Geometric harmonic modulation (GHM)-digital implementation,申请号US19950407554-传众专利搜索

Geometric harmonic modulation (GHM)-digital implementation

申请公布号：US5519692(A)

申请号：US19950407554

申请日期：1995.03.20

申请公布日期：1996.05.21

申请人：

GENERAL ELECTRIC COMPANY

发明人：HERSHEY, JOHN E.;SAULNIER, GARY J.;HASSAN, AMER A.

分类号：H04B1/69;H04L27/26;(IPC1-7):H04K1/00

主分类号：H04B1/69

摘要：A set of phases defining an 'address' and a 'spreading key' is selected. These are employed in determining a preamble waveform and a traffic waveform. The preamble carrier waveform is a sum of a set of tones each offset by its phase, whereas the traffic carrier waveform is the product of these same offset tones. The tones have frequencies which are geometrically increasing multiples of a fundamental frequency. The phases and magnitudes of the preamble and traffic carrier waveforms are determined and prestored in a transmit and receive unit storage device. An inverse discrete Fourier Transform unit (IDFT) in the transmit unit receives the phase preamble offsets and magnitudes from the storage unit and creates a preamble carrier signal transmitted to the receive unit which determines if the phases match those which it is to listen to. If not, the following message is ignored; if they are, the following message is despread and decoded. IDFT creates a traffic carrier waveform from the traffic phases and magnitudes. Binary information is encoded in the carrier, processed and transmitted to the receive unit. A discrete Fourier Transform unit converts the received signal into phases and magnitudes. A dot product unit determines a dot product of the phase and magnitudes of the received signal and the traffic carrier waveform over a number of frequencies. A decision unit determines a binary message from the dot product.