CLOSED-LOOP RECEIVER FEEDBACK PRE-DISTORTION
First Claim
1. A two-terminal closed-loop communication system where pre-distortion coefficients are calculated for a first terminal at a second remote terminal, comprising:
- a first terminal, wherein said first terminal comprises;
a pre-distortion multiplication module, a transmitter, and a receiver; and
a second terminal, wherein said second terminal comprises;
a receiver, a pre-distortion coefficient calculator, and a transmitter, wherein;
said first terminal is located in a geographically distinct location from said second terminal;
said first terminal prepares and transmits a signal to said second terminal;
said signal is distorted by said first terminal prior to transmission to said second terminal;
said transmitted signal is received at the receiver of said second terminal;
said pre-distortion calculator determines the pre-distortion coefficients for said first terminal from the signal received from said first terminal;
said second terminal transmits said pre-distortion coefficients to said receiver at said first terminal;
said receiver at said first terminal receives said pre-distortion coefficients; and
said first terminal applies said pre-distortion coefficients to subsequently received signals.
5 Assignments
0 Petitions
Accused Products
Abstract
Methods and systems for calculating pre-distortion coefficients in a closed-loop communication system are presented. Transmission terminals that include high power amplifiers are difficult to operate at or near the saturation point without transmitting signals with nonlinear distortions. By pre-distorting the signal prior to amplification the transmitted nonlinear distortions may be decreased. A closed-looped pre-distortion system may include a receiver that calculates the pre-distortion coefficients and transmits these coefficients back to the transmitter. These coefficients may be stored in a pre-distortion coefficient lookup table and may be updated by the receiver terminal.
-
Citations
31 Claims
-
1. A two-terminal closed-loop communication system where pre-distortion coefficients are calculated for a first terminal at a second remote terminal, comprising:
-
a first terminal, wherein said first terminal comprises;
a pre-distortion multiplication module, a transmitter, and a receiver; and
a second terminal, wherein said second terminal comprises;
a receiver, a pre-distortion coefficient calculator, and a transmitter, wherein;
said first terminal is located in a geographically distinct location from said second terminal;
said first terminal prepares and transmits a signal to said second terminal;
said signal is distorted by said first terminal prior to transmission to said second terminal;
said transmitted signal is received at the receiver of said second terminal;
said pre-distortion calculator determines the pre-distortion coefficients for said first terminal from the signal received from said first terminal;
said second terminal transmits said pre-distortion coefficients to said receiver at said first terminal;
said receiver at said first terminal receives said pre-distortion coefficients; and
said first terminal applies said pre-distortion coefficients to subsequently received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A two-terminal closed-loop communications system, said two-terminal closed-loop communications system comprising:
-
a first terminal; and
a second terminal;
wherein;
said first terminal comprises a receiver, wherein said receiver receives pre-distortion coefficients from said second terminal;
said first terminal comprises a lookup table, wherein said lookup table stores pre-distortion coefficients received at said receiver;
said first terminal comprises a pre-distortion multiplication module, wherein said pre-distortion multiplication module modifies a data signal by applying said pre-distortion coefficients;
said first terminal comprises an amplifier, wherein said amplifier amplifies a signal after modification at said pre-distortion multiplication module;
said first terminal comprises a transmitter antenna, wherein said transmitter antenna transmits said signal;
said second terminal comprises a receiver, wherein said receiver receives a signal from said first terminal;
said second terminal comprises a pre-distortion coefficient calculator, wherein said pre-distortion coefficient calculator, determines pre-distortion coefficients based on said received signal; and
said second terminal comprises a transmitter, wherein said transmitter transmits said pre-distortion coefficients to said receiver located t said first terminal. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A terminal for a closed-loop pre-distortion feedback system, wherein said terminal comprises:
-
a receiver module;
a pre-distortion coefficient calculation module; and
a transmitter module, wherein;
said receiver module is adapted to receive transmitted signals from at least one source terminal;
said pre-distortion coefficient calculation module determines pre-distortion coefficients for said source terminal based on the signal received at said receiver; and
said transmitter module transmits said pre-distortion coefficients to said source terminal. - View Dependent Claims (17, 18)
-
-
19. A terminal for a closed-loop pre-distortion feedback system, wherein said terminal comprises:
-
a receiver module;
a pre-distortion multiplication module;
a pre-distortion coefficient look-up table;
an amplifier; and
a transmitter module;
wherein;
said receiver module receives pre-distortion coefficients transmitted from another terminal;
said pre-distortion coefficients received at said receiver module are stored in said pre-distortion coefficient lookup table;
said pre-distortion multiplication module modifies a signal by applying said pre-distortion coefficients stored in said lookup table to said signal said amplifier amplifies said signal after said pre-distortion coefficients have been applied to said signal at said pre-distortion coefficient multiplication module; and
said signal is transmitter from said transmitter by said transmitter module. - View Dependent Claims (20, 21, 22, 23)
-
-
24. A closed-loop satellite communication system, wherein said closed-loop satellite communication system comprises:
-
a plurality of satellite terminals; and
a gateway terminal;
wherein;
each satellite terminal comprises a pre-distortion multiplication module;
each satellite terminal comprises a high power amplifier;
each satellite terminal comprises a transmitter module;
each satellite terminal comprises a receiver module;
said gateway terminal comprises a pre-distortion coefficient calculation module;
said gateway terminal comprises a transmitter;
said plurality of satellite terminals transmit a signal that is received by said receiver at said gateway terminal;
said pre-distortion calculation module determines pre-distortion coefficients for the unique satellite terminal from which the signal was received;
said second terminal transmits said pre-distortion coefficients to said receiver at said satellite terminal; and
said receiver at said satellite terminal receives said pre-distortion coefficients.
-
-
25. A method for calculating closed-loop pre-distortion coefficients at a location for a remote terminal, wherein said method comprises the steps of
receiving a signal from a remote terminal at said location, wherein said location is remote to the remote terminal; -
calculating pre-distortion coefficients for application at the remote terminal from the signal received from said remote terminal at said location; and
transmitting said pre-distortion coefficients calculated in said calculating step back to said remote terminal. - View Dependent Claims (26, 27, 28, 29, 30, 31)
-
Specification