Phase correlated quadrature amplitude modulation
View Patent ↗A method for transmitting a base band digital data signal having a bit period and a first bandwidth, comprising providing a carrier wave having a carrier amplitude and a carrier frequency, and synchronously modulating both the carrier amplitude and carrier frequency with the base band digital signal, so as to reduce the bandwidth of the modulated carrier wave below the bandwidth of the base band signal. A method for transmitting a base band digital data signal having a bit period and a first bandwidth, comprising providing a carrier wave having a carrier phase and a carrier frequency, and synchronously modulating both the carrier phase and carrier frequency with the base band digital signal, so as to reduce the bandwidth of the modulated carrier wave below the bandwidth of the base band signal.
1. A method of transmitting base band binary data contained in respective successive time cells using a digital communication system, the base band binary data being transmitted in the form of a signal obtained by amplitude modulation and frequency modulation of a wireless carrier wave
with a 0 bit data having a 0 bit mean amplitude and a 0 bit mean frequency and a 0 bit duration and a 1 bit data having a 1 bit mean amplitude and a 1 bit mean frequency and a 1 bit duration
the improvement wherein the amplitude and frequency are modulated with the same binary base band signal whereby to decrease a spectral width of the resulting modulated signal below the spectral width of the binary base band signal;
wherein a product of the 0 bit duration and a frequency excursion between the 1 bit mean frequency and the 0 bit mean frequency is equal to ½ such that the frequency excursion produces a π phase shift between 1 bits having an odd number of 0 bits therebetween.
2. A method for transmitting a base band digital data signal having a bit period and a first bandwidth using a digital communication system, comprising:
providing a carrier wave having a carrier amplitude and a carrier frequency with 0 bit data having a 0 bit mean amplitude and a 0 bit mean frequency and a 0 bit duration and 1 bit data having a 1 bit mean amplitude and a 1 bit mean frequency and a 1 bit duration; and
synchronously modulating both the carrier amplitude and carrier frequency with the base band digital data signal, so as to reduce a bandwidth of the modulated carrier wave below the first bandwidth of the base band digital data signal;
wherein a product of the 0 bit duration and a frequency excursion between the 1 bit mean frequency and the 0 bit mean frequency is equal to about ½ such that the frequency excursion produces a π phase shift between 1 bits having an odd number of 0 bits therebetween.
3. A method as in claim 2 , wherein an amplitude excursion of the modulated carrier wave is higher than 10 decibels.
4. A method for transmitting a base band digital data signal having a bit period and a first bandwidth using a digital communication system, comprising:
providing a wireless carrier wave having a carrier phase and a carrier frequency with 0 bit data having a 0 bit mean amplitude and a 0 bit mean frequency and a 0 bit duration and 1 bit data having a 1 bit mean amplitude and a 1 bit mean frequency and a 1 bit duration; and
synchronously modulating both the carrier phase and carrier frequency with the base band digital data signal, so as to reduce a bandwidth of the modulated carrier wave below the first bandwidth of the base band digital data signal;
wherein a product of the 0 bit duration and a frequency excursion between the 1 bit mean frequency and the 0 bit mean frequency is equal to about ½ such that the frequency excursion produces a π phase shift between 1 bits having an odd number of 0 bits therebetween.