TRANSMISSION-RECEPTION DEVICE

• US 20130157589A1
• Filed: 01/31/2012
• Published: 06/20/2013
• Est. Priority Date: 03/30/2011
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Shirakata, Naganori, Morita, Tadashi
• Granted Patent: US 9,065,538 B2
• Time in Patent Office: Days
• US Class Current: 455/75
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04L 25/068 by sampling faster than the nominal bit rate
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
• CPC Class Codes: H04L 27/367 using predistortion

Abstract

A transmission-reception device includes a radio frequency section that performs a frequency conversion on a signal which is modulated using a single carrier transmission system, a correction coefficient multiplier that multiplies a frequency domain signal by a distortion correction coefficient in the frequency conversion of the radio frequency section to correct a distortion, a first transformer that converts a time domain signal into a frequency domain signal at a time of reception, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of transmission, and a second transformer that converts a time domain signal into a frequency domain signal at a time of transmission, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of reception.

Claims

1. A transmission-reception device, comprising:

a radio frequency section that performs a frequency conversion on a signal which is modulated using a single carrier transmission system;

a correction coefficient multiplier that multiplies a frequency domain signal by a distortion correction coefficient in the frequency conversion of the radio frequency section to correct a distortion;

a first transformer that converts a time domain signal into a frequency domain signal at a time of reception, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of transmission; and

a second transformer that converts a time domain signal into a frequency domain signal at a time of transmission, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of reception.

2. The transmission-reception device according to claim 1, wherein

the first transformer converts a loopback signal from a transmission side to a reception side of the radio frequency section, into a frequency domain signal, at a time of calibration.

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

a distortion estimator that estimates distortion characteristics in the frequency conversion of the radio frequency section, based on the frequency domain signal into which the loopback signal is converted; and

a correction coefficient calculator that calculates a correction coefficient which is inverse characteristics of the distortion characteristics estimated by the distortion estimator, wherein

the correction coefficient multiplier multiplies the frequency domain signal by the correction coefficient calculated by the correction coefficient calculator, to correct the distortion at the time of transmission.

4. The transmission-reception device according to claim 1, wherein

the second transformer performs an oversampling where a signal having P×

N points, where P>

1, is obtained from a signal having N points, with respect to the frequency domain signal which is converted at the time of transmission, and

the correction coefficient multiplier multiplies the signal having P×

N points by a correction coefficient, to correct the distortion.

5. The transmission-reception device according to claim 4, wherein

the correction coefficient calculator calculates the correction coefficient by multiplying a coefficient for limiting a band.