multi-carrier modem, the modem comprising: a receiver configured to receive a waveform comprising a plurality of spectrally overlapping carrier signals from at least two of a plurality of remote units, wherein the plurality of spectrally overlapping carrier signals are modulated using an invers
1. A multi-carrier modem, the modem comprising: a receiver configured to receive a waveform comprising a plurality of spectrally overlapping carrier signals from at least two of a plurality of remote units, wherein the plurality of 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 value for each of the at least two of a plurality of remote units, the elapsed time value representing an elapsed time between transmitting a ranging signal to a remote unit and receiving a signal from the remote unit in response to the ranging signal;the controller further programmed to reducing any difference between at least two elapsed time values by instructing at least one of the plurality of remote units to adjust a delay. 2. The modem of claim 1, the controller further programmed to instruct the transmitter to transmit an adjustment instruction modulated using the inverse Fourier transform algorithm, the adjustment instruction instructing the at least one of the plurality of remote units to vary a timing of transmissions transmitted from the at least one of the plurality of remote units. 3. The modem of claim 1, the controller further programmed to reducing any difference between at least two elapsed time values based on a target elapsed time value. 4. The modem of claim 3, wherein the target elapsed time value is the same for each of the plurality of remote units. 5. The modem of claim 1, wherein the inverse Fourier transform algorithm is based on one of an inverse Fast Fourier Transform (FFT) algorithm and an inverse Discrete Fourier Transform (DFT) algorithm.
Copyright KISTI. All Rights Reserved.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.