Local wireless signal transmitting/receiving apparatus and method using digital radio frequency processing technology

• US 8,755,461 B2
• Filed: 05/19/2009
• Issued: 06/17/2014
• Est. Priority Date: 05/29/2008
• Status: Active Grant

• Current Assignee: SK Telecom Co., Ltd.
• Original Assignee: SK Telecom Co., Ltd.
• Inventors: Oh, Se Hyun, Shim, Woo Jin, Kim, Young Woo, YU, Jae Hwang, Hong, Sung Cheol
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US12/994,799
• Publication Number:
  US 20110075763A1
• Time in Patent Office: 1,855 Days
• Field of Search: 375/224, 375/247, 375/316, 375/320, 375/322, 375/344, 375/345, 455/130, 455/131, 455/192.1, 455/192.2, 455/205, 455/207, 455/214, 455/226.1, 455/234.1, 455/234.2, 455/245.2, 455/248.1, 455/253.2
• US Class Current: 375/316
• CPC Class Codes: H04L 27/2032 for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
• CPC Class Codes: H04L 27/223 Demodulation in the optical domain optical demodulation H04B10/676
• CPC Class Codes: H04L 27/361 Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

Abstract

A local wireless signal receiving apparatus using digital RF processing technology including: a receiving digital RF processor receiving an RF signal and detecting an IF signal from the received RF signal; a zero-crossing signal detector detecting a zero-crossing signal from the detected IF signal, and converting the detected zero-crossing signal into a digital signal; and a receiving signal processor converting the digital signal into a local wireless signal.

Claims

1. A local wireless signal receiving apparatus using digital radio frequency (RF) processing technology, the apparatus comprising:

a receiving digital RF processor comprising a mixer and an intermediate frequency (IF) processor,

wherein the mixer includes a first IF filter configured to filter an RF signal, detect a first decimation factor from the filtered RF signal, and remove the first decimation factor to detect a front-end stage of an analog signal corresponding to the RF signal to provide an IF signal, and

the IF processor includes a second IF filter configured to filter the IF signal, detect a second decimation factor from the filtered IF signal, and remove the second decimation factor to detect a back-end stage of the analog signal to provide a domain of a single-bit IF signal;

a zero-crossing signal detector comprising a one-bit detector configured to detect a zero-crossing signal of the domain of the single-bit IF signal and convert the detected zero-crossing signal into a single bit zero-crossing signal; and

a receiving signal processor configured to convert the single bit zero-crossing signal into a local wireless signal.

2. The local wireless signal receiving apparatus of claim 1, wherein the zero-crossing signal detector is one of a selecting zero-crossing signal detector or an averaging zero-crossing signal detector.

3. The local wireless signal receiving apparatus of claim 1, wherein the mixer further includes a digital RF filter configured to filter the RF signal, detect a decimation factor from the filtered RF signal, and remove the decimation factor to provide a filtered RF signal to the first IF filter.

4. The local wireless signal receiving apparatus of claim 1, wherein the zero-crossing signal detector further comprises

a time difference measuring unit configured to measure a time difference between the domain of the single bit IF signal;

and

a data detector configured to detect the zero-crossing signal and convert the detected zero-crossing signal into the single bit zero-crossing signal.

5. The local wireless signal receiving apparatus of claim 4, wherein the receiving signal processor is configured to convert the single bit zero-crossing signal into the local wireless signal and output the local wireless signal to a physical protocol data unit (PPDU).

6. A local wireless signal receiving method using digital radio frequency (RF) processing technology, the method performed by a local wireless signal receiving apparatus comprising a receiving digital RF processor including a mixer and an intermediate frequency (IF) processor, and the method comprising:

filtering, by a first IF filter included in the mixer, an RF signal, detecting a first decimation factor from the filtered RF signal, and removing the first decimation factor to detect a front-end stage of an analog signal corresponding to the RF signal to provide an IF signal;

filtering, by a second IF filter included in the IF processor, the IF signal, detecting a second decimation factor from the filtered IF signal, and removing the second decimation factor to detect a back-end stage of the analog signal to provide a domain of a single-bit IF signal;

detecting, by a one-bit detector included in a zero-crossing signal detector, a zero-crossing signal of the domain of the single-bit IF signal and converting the detected zero-crossing signal into a single bit zero-crossing signal; and

converting, by a receiving signal processor, the single bit zero-crossing signal into a local wireless signal.