Unbalanced quadrature waveform
AssigneeTRW Inc.
InventorHarvey L. Berger
Life of this patent
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Abstract
A method 1100 and apparatus 1200 utilizing unbalanced modulation for providing users in a communication system with different amounts of effective communication energy according to their individual communication environments. A user's communication energy needs are determined based on conditions such as weather, signal-to-noise ratio, and cell location. Signals destined for a user are modulated according to the determined needs of the user. A signal destined for a user operating in a relatively friendly communication environment is modulated with less effective energy than a signal destined for a user operating in a relatively hostile communication environment.
Claims20
A method for providing different effective communication energy levels to different users of a communication system the method comprising:
- determining communication energy requirements for the users;
- modulating a signal for communication with said users using unbalanced modulation, said signal modulated with a relatively high energy component of said unbalanced modulation when a first of said users requires relatively high communication energy, and said signal modulated with a relatively low energy component of said unbalanced modulation when a second of said users requires relatively low communication energy;
- and
- transmitting said signal to said users during a common time period at substantially the same data rate for said signal modulated with a relatively high energy component and said signal modulated with a relatively low energy component.
A method for providing different effective communication energy levels to different users of a communication system, the method comprising:
- classifying a first of the users as an advantaged user when said first user requires relatively low communication energy, and classifying a second of the users as a disadvantaged user when said second user requires relatively high communication energy;
- modulating a signal for communication with said users using unbalanced phase modulation, wherein said signal is phase modulated along a major axis of phase modulation when said user is a disadvantaged user, and wherein said signal is phase modulated along a minor axis of phase modulation when said user is an advantaged user;
- and
- transmitting said signal to said users during a common time period at substantially the same data rate for the advantaged user and the disadvantaged user.
A communication system for providing different effective communication energy levels to different users, said communication system comprising:
- a data source providing data to be sent to classified users;
- a modulation controller which determines a modulation strategy for said data based on said classified users;
- an unbalanced modulator including a modulated signal output, said modulated signal output outputting an output signal modulated with said data using said modulation strategy;
- and
- a transmitter which transmits said output signal to said users during a common time period at substantially the same data rate for different modulation strategies determined by said modulation controller.
Dependencies are inferred from the claim text.