DIGITAL RF RECEIVER

• US 20140044221A1
• Filed: 08/06/2013
• Published: 02/13/2014
• Est. Priority Date: 08/08/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: EO, Ik Soo, Han, Seon Ho, Kim, Sang Kyun
• Granted Patent: US 9,270,502 B2
• Time in Patent Office: Days
• US Class Current: 375/319
• CPC Class Codes: H04B 1/0007 wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
• CPC Class Codes: H04L 25/061 providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset removal of dc offset in coupling arrangements H04L25/029, H04L25/0296
• CPC Class Codes: H04L 27/3863 Compensation for quadrature error in the received signal

Abstract

Embodiments provide a digital RF receiver including a signal converting unit which converts an RF signal received from an external device into a digital signal, a plurality of functional modules which processes the digital signal in accordance with a predetermined algorithm when the digital signal is input, and a signal processing controller which selects at least one of the plurality of functional modules to control the digital signal to be processed in consideration of whether an IF signal component is included in the digital signal or a sampling rate related with sampling information of the digital signal.

Claims

1. A digital RF receiver, comprising:

a signal converting unit which converts an RF signal received from an external device into a digital signal;

a plurality of functional modules which processes the digital signal in accordance with a predetermined algorithm when the digital signal is input; and

a signal processing controller which selects at least one of the plurality of functional modules to control the digital signal to be processed in consideration of whether an IF signal component is included in the digital signal or a sampling rate related with sampling information of the digital signal.

2. The digital RF receiver of claim 1, wherein:

the plurality of functional modules, includes

a DC offset compensating unit which removes a DC component included in the digital signal;

an IQ inconsistency compensating unit which compensates a phase error of an In-phase signal and a quadrature signal of the digital signal;

a mixer which removes the IF signal from the digital signal and separates a phase;

an integer decimation filter which performs integer decimation so as to satisfy an integer sampling rate required for sampling information of the digital signal;

a rational number decimation filter which performs rational decimation so as to satisfy a rational number sampling rate of the digital signal; and

a signal processing unit which includes a channel selecting filter which removes an interference signal from the digital signal.

3. The digital RF receiver of claim 2, wherein:

when the IF signal component is included in the digital signal and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the mixer, the integer decimation filter, and the channel selecting filter and outputs the digital signal to the mixer, the integer decimation filter, and the channel selecting filter in accordance with a predetermined order.

4. The digital RF receiver of claim 2, wherein:

when the IF signal component is included in the digital signal and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.

5. The digital RF receiver of claim 2, wherein:

when the IF signal component and the DC component are included in the digital signal and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the DC offset compensating unit, the mixer, the integer decimation filter, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the mixer, the integer decimation filter, and the channel selecting filter in accordance with a predetermined order.

6. The digital RF receiver of claim 2, wherein:

when the IF signal component and the DC component are included in the digital signal and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the DC offset compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.

7. The digital RF receiver of claim 2, wherein:

when the IF signal component is included in the digital signal and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the IQ inconsistency compensating unit, the mixer, the integer decimation filter, and the channel selecting filter and outputs the digital signal to the IQ inconsistency compensating unit, the mixer, the integer decimation filter, and the channel selecting filter in accordance with a predetermined order.

8. The digital RF receiver of claim 2, wherein:

when the IF signal component is included in the digital signal, the IQs are inconsistent, and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the IQ inconsistency compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the IQ inconsistency compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.

9. The digital RF receiver of claim 2, wherein:

when the IF signal component and the DC component are included in the digital signal, the IQs are inconsistent, and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the DC offset compensating unit, the IQ inconsistency compensating unit, the mixer, the integer decimation filter, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the IQ inconsistency compensating unit, the mixer, the integer decimation filter, and the channel selecting filter in accordance with a predetermined order.

10. The digital RF receiver of claim 2, wherein:

when the IF signal component and the DC component are included in the digital signal, the IQs are inconsistent, and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the DC offset compensating unit, the IQ inconsistency compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the IQ inconsistency compensating unit, the mixer, the integer decimation filter, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.

11. The digital RF receiver of claim 2, wherein:

when the IQs of the digital signal are inconsistent and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the integer decimation filter, the IQ inconsistency compensating unit, and the channel selecting filter and outputs the digital signal to the integer decimation filter, the IQ inconsistency compensating unit, and the channel selecting filter in accordance with a predetermined order.

12. The digital RF receiver of claim 2, wherein:

when the IQs of the digital signal are inconsistent and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the integer decimation filter, the IQ inconsistency compensating unit, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the integer decimation filter, the IQ inconsistency compensating unit, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.

13. The digital RF receiver of claim 2, wherein:

when the DC component is included in the digital signal, the IQs are inconsistent, and the sampling rate of the digital signal does not satisfy a predetermined integer sampling rate, the signal processing controller selects the DC offset compensating unit, the integer decimation filter, the IQ inconsistency compensating unit, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the integer decimation filter, the IQ inconsistency compensating unit, and the channel selecting filter in accordance with a predetermined order.

14. The digital RF receiver of claim 2, wherein:

when the DC component is included in the digital signal, the IQs are inconsistent, and the sampling rate of the digital signal does not satisfy a predetermined rational number sampling rate, the signal processing controller selects the DC offset compensating unit, the integer decimation filter, the IQ inconsistency compensating unit, the rational number decimation filter, and the channel selecting filter and outputs the digital signal to the DC offset compensating unit, the integer decimation filter, the IQ inconsistency compensating unit, the rational number decimation filter, and the channel selecting filter in accordance with a predetermined order.