SIGNAL RECEIVER WITH DIGITAL FRONT END SUPPORTING MULTIPLE BAND AND SIGNAL RECEIVING METHOD USING THE SAME

• US 20120163517A1
• Filed: 10/28/2011
• Published: 06/28/2012
• Est. Priority Date: 12/23/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Eo, Ik Soo, Yu, Hyun Kyu, Kim, Sang-Kyun, Park, Mijeong
• Granted Patent: US 8,693,581 B2
• Time in Patent Office: Days
• US Class Current: 375/350
• CPC Class Codes: H04B 1/001 Channel filtering, i.e. selecting a frequency channel within the SDR system multiplexing of multicarrier modulation signals being represented by different frequencies H04L5/06; multiplexing of multicarrier modulation signals H04L5/023
• CPC Class Codes: H04B 1/0021 Decimation, i.e. data rate reduction techniques H04B1/0025 takes precedence

Abstract

Disclosed is a method for receiving an analog signal from a receiver supporting at least a first channel band and a second channel band. The method for receiving an analog signal includes sampling the analog signal received through an antenna, generating a decimated signal by passing the sampled signal to a CIC decimation filter; and inputting the decimated signal to a channel selection filter.

Claims

1. A method for receiving a signal with a signal receiver with a digital front end supporting multiple bands, comprising:

sampling analog signals received through an antenna of the receiver supporting at least a first channel band and a second channel band;

generating decimated signals by passing the sampled signal to a CIC decimation filter;

inputting the decimated signal to a channel selection filter.

2. The method of claim 1, wherein a first ratio of the first channel band to a first sampling rate included in a signal output by passing a first signal having the first channel band among the analog signals to the CIC decimation filter is equal to a second ratio of the second channel band to a second sampling rate included in a signal output by passing a second signal having the second channel band among the analog signals to the CIC decimation filter.

3. The method of claim 2, wherein the sampling rate at the step of sampling is constant regardless of the channel bands of the analog signals.

4. The method of claim 1, wherein the step of inputting to the channel selection filter includes resampling the decimated signal.

5. The method of claim 4, wherein the step of resampling makes the sampling rate outputted constant regardless of the first channel band and the second channel band.

6. A signal receiver with a digital front end supporting multiple bands, comprising:

an analog-to-digital converter (ADC) configured to sample an analog signal received from an antenna with a digital signal;

a CIC decimation filter configured to decimate an output signal from the ADC; and

a channel selection filter configured to receive a signal output from the CIC decimation filter,

wherein the CIC decimation filter has a configuration in which a plurality of the same CIC filters are connected in series and supports at least a first channel band and a second channel band.

7. The signal receiver of claim 6, wherein a first ratio of the first channel band to a first sampling rate included in a signal output by passing a first signal having the first channel band among the analog signals to the CIC decimation filter is equal to a second ratio of the second channel band to a second sampling rate included in a signal output by passing a second signal having the second channel band among the analog signals to the CIC decimation filter.

8. The signal receiver of claim 7, wherein the sampling rate of the ADC is constant regardless of the channel bands of the analog signals.

9. The signal receiver of claim 6, wherein a resampler making the sampling rate outputted constant regardless of the first channel band and the second channel band is further provided between the CIC decimation filter and the channel selection filter.

10. The receiver of claim 9, wherein a CIC compensation filter is further provided between the CIC decimation filter and the resampler, and a frequency response of the CIC compensation filter at the first channel band and the second channel band has an inverse relationship with a frequency response of the CIC decimation filter at the first channel band and the second channel band.