US 7,688,911 B2 · Method and apparatus for synchronizing alternating quadratures differential binary phase shift keying modulation and demodulation arrangements

Abstract

Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of transmitter power, high noise immunity of modulation and demodulation, fast synchronization, and simple implementation. Efficient utilization of transmitter power is achieved because radical reduction of side lobe regeneration provided by AQDBPSK allows operation of all amplifiers of the transmitter analog signal path, including power amplifiers, in energy efficient nonlinear mode (for example, they can operate as class C amplifiers) without causing interchannel interference. AQDBPSK radically reduces side lobe regeneration by limiting phase transitions between adjacent in time modulator output symbols to .+−.90.degree and smoothly executing the transitions.

Claims18

Dependent claims

A method of operating a modulator by performing alternating quadratures differential binary phase shift keying modulation, comprising the steps of:

limiting phase changes between adjacent in time output symbols produced by the modulator to ±90°;
transmitting data input to the modulator by 0° and 180° phase differences between non-adjacent in time output symbols produced by the modulator;
and
producing a synchronization sequence and adding the synchronization sequence to data transmitted by the modulator.

1 more element

An apparatus for performing alternating quadratures differential binary phase shift keying modulation, comprising:

a modulator that limits phase changes between adjacent in time modulator output symbols to ±90°, transmits modulator input data by 0° and 180° phase differences between non-adjacent in time modulator output symbols, and produces a synchronization sequence and adds the synchronization sequence to the transmitted data.

Dependencies are inferred from the claim text.

Method and apparatus for synchronizing alternating quadratures differential binary phase shift keying modulation and demodulation arrangements

Life of this patent

Method and apparatus for synchronizing alternating quadratures differential binary phase shift keying modulation and demodulation arrangements

Life of this patent

Abstract

Claims18