发明名称 |
System and method for communicating data using efficient fast fourier transform (FFT) for orthogonal frequency division multiplexing (OFDM) |
摘要 |
A system communicates data and includes a transmitter for transmitting a communications signal that carries communications data. It includes an efficient modulator for approximating the frequencies of sine/cosine basis waveforms using complex exponential functions and adding and subtracting the complex exponential functions to generate an Orthogonal Frequency Division Multiplexed (OFDM) communications signal as a plurality of N data subcarriers that carry communications data as data symbols. A receiver receives the OFDM communications signal and includes a demodulation circuit for demodulating the OFDM communications signal using logical shifts of multiples +/−2p based on complex exponential functions corresponding to sine/cosine basis waveform approximations to extract amplitude and phase values from a plurality of N data subcarriers as data symbols within the OFDM communications signal. |
申请公布号 |
US8274921(B2) |
申请公布日期 |
2012.09.25 |
申请号 |
US20080060292 |
申请日期 |
2008.04.01 |
申请人 |
MOFFATT CHRISTOPHER D.;MATTSSON ANDERS;PAJUNEN JOHN W.;HARRIS CORPORATION |
发明人 |
MOFFATT CHRISTOPHER D.;MATTSSON ANDERS;PAJUNEN JOHN W. |
分类号 |
H04K1/10 |
主分类号 |
H04K1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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