A technique of separating a sequence of modulation shift keying (MSK) symbols into a first portion and a second portion and separately comparing the first portion of the sequence of MSK symbols and the second portion of the sequence of MSK symbols against a first portion of a reference sequence of MSK symbols and a second portion of the reference sequence of MSK symbols allows a low complexity detection of a start field delimiter in a wireless communication packet.

A transmitter 108 and a method therein for transmitting overlaid and underlaid signals to a narrowband receiver 112 and a wideband receiver 110. The transmitter and the receivers operate in a wireless communications network 100. The transmitter generates a narrowband signal carrying data for the narrowband receiver. The narrowband signal is generated by: mapping user code bits of the data to a first set of binary symbols; generating a second set of binary symbols by precoding the first set of binary symbols; rotating the binary symbols of the second set resulting in rotated constellation symbols; and filtering the rotated constellation symbols. Further, the transmitter generates a wideband signal carrying data for the wideband receiver. Furthermore, the transmitter overlays the generated narrowband signal over the generated wideband signal and transmits, to the narrowband receiver and the wideband receiver, the overlaid narrowband signal and the underlaid wideband signal, respectively.

A data communications system and method having high spectral efficiency. The method includes encoding input digital data using a plurality of symbol waveforms. Each symbol waveform occupies a period of a composite encoded waveform and represents one or more bits of the input digital data. Each symbol waveform has a first elliptical segment and a second elliptical segment of opposite polarity. The encoding includes defining each symbol waveform so that (i) a zero crossing from the first elliptical segment to the second elliptical segment of the symbol waveform is different for each of the symbol waveforms, and (ii) an energy of the first elliptical segment of the symbol waveform is substantially equal to an energy of the second elliptical segment of the symbol waveform. An encoded analog waveform is generated, using a digital-to-analog converter, from a digital representation of the composite encoded waveform.

A system and method for waveform modulation includes encoding input digital data at selected phase angles of an unmodulated sinusoidal waveform. The encoding includes selectively reducing a power of the unmodulated sinusoidal waveform at the selected phase angles in accordance with bit values of the input digital data so as to respectively define first, second, third and fourth data notches in the modulated sinusoidal waveform. An encoded analog waveform is then generated from a digital representation of the modulated sinusoidal waveform. The encoding is performed so that energies associated with the first and third data notches are balanced and energies associated with second and fourth data notches are also balanced. Each of the energies corresponds to a cumulative power difference between a power of the unmodulated sinusoidal waveform and a power of the modulated sinusoidal waveform over a phase angle range subtended by one of the data notches.

A data communication method in which input digital data is received and encoded into an encoded waveform having zero crossings representative of the input digital data. The encoding includes generating the encoded waveform based upon a continuous piecewise function having sinusoidal components. The continuous piecewise function may be used in generating a plurality of symbol waveforms, each of which occupies a period of the encoded waveform and represents bits of the input digital data. The plurality of symbol waveforms are defined so that a value of a phase offset used in the continuous piecewise function is different for each of the plurality of symbol waveforms, thereby resulting in each symbol waveform having a different zero crossing. An encoded analog waveform is generated from a representation of the encoded waveform and transmitted to a receiver.

A transmitter 108 and a method therein for transmitting overlaid and underlaid signals to a narrowband receiver 112 and a wideband receiver 110. The transmitter and the receivers operate in a wireless communications network 100. The transmitter generates a narrowband signal carrying data for the narrowband receiver. The narrowband signal is generated by: mapping user code bits of the data to a first set of binary symbols; generating a second set of binary symbols by precoding the first set of binary symbols; rotating the binary symbols of the second set resulting in rotated constellation symbols; and filtering the rotated constellation symbols. Further, the transmitter generates a wideband signal carrying data for the wideband receiver. Furthermore, the transmitter overlays the generated narrowband signal over the generated wideband signal and transmits, to the narrowband receiver and the wideband receiver, the overlaid narrowband signal and the underlaid wideband signal, respectively.

Mobile device for receiving, demodulating and processing, from a cellular base station, a modulated spread spectrum signal into a demodulated spread spectrum signal. Modulating the received, demodulated and processed spread spectrum signal into a modulated Orthogonal Frequency Division Multiplexed (OFDM) signal and transmitting the OFDM modulated signal in a digital communications wireless Network. Processing, in a mobile device, a fingerprint signal for authenticating use of the mobile device, and processing a touch screen generated signal for controlling the mobile device. Processing in a mobile device a motion detector generated signal into a motion detector generated control signal for control of mobile device. Receiving, demodulating and processing in a mobile device a modulated location finder signal into a processed location finder signal. Generating and processing in a mobile device a photo and/or video signal into processed digital photo and/or video signal. Providing the processed photo and/or digital video signal with said processed location finder signal to a transmitter for transmission of digital video signal with the processed location finder signal.

The present invention relates to communication technologies and provides a method and a device for FSK/GFSK demodulation, the method comprises: determining a digital information vector group {V.sub.l(i)} of a codeword a[k] to be demodulated and a corresponding phase matching vector group {.sub.i(i)] within the duration of (2M+1)T; determining a received phase vector {tilde over ()}(i) of a received FSK/GFSK baseband signal (t, a); determining an average phase difference .sub.l between {tilde over ()}(i) and .sub.l(i); calculating the phase matching degree Q.sub.l between {tilde over ()}(i) and .sub.l(i) after removing the impact of the average phase difference .sub.l, and determining an l value corresponding to the phase matching degree Q.sub.l being the maximum; and determining the a[k], corresponding to the l value, in the digital information vector V.sub.i(i) as a demodulation result. Because the impact of the average phase difference is removed during phase matching, the accuracy of phase matching is increased, and the performance of the phase domain demodulation technology is improved.

Receiving and processing in an automobile a sensor transmitted signal into a processed sensor signal for control or monitor of certain functions of an automobile. Processing in an automobile a touch screen generated signal for controlling communications and or navigation of the automobile. Receiving, demodulating and processing a signal into a processed baseband location finder signal for location finding and or navigation of an automobile. Providing a photo camera signal with processed baseband location finder signal to a modulator and transmitter for modulation and transmission of photo camera generated photo with processed baseband location finder signal in a third generation (3G), or a fourth generation (4G), or a fifth generation (5G) wireless network. Receiving and demodulating, in an automobile, a modulated Orthogonal Frequency Division Multiplexed (OFDM) signal into a first demodulated OFDM signal and processing, modulating and transmitting the first demodulated OFDM signal into a second processed, modulated and transmitted OFDM signal.

A system and method for encoding multi-bit features into sinusoidal waveforms at selected phase angles. The method includes receiving input digital data and encoding the input digital data in a sinusoidal waveform by modulating the sinusoidal waveform at selected phase angles within a period of the sinusoidal waveform, thereby creating a modulated sinusoidal waveform. An encoded analog waveform is generated, using a digital-to-analog converter, from a digital representation of the modulated sinusoidal waveform. The modulating includes forming a first data notch at a first phase angle of the selected phase angles wherein the first data notch includes a first plurality of transition features and subtends a first phase angle range about the first phase angle, the first plurality of transition features being representative of a first plurality of bit values included within the input digital data.