Method for determining desired components of quadrature modulated signals
AssigneeMotorola, Inc.
InventorsSteven C. Jasper, Mark A. Birchler
Life of this patent
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Abstract
In the following manner, a receiver that receives quadrature modulated signals may determine desired components of the quadrature modulated signals by minimizing effects of transmitted distortion produced by gain, phase, or gain-phase imbalance. A quadrature modulated signal that includes a desired component, a fading component, and a transmitter distortion component is received by the receiver, wherein the transmitter distortion component includes a conjugate component and an imbalance component. The receiver estimates the fading component, the conjugate component, and the imbalance component and determines the desired component based on these estimates and the quadrature modulated signal.
Claims12
In a receiver that receives quadrature modulated signals, a method for determining desired components of the quadrature modulated signals by minimizing effects of transmitted distortion produced by gain, phase, or gain-phase imbalance in a transmitter that transmitted the quadrature modulated signals, the method comprises the steps of:
- a) receiving a quadrature modulated signal, wherein the quadrature modulated signal includes a desired component, a fading component, and a transmitter distortion component and wherein the transmitter distortion component includes a conjugate component and an imbalance component;
- b) estimating, by the receiver, the fading component to produce an estimated fading component;
- c) estimating, by the receiver, the conjugate component to produce an estimated conjugate component;
- d) estimating, by the receiver, the imbalance component to produce an estimated imbalance component;
- e) determining, by the receiver, the desired component based on the quadrature modulated signal, the estimated fading component, the estimated conjugate component, and the estimated imbalance component.
In a receiver that receives quadrature modulated signals, wherein the quadrature modulated signals include at least two subchannel signals, a method for determining desired components of the quadrature modulated signals by minimizing effects of transmitted distortion produced by gain, phase, or gain-phase imbalance in a transmitter that transmitted the quadrature modulated signals, the method comprises the steps of:
- a) receiving a quadrature modulated signal, wherein each subchannel signal of the at least two subchannel signals includes a desired component, a fading component, and a transmitter distortion component and wherein the transmitter distortion component includes a conjugate component and an imbalance component;
- b) estimating, by the receiver, the fading component of the each subchannel signal to produce estimated fading components;
- c) estimating, by the receiver, the conjugate component of the each subchannel signal based on the desired component of a corresponding mirror image subchannel signal of the at least two subchannel signals to produce estimated conjugate components;
- d) estimating, by the receiver, the imbalance component to produce an estimated imbalance component;
- e) determining, by the receiver, the desired component of the each subchannel signal based on the quadrature modulated signal, the estimated fading components, the estimated conjugate components, and the estimated imbalance component.
Dependencies are inferred from the claim text.