Transmitter and receiver system and method utilizing a pilot car

Details Transmitter and receiver system and method utilizing a pilot car Transmitter and receiver system and method utilizing a pilot car

1995-06-20

1998-03-17

Chin, Wellington

Pulse or digital communications

Systems using alternating or pulsating current

Amplitude modulation

375300, 332161, 329349, 455108, H03C 500, H04L 2702, H03D 500

Patent

active

057295751

ABSTRACT:
A digital transmission system for a selective call message communication network such as a paging network utilizes a quadrature amplitude modulation (QAM) transmitter (40) and receiver (42). The QAM transmitter (40) receives as a modulating input thereto, a message data encoded signal with a pilot carrier in a notch of the power spectrum of the signal. In order to generate the signal, the system generates a Hilbert transform of a wave-form representing message data to be transmitted. The Hilbert transform and message data waveform are combined to provide a positive frequency component and a negative frequency component. These frequency components are shifted apart and combined to provide a notch in which a DC component can be added to form a pilot carrier. A receiver of the system removes the pilot carrier from a received signal and shifts the positive and negative frequency components together to recover the message data.

REFERENCES:
patent: 4516087 (1985-05-01), Bruene
patent: 5113414 (1992-05-01), Karam et al.
patent: 5319676 (1994-06-01), Van Dasler et al.
TIA/EIA Interim Standard 95: Mobile Station-Base Station Compatibility Standard for Dual Mode Wideband Spread Spectrum Cellular Standard, Jul. 1993.
Oppenheim and Schafer, Digital Signal Proccessing, pp. 674-689, 1989.

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