Digital baseband receiver including a time domain compensation module for suppressing group delay variation distortion incurred due to analog low pass filter deficiencies
AssigneeInterDigital Technology Corporation
InventorsAlpaslan Demir, Leonid Kazakevich, Tanbir Haque
Life of this patent
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Abstract
A digital baseband (DBB) radio frequency (RF) receiver used for receiving and processing a wireless communication signal. The DBB receiver includes a demodulator, first and second analog low pass filters (LPFs), first and second digital gain control circuits, and a digital time domain compensation module which removes group delay variation distortion, introduced by the first and second analog LPFs, from real and imaginary signal components of the communication signal.
Claims24
A digital baseband (DBB) receiver for receiving and processing a wireless communication signal, the DBB receiver comprising:
- a) a demodulator which outputs analog real and imaginary signal components in response to receiving the communication signal;
- b) a first analog low pass filter (LPF) which receives the analog real signal component from the demodulator and outputs a distorted analog real signal component;
- c) a second analog LPF which receives the analog imaginary signal component from the demodulator and outputs a distorted analog imaginary signal component;
- d) a first digital gain control circuit which receives the distorted analog real signal component from the first analog LPF and outputs a processed distorted digital real signal component;
- e) a second digital gain control circuit which receives the distorted analog imaginary signal component from the second analog LPF and outputs a processed distorted digital imaginary signal component;
- and
- f) a digital time domain compensation module which receives the processed distorted digital real and imaginary signal components and outputs digital real and imaginary compensated signal components, wherein the digital time domain compensation module removes group delay variation distortion, introduced by the first and second analog LPFs, from the real and imaginary signal components.
A wireless transmit/receive unit (WTRU) for receiving and processing a wireless communication signal, the WTRU comprising:
- a) a demodulator which outputs analog real and imaginary signal components in response to receiving the communication signal;
- b) a first analog low pass filter (LPF) which receives the analog real signal component from the demodulator and outputs a distorted analog real signal component;
- c) a second analog LPF which receives the analog imaginary signal component from the demodulator and outputs a distorted analog imaginary signal component;
- d) a first digital gain control circuit which receives the distorted analog real signal component from the first analog LPF and outputs a processed distorted digital real signal component;
- e) a second digital gain control circuit which receives the distorted analog imaginary signal component from the second analog LPF and outputs a processed distorted digital imaginary signal component;
- and
- f) a digital time domain compensation module which receives the processed distorted digital real and imaginary signal components and outputs digital real and imaginary compensated signal components, wherein the digital time domain compensation module removes group delay variation distortion, introduced by the first and second analog LPFs, from the real and imaginary signal components.
An integrated circuit (IC) for receiving and processing a wireless communication signal, the IC comprising:
- a) a demodulator which outputs analog real and imaginary signal components in response to receiving the communication signal;
- b) a first analog low pass filter (LPF) which receives the analog real signal component from the demodulator and outputs a distorted analog real signal component;
- c) a second analog LPF which receives the analog imaginary signal component from the demodulator and outputs a distorted analog imaginary signal component;
- d) a first digital gain control circuit which receives the distorted analog real signal component from the first analog LPF and outputs a processed distorted digital real signal component;
- e) a second digital gain control circuit which receives the distorted analog imaginary signal component from the second analog LPF and outputs a processed distorted digital imaginary signal component;
- and
- f) a digital time domain compensation module which receives the processed distorted digital real and imaginary signal components and outputs digital real and imaginary compensated signal components, wherein the digital time domain compensation module removes group delay variation distortion, introduced by the first and second analog LPFs, from the real and imaginary signal components.
Dependencies are inferred from the claim text.