RECEIVER APPARATUS AND METHOD FOR TRACKING AND REJECTING TRANSMIT SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20090143037A1
• Filed: 12/02/2008
• Published: 06/04/2009
• Est. Priority Date: 12/03/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Jong-Won, Kim, Hoon-Tae, Lee, Hee-Hyun
• Granted Patent: US 8,027,655 B2
• Time in Patent Office: Days
• US Class Current: 455/260
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

A receiver apparatus for tracking and rejecting a Transmit (Tx) signal in a wireless communication system and an operation method thereof are provided. The receiver apparatus includes a controller for receiving channel frequency information of the Tx signal and for controlling an operation for tracking and rejecting a frequency of the Tx signal; a phase locked loop for generating an oscillation frequency by generating a control voltage according to the channel frequency information of the Tx signal under the control of the controller and for filtering a signal corresponding to the oscillation frequency among signals input to a low noise amplifier; and the low noise amplifier for amplifying power while minimizing noise of a signal filtered by the phase locked loop.

Claims

1. A receiver apparatus for tracking and rejecting a Transmit (Tx) signal in a wireless communication system, the apparatus comprising:

a controller adapted to receive channel frequency information of the Tx signal and to control an operation for tracking and rejecting a frequency of the Tx signal;

a phase locked loop adapted to generate an oscillation frequency by generating a control voltage according to the channel frequency information of the Tx signal under the control of the controller and to filter a signal corresponding to the oscillation frequency among signals input to a low noise amplifier; and

the low noise amplifier adapted to amplify power while minimizing noise of the signal filtered by the phase locked loop.

2. The apparatus of claim 1, wherein the phase locked loop comprises:

a divider adapted to receive the channel frequency information of the Tx signal, for dividing the channel frequency in a predetermined ratios;

a phase frequency detector adapted to generate a clock pulse which indicates a difference between the frequency provided from the divider and a reference frequency;

a charge pump adapted to generate a current according to the generated clock pulse;

a loop filter adapted to generate a control voltage according to the generated current; and

a Tx signal tracker/rejector adapted to generate an oscillation frequency using the control voltage under the control of the controller or to filter a signal corresponding to the oscillation frequency.

3. The apparatus of claim 2, wherein the Tx signal tracker/rejector operates as a voltage controlled oscillator adapted to oscillate the oscillation frequency depending on the control voltage according to an amount of bias current provided under the control of the controller or operate as an active filter for filtering a signal of a frequency band corresponding to the oscillation frequency.

4. The apparatus of claim 3, wherein, under the control of the controller, the Tx signal tracker/rejector operates as the voltage controlled oscillator when the amount of bias current is above a reference point, and operates as the active filter when the amount of bias current is below the reference point.

5. The apparatus of claim 1, wherein, if the oscillation frequency of the phase locked loop is equal to the channel frequency of the Tx signal, the controller disables operations of all elements included in the phase locked loop and maintains the generated control voltage.

6. The apparatus of claim 1, wherein, when the oscillation frequency of the phase locked loop is different from the channel frequency of the Tx signal, the controller controls the phase locked loop to generate the oscillation frequency by generating the control voltage, and when the two frequencies are equal to each other, controls the phase locked loop to filter a signal corresponding to the oscillation frequency.

7. A method of operating a receiver for tracking and rejecting a Transmit (Tx) signal in a wireless communication system, the method comprising the steps of:

generating a control voltage using a phase locked loop according to channel frequency information of the Tx signal and a reference frequency;

oscillating an oscillation frequency according to the control voltage using a Tx signal tracker/rejector;

determining whether the oscillation frequency is equal to the channel frequency of the Tx signal by comparing the two frequencies; and

if the two frequencies are equal to each other, filtering a signal corresponding to the oscillation frequency among signals input to the Tx signal tracker/rejector.

8. The method of claim 7, wherein the generating a control voltage comprises:

dividing the channel frequency of the Tx signal in a predetermined ratio and outputting the divided channel frequency;

generating a clock pulse indicating a difference between the output frequency and a reference frequency;

generating a current according to the generated clock pulse; and

generating a control voltage according to the generated current.

9. The method of claim 7, further comprising, if the two frequencies are equal to each other, disabling operations of all elements included in the phase locked loop and maintaining the generated control voltage.

10. The method of claim 7, further comprising, if the two frequencies are equal to each other, filtering a signal corresponding to the oscillation frequency by providing an amount of bias current above a reference point to the Tx signal tracker/rejector.

11. The method of claim 7, further comprising, if the two frequencies are not equal to each other, oscillating the oscillation frequency according to the control voltage by continuously providing an amount of bias current below the reference point to the Tx signal tracker/rejector.

12. An apparatus for tracking and rejecting a Transmit (Tx) signal in a wireless communication system, the apparatus comprising:

a receiver adapted to receive channel frequency information of the Tx signal; and

a phase locked loop adapted to generate an oscillation frequency corresponding to the channel frequency information of the Tx signal and to filter a signal corresponding to the oscillation frequency among signals input to a low noise amplifier.

13. A method of operating a receiver for tracking and rejecting a Transmit (Tx) signal in a wireless communication system, the method comprising:

receiving channel frequency information of the Tx signal;

generating an oscillation frequency corresponding to the channel frequency information of the Tx signal; and

filtering a signal corresponding to the oscillation frequency among signals input to a low noise amplifier.