System and method for communicating data using constant envelope orthogonal Walsh modulation with channelization
First Claim
Patent Images
1. A radio device, comprising:
- a transmitter unit comprisinga modulator configured to generate M-PAM (M-Pulse Amplitude Modulation) communications symbols containing communications data;
a Fast Walsh Transform (FWT) circuit connected to the modulator and configured to receive the communications symbols from the modulator and orthogonally encode and band-spread the communications symbols, or channels, using the Fast Walsh Transform;
a guard time circuit connected to the Fast Walsh Transform circuit and configured to cyclically extend the output of Fast Walsh Transform circuit by a guard time; and
a frequency modulation circuit connected to the guard time circuit and configured to frequency modulate the communications symbols wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of orthogonal waveforms each forming a separate Walsh communications channel.
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Abstract
A radio device includes a transmitter having a modulator for generating M-PAM communications symbols containing communications data. A Fast Walsh Transform circuit orthogonally encodes and band-spreads a communications symbol using the Fast Walsh Transform. A frequency modulation circuit frequency modulates the communications symbols wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of orthogonal waveforms each forming a separate Walsh communications channel.
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Citations
25 Claims
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1. A radio device, comprising:
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a transmitter unit comprising a modulator configured to generate M-PAM (M-Pulse Amplitude Modulation) communications symbols containing communications data; a Fast Walsh Transform (FWT) circuit connected to the modulator and configured to receive the communications symbols from the modulator and orthogonally encode and band-spread the communications symbols, or channels, using the Fast Walsh Transform; a guard time circuit connected to the Fast Walsh Transform circuit and configured to cyclically extend the output of Fast Walsh Transform circuit by a guard time; and a frequency modulation circuit connected to the guard time circuit and configured to frequency modulate the communications symbols wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of orthogonal waveforms each forming a separate Walsh communications channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for communicating data, comprising:
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a transmitter comprising a modulator configured to generate M-PAM (M-Pulse Amplitude Modulation) communications symbols, or channels, containing communications data; a Fast Walsh Transform (FWT) circuit connected to the modulator and configured to receive the communications symbols from the modulator and orthogonally encode and band-spread the communications symbols using the Fast Walsh Transform; a guard time circuit connected to the Fast Walsh Transform circuit and configured to cyclically extend the output of Fast Walsh Transform circuit by a guard time; a frequency modulation circuit connected to the guard time circuit and configured to frequency modulate the communications symbols, or channels, wherein a constant envelope orthogonal Walsh modulated communications signal is generated having a plurality of orthogonal waveforms each forming a separate Walsh communications channel; an antenna through which the constant envelope orthogonal Walsh modulated communications signal is transmitted; and at least one receiver remote from the transmitter that receives the constant envelope Walsh modulated communications signal and comprising at least one of a phase demodulator circuit configured to phase demodulate the received signal, a phase unwrap circuit configured to phase unwrap the received signal, a guard time removal circuit and a FWT circuit configured to perform a Fast Walsh Transform as a demodulator matched filter to obtain any communications data that had been transmitted from the transmitter and contained within the at least one received Walsh communications channel. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of communicating data, comprising:
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generating M-PAM (M-Pulse Amplitude Modulation) communications symbols containing communications data; receiving the modulated communications symbols and orthogonally encoding and band-spreading the communications symbols using a Fast Walsh Transform; cyclically extending the Fast Walsh Transform output by a guard time; frequency modulating the communications symbols to generate a constant envelope orthogonal Walsh modulated communications signal having a plurality of orthogonal waveforms each forming a separate Walsh communications channel; and transmitting the constant envelope orthogonal Walsh modulated communications signal to at least one receiver. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification