UWB transmitting and receiving device for removing an unnecessary carrier component in a transmission signal spectrum

• US 7,340,234 B2
• Filed: 12/23/2004
• Issued: 03/04/2008
• Est. Priority Date: 12/23/2003
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jun, Si-Bum, Lee, Sun-Gi, Kim, Kook-Jun, Cho, Tae-Hui
• Primary Examiner(s): Le; Lana
• Assistant Examiner(s): AKBAR, MUHAMMAD A
• Application Number:
  US11/020,354
• Publication Number:
  US 20050136868A1
• Time in Patent Office: 1,167 Days
• Field of Search: 455/127.1, 455/232.1, 455/78, 455/126, 455/67.11, 455/67.13, 455/67.14, 455/63.1, 455/226.1, 455/296, 375/319
• US Class Current: 455/232.1
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 7/282 Transmitters
• CPC Class Codes: G01S 7/4008 of transmitters
• CPC Class Codes: G01S 7/4052 by simulation of echoes
• CPC Class Codes: G01S 7/4069 involving a RF signal injection
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• 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 5/1469 using time-sharing

Abstract

An Ultra Wide Band (UWB) transmitting and receiving device that includes a Digital Signal Processor (DSP) for implementing a DC offset cancellation algorithm, an adder for adding a baseband transmission signal from the transmitter and a calibration signal produced by the algorithm of the DSP, a modulator for modulating the signal from the adder, a transmitter amplifier for amplifying the modulated signal, a coupler for applying the output of the transmitter to the receiver, and a switch for selectively connecting the output of the coupler to the input of the receiver.

Claims

1. An Ultra Wide Band (UWB) transmitting and receiving device including a receiver and a transmitter, the device comprising:

a coupler connected to the transmitter for applying an output signal of the transmitter to the receiver;

a switch connected between the coupler and the receiver for selectively applying an output signal of the coupler to the receiver, and feeding back the output signal of the coupler to a Digital Signal Processing (DSP) device;

the Digital Signal Processing (DSP) device connected to the receiver for feeding back the output signal of the coupler through the receiver, generating a calibration signal using the feed-back output signal of the coupler according to a DC offset cancellation algorithm and applying the calibration signal to an adder included in the transmitter;

the adder connected to the DSP device for adding a baseband transmission signal from the transmitter and the calibration signal

a modulator for modulating a signal from the adder; and

a transmitter amplifier for amplifying the modulated signal.

2. The device according to claim 1, wherein the DSP device estimates a carrier feed-through component caused by the transmitter using a DC offset caused by the receiver and an original form of a signal sampled in the transmitter, and regards the estimated value as an error caused by incompleteness of the transmitter.

3. The device according to claim 2, further comprising:

a receiver amplifier for amplifying a transmission signal received from the coupler; and

a modulator for modulating the amplified signal from the receiver amplifier and outputting the modulated signal to the DSP device.