QAM and GMSK systems

Details QAM and GMSK systems QAM and GMSK systems

2007-11-08

2011-11-01

Wang, Ted M (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S260000, C375S267000, C375S295000, C375S297000, C375S299000

Reexamination Certificate

active

08050345

ABSTRACT:
Transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian filtered modulated signal and a second transmit filter and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal. A first amplifier and first transmitter for nonlinearly amplifying and a second amplifier and second transmitter for linearly amplifying modulated signals. A diversity receiver and demodulator system for receiving and demodulating transmitted modulated signals. Processor, transmit baseband filter and modulator provides cross-correlated in-phase and quadrature-phase Gaussian filtered Gaussian Minimum Shift Keying (GMSK) modulated signal, spread spectrum Quadrature Phase Shift Keying (QPSK) modulated signal. Transmit processor and filter provides time division multiplexed (TDM) Gaussian filtered baseband signal and Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal to a cellular network and to separate wireless network. Diversity receiver and demodulator provides demodulated cross-correlated in-phase and quadrature-phase filtered signal, with receive filter mis-matched to transmit filter.

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