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-0678845 (2007-02-26) |
등록번호 | US7983141 (2011-07-06) |
발명자 / 주소 |
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인용정보 | 피인용 횟수 : 8 인용 특허 : 545 |
A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. The system includes a plurality of remote units and a host unit that includes a demodulator. Each of the remote units transmits an upstream OFDM signal using a multiple access scheme to the host
A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. The system includes a plurality of remote units and a host unit that includes a demodulator. Each of the remote units transmits an upstream OFDM signal using a multiple access scheme to the host unit demodulator using at least one of a plurality of orthogonal tones within an OFDM waveform. The host unit receives the upstream OFDM signals from a plurality of the remote units. Portions of upstream OFDM signals from at least two of the remote units arrive at the host unit at the same time. The host unit demodulator demodulates the portions and the upstream signals from the plurality of remote units arrive at the host unit synchronized in time and frequency within the OFDM waveform.
What is claimed is: 1. A remote service unit for a multiple access OFDM communication system, the remote service unit comprising:a transceiver for receiving an OFDM waveform, the OFDM waveform having references signals distributed throughout, the references signals for adjusting demodulation of the
What is claimed is: 1. A remote service unit for a multiple access OFDM communication system, the remote service unit comprising:a transceiver for receiving an OFDM waveform, the OFDM waveform having references signals distributed throughout, the references signals for adjusting demodulation of the OFDM waveform;an FFT engine coupled to the transceiver, the FFT engine producing frequency domain data samples representing information carried by the OFDM waveform;an FFT engine coupled to the transceiver, the FFT engine producing time domain data samples representing upstream information for transmission by the transceiver on a subset of orthogonal carriers of the OFDM waveform;a mapper that that receives payload data mapped onto an in-phase (I) and quadrature-phase (Q) constellation based on an output from the FFT engine, wherein the mapper maps said payload data into a at least one baseband payload signal; anda controller that receives reference data based on at least one of the reference signals, wherein the controller makes adjustments for demodulating the payload data based on the reference data.
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