Signal receiver with digital front end supporting multiple band and signal receiving method using the same

• US 8,693,581 B2
• Filed: 10/28/2011
• Issued: 04/08/2014
• Est. Priority Date: 12/23/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Sang-Kyun, Eo, Ik Soo, Park, Mijeong, Yu, Hyun Kyu
• Primary Examiner(s): Corrielus, Jean B
• Application Number:
  US13/284,751
• Publication Number:
  US 20120163517A1
• Time in Patent Office: 893 Days
• Field of Search: 375259-260, 375/285, 375/316, 375/346, 375/350
• US Class Current: 375/316
• 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 through a receiver that includes a digital front end supporting multiple channel bands, the method 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 signals to a cascaded integrator comb (CIC) decimation filter; and

inputting the decimated signals to a channel selection filter,

wherein a first ratio of a bandwidth of the first channel band to a first sampling rate included in a first decimated 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 a bandwidth of the second channel band to a second sampling rate included in a second decimated signal output by passing a second signal having the second channel band among the analog signals to the CIC decimation filter.

2. The method of claim 1, wherein a sampling rate at the sampling is constant regardless of channel bands of the analog signals.

3. The method of claim 1, wherein the inputting includes resampling the decimated signals.

4. The method of claim 3, wherein a sampling rate at the resampling is constant regardless of the first channel band and the second channel band.

5. A receiver including a digital front end supporting multiple bands, the receiver comprising:

an analog-to-digital converter (ADC) configured to sample analog signals received through an antenna and generate digital signals;

a CIC decimation filter configured to decimate the digital signals from the ADC; and

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

wherein the CIC decimation filter includes a plurality of CIC filters connected in series and supports at least a first channel band and a second channel band, and

wherein a first ratio of a bandwidth of the first channel band to a first sampling rate included in a first decimated 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 a bandwidth of the second channel band to a second sampling rate included in a second decimated signal output by passing a second signal having the second channel band among the analog signals to the CIC decimation filter.

6. The receiver of claim 5, wherein a sampling rate of the ADC is constant regardless of the channel bands of the analog signals.

7. The receiver of claim 5, further comprising a resampler configured to resample the decimated signals and disposed between the CIC decimation filter and the channel selection filter, wherein a sampling rate of the resampler is constant regardless of the first channel band and the second channel band.

8. The receiver of claim 7, further comprising a CIC compensation filter disposed between the CIC decimation filter and the resampler, wherein 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.

9. The receiver of claim 8, further comprising:

a direct current (DC) offset compensation filter configured to estimate and remove a DC offset present in an output signal of the CIC compensation filter; and

an IQ mismatch compensation filter configured to estimate and compensate an I/Q mismatch degree of an output signal of the DC offset compensation filter,

wherein the DC offset compensation unit and the I/Q mismatch compensation filter are disposed between the CIC compensation filter and the resampler.