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-0927481 (2007-10-29) |
등록번호 | US7881180 (2011-01-18) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 2 인용 특허 : 546 |
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprising: a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals; a transmitter configured to modulate symbols
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprising: a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals; a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform to the data transmitted by the transmitter; and a controller programmed to multiplex both payload data and control data onto a first carrier of the spectrally overlapping carrier signals.
What is claimed is: 1. A remote communication device using minimum allocations in a multipoint-to-point communication system, the device comprising:at least one symbol mapper that maps data into symbols using quadrature amplitude modulation (QAM) symbol mapping and phase-shift keying (PSK) symbol ma
What is claimed is: 1. A remote communication device using minimum allocations in a multipoint-to-point communication system, the device comprising:at least one symbol mapper that maps data into symbols using quadrature amplitude modulation (QAM) symbol mapping and phase-shift keying (PSK) symbol mapping;a Fast Fourier Transform (FFT) engine that receives a frame of parallel data based on symbol data generated by the symbol mapper, the Fast Fourier Transform (FFT) engine generating a frame of time domain in-phase and quadrature phase data from the symbol data generated by the symbol mapper;at least one converter generating an analog signal based on the stream of time domain in-phase and quadrature phase data;a radio frequency transmitter for transmitting a radio frequency signal based on the analog signal;wherein the radio frequency signal comprises a plurality of orthogonal frequency division multiplexing (OFDM) sub-carriers transmitted by the transmitter, the plurality of OFDM sub-carriers synchronized in time and frequency to combine with OFDM sub-carriers transmitted by at least one other transmitter to form a composite OFDM waveform at a host unit;wherein the minimum bandwidth allocation received by the remote communication device from the host unit for upstream payload comprises at least two OFDM sub-carriers within the composite OFDM waveform available for transmitting the radio frequency signal.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.