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-0927428 (2007-10-29) |
등록번호 | US7881181 (2011-01-18) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 11 인용 특허 : 548 |
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 a plurality of spectrally overlapping carrier signals from at least two of a plurality of remotes, the carrier s
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 a plurality of spectrally overlapping carrier signals from at least two of a plurality of remotes, the carrier signals are modulated using an inverse Fourier transform; a transmitter; a processor coupled to the transmitter, the processor outputs data for transmission to the transmitter, the processor applies an inverse Fourier transform to the data provided to the transmitter; a controller programmed to instruct the transmitter to transmit timing adjustments to the at least two of the plurality of remotes, the timing adjustments instruct the at least two of the plurality of remotes to adjust transmission timing so that transmitted symbols associated with frames of a predetermined multiframe structure are received in sequence from the at least two of the plurality of remotes based on the structure.
What is claimed is: 1. A remote service unit using minimum allocations in a multipoint-to-point communication system, the remote service unit comprising:a transceiver communicatively coupled with a host unit in a multipoint-to-point configuration, the transceiver configured to communicate with the h
What is claimed is: 1. A remote service unit using minimum allocations in a multipoint-to-point communication system, the remote service unit comprising:a transceiver communicatively coupled with a host unit in a multipoint-to-point configuration, the transceiver configured to communicate with the host unit via a composite orthogonal frequency division multiplexing (OFDM) waveform of adjacent spectrally overlapping sub-carriers, wherein the transceiver further includes:at least one converter generating an analog signal based on a stream of time domain in-phase and quadrature phase data; anda radio frequency transmitter for transmitting a radio frequency signal based on the analog signal;a multi-carrier modem coupled to the transceiver and configured to modulate upstream payload data onto a plurality of OFDM sub-carriers transmitted by the transceiver, the multi-carrier modem synchronized with the host unit such that the upstream payload data transmitted by the transceiver and other upstream OFDM signals from other transceivers received at the host unit combine to form the composite OFDM waveform, wherein the multi-carrier modulator further includes:at least one symbol mapper that maps data into symbols using quadrature amplitude modulation (QAM) symbol mapping and phase-shift keying (PSK) symbol mapping; anda Fast Fourier Transform (FFT) engine, between the at least one symbol mapper and the transceiver, that receives a frame of parallel data, the Fast Fourier Transform (FFT) engine generating time domain in-phase and quadrature phase data from the parallel data;wherein the remote unit receives channel allocations from the host unit, wherein whenever a channel allocation is made for transport of upstream payload data, the channel allocation provides a plurality of OFDM sub-carriers.
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