Radio transmission apparatus and radio reception apparatus

• US 20010004605A1
• Filed: 12/20/2000
• Published: 06/21/2001
• Est. Priority Date: 12/21/1999
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miyano, Kantaro, Mimura, Masahiro, Koyanagi, Yoshio, Hasegawa, Makoto, Nakagawa, Youichi
• Granted Patent: US 7,062,245 B2
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

Corresponding to transmission data 101, phase controller 105 is controlled to shift a phase of modulated signal 103 by 0° or 180°. Planes of polarization of modulated signals to be transmitted from antennas 106 and 107 are made different from each other corresponding to transmission data 101. The electric field strength of a signal received at antenna 108 changes corresponding to the plane of polarization, thereby voltage value 113 output from electric field strength detector 111 varies corresponding to transmission data 101, and using this variation, judged result 115 is obtained. Two results, namely, demodulated data 112 and judged result 115 are input to comparing circuit 116, whereby the reception apparatus is capable of obtaining received data 117 with high quality.

Claims

1. A radio transmission apparatus comprising:

an antenna comprised of first and second linear polarization antenna elements perpendicular to each other;

modulating means for modulating transmission data to output a modulated signal; and

phase controlling means for providing a 180 degrees phase difference to the modulated signal corresponding to the transmission data to output.

2. The radio transmission apparatus according to

claim 1

, wherein the first and second linear polarization antenna elements are located with longitudinal directions thereof crossing.

3. The radio transmission apparatus according to

claim 1

, wherein the first and second linear polarization antenna elements are located at a spaced interval on a plane with a longitudinal relationship between the elements indicative of twisted positions.

4. The radio transmission apparatus according to

claim 1

, wherein the first and second linear polarization antenna elements are located at a spaced interval with a longitudinal relationship between the elements indicative of having an angle.

5. The radio transmission apparatus according to

claim 1

, wherein the phase controlling means is multiplying means for multiplying a transmission signal by a reference signal to multiply a reference signal that inverts a polarity of the transmission signal corresponding to the reference signal.

6. A radio transmission apparatus comprising:

an antenna comprised of first and second linear polarization antenna elements perpendicular to each other;

modulating means for modulating transmission data to output a modulated signal;

spreading means for spreading the modulated signal to output a spread signal; and

phase controlling means for providing a 180 degrees phase difference to the spread signal corresponding to a spreading code to output.

7. The radio transmission apparatus according to

claim 6

, wherein the first and second linear polarization antenna elements are located with longitudinal directions thereof crossing.

8. The radio transmission apparatus according to

claim 6

, wherein the first and second linear polarization antenna elements are located at a spaced interval on a plane with a longitudinal relationship between the elements indicative of twisted positions.

9. The radio transmission apparatus according to

claim 6

, wherein the first and second linear polarization antenna elements are located at a spaced interval with a longitudinal relationship between the elements indicative of having an angle.

10. The radio transmission apparatus according to

claim 6

, wherein the phase controlling means is multiplying means for multiplying a transmission signal by a reference signal to multiply a reference signal that inverts a polarity of the transmission signal corresponding to the reference signal.

11. A radio transmission apparatus comprising:

an antenna comprised of first antenna element and second antenna element that provide different planes of polarization;

modulating means for modulating transmission data to output a modulated signal; and

a switch that switches the first antenna element and the second antenna element to input the modulated signal thereto corresponding to the transmission data.

12. A radio transmission apparatus comprising:

an antenna comprised of first antenna element and second antenna element that provide different planes of polarization;

modulating means for modulating transmission data to output a modulated signal;

spreading means for spreading the modulated signal to output a spread signal; and

a switch that switches the first antenna element and the second antenna element to input the spread signal thereto corresponding to a spreading code.

13. A radio transmission apparatus comprising;

an antenna that enables two kinds of polarizations perpendicular to each other to be transmitted and further enables the polarizations to be switched corresponding to transmission data; and

modulating means for modulating the transmission data to output a modulated signal.

14. A radio transmission apparatus comprising:

an antenna that enables two kinds of polarizations perpendicular to each other to be transmitted and further enables the polarizations to be switched corresponding to a spreading code;

modulating means for modulating the transmission data to output a modulated signal; and

spreading means for spreading the modulated signal to output a spread signal.

15. A radio reception apparatus comprising:

receiving means for receiving a signal transmitted with a different plane of polarization,

electric field strength detecting means for detecting an electric field strength of the signal; and

determining means for making a data determination based on a detected result on the electric field strength.

16. The radio reception apparatus according to

claim 15

, wherein the determining means makes a determination on data itself at the time of strong electric field strength, while with respect to data at the time of weak electric field strength, inverting the data at the time of strong electric field strength to make a determination.

17. The radio reception apparatus according to

claim 15

, wherein the determining means comprises a D-flip flop receiving as its input data to be corrected and as its gate input a delayed judged result, and an X-NOR gate receiving as its inputs an output of the D-flip flop and the judged result.