Radio Relay Device and Method

• US 20100136900A1
• Filed: 12/01/2009
• Published: 06/03/2010
• Est. Priority Date: 12/02/2008
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: SEKI, Hiroyuki
• Application Number:
  US12/628,781
• Publication Number:
  US 20100136900A1
• Time in Patent Office: Days
• US Class Current: 455/9
• CPC Class Codes: H04B 7/15578 by gain adjustment
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A radio relay method for relaying and transmitting a received radio signal, including receiving the radio signal as a first received signal through a first antenna, outputting a first gain controlled signal which controls gain of the first received signal, transmitting a first relay signal which amplifies the first gain controlled signal, receiving the radio signal as a second received signal through a second antenna, outputting a second gain controlled signal which controls gain of the second received signal, transmitting a second relay signal which amplifies the second gain controlled signal. Father including generating a first wait which is used to remove self interference from the first received signal, based on the first and second gain controlled signals and the first input signal used to control the gain, and removing the self interference from the first received signal based on the first wait.

Claims

1. A radio relay device which relays and transmits a received radio signal, comprising:

a first receiving part which receives the radio signal through a first antenna;

a first gain control part which controls gain of a first received signal which is received by the first receiving part;

a first transmitting part which transmits a first relay signal which is obtained by amplifying an output signal of the first gain control part;

a second receiving part which receives the radio signal through a second antenna;

a second gain control part which controls gain of a second received signal which is received by the second receiving part,

a second transmitting part which transmits a second relay signal which is obtained by amplifying an output signal of the second gain control part;

a first generating part which generates, based on the output signals of the first and second gain control parts and on the signal which is input to the first gain control part;

a first wait which is used to remove a self interference from the first received signal;

a first self interference removing part which removes the self interference from the first received signal based on the first wait;

a second generating part which generates, based on the output signals of the first and second gain control parts and on the signal which is input to the second gain control part;

a second wait which is used to remove the self interference from the second received signal; and

a second self interference removing part which removes the self interference from the second received signal based on the second wait.

2. The radio relay deice according to claim 1, wherein the first wait is calculated as a rate of a case where signal power of the output signal of the first self interference removing part is minimized, and

wherein the second wait is calculated as a rate of a case where the signal power of the output signal of the second self interference removing part is minimized.

3. The radio relay device according to claim 1, wherein the first self interference removing part removes a signal which is obtained by multiplying the first wait by a total of the output signals of first and second gain control parts from the first received signal, and

wherein the second self interference removing part removes a signal which is obtained by multiplying the second wait by a total of the output signals of the first and second gain control parts from the second received signal.

4. The radio relay device according to claim 1, wherein the first gain control part controls, with respect to the output signal of the first self interference removing part, in such a way that gain with respect to a band of a first communication method is larger than the gain with respect to the band of a second communication method, and

wherein the second gain control part controls the gain in such a way that, among the output signals of the second self interference removing part, the gain with respect to the band of the first communication method is zero, and that the gain with respect to the band of the second communication method is equal to the band of the second communication method which is controlled by the first gain control part.

5. The radio relay device according to claim 1, wherein the first gain control part controls, with respect to the output signal of the first self interference removing part, in such a way that the gain with respect to the band of the first communication method is equal to the band with respect to the band of the second communication method, and

wherein the second gain control part controls the gain in such a way that, among the output signals of the second self interference removing part, the gain with respect to the band of the first communication method is zero, and that the gain with respect to the band of the second communication method is equal to the band of the second communication method which is controlled by the first gain control part.

6. The radio relay device according to claim 5, wherein the first communication method is a non multi-input/multi-output communication method, and the second communication method is a multi-input/multi-output communication method.

7. The radio relay device according to claim 1, wherein the radio relay device further comprises an allocation information receiving part which receives allocation information, transmitted by another radio device, of the band of the first communication method and the band of the second communication method, and reports the allocation information to the first gain control part and the second gain control part, and

wherein the first gain control part and the second gain control part control the gain based on the allocation information.

8. A radio relay device which relays and transmits a received radio signal, comprising:

a first receiving part which receives the radio signal through a first antenna;

a first band selection part which selects both a band of a first communication method and the band of a second communication method as a band of a first received signal received by the first receiving part;

a first transmitting part which transmits a first relay signal which is obtained by amplifying an output signal of the band selected by the first band selection part;

a second receiving part which receives the radio signal through a second antenna;

a second band selection part which selects the band of the first communication method as a band of a second received signal received by the second receiving part;

a second transmitting part which transmits an output signal of the band of the second communication method among the bands selected by the first band selection part and a second relay signal obtained by amplifying the output signal;

a first generating part which generates a first wait used to remove a self interference from the first received signal which includes the first relay signal and the second relay signal as a sneak wave based on the output signal of the first band selection part and the second band selection part and a signal to be input to the first band selection part;

a first self interference removing part which removes the self interference from the first received signal based on the first wait;

a second generating part which generates a second wait used to subtract the sneak wave from the second received signal which includes the sneak wave based on the output signal of the first band selection part and the second band selection part and a signal to be input to the second band selection part; and

a second self interference removing part which removes the self interference removing from the second received signal based on the second wait.

9. The radio relay device according to claim 8, wherein the first communication method is a non multi-input/multi-output communication method, and the second communication method is a multi-input/multi-output communication method.

10. A radio relay method for relaying and transmitting a received radio signal, comprising:

receiving the radio signal as a first received signal through a first antenna;

outputting a first gain controlled signal which controls gain of the first received signal;

transmitting a first relay signal which is obtained by amplifying the first gain controlled signal;

receiving the radio signal as a second received signal through a second antenna;

outputting a second gain controlled signal which controls gain of the second received signal;

transmitting a second relay signal which is obtained by amplifying the second gain controlled signal;

generating a first wait which is used to remove the self interference from the first received signal based on the first and second gain controlled signals and the first input signal used to control the gain;

removing the self interference from the first received signal based on the first wait;

generating a second wait which is used to remove the self interference from the second received signal based on the first and second gain controlled signals and the second input signal used to control the gain; and

removing the self interference from the second received signal based on the second wait.

11. The radio relay method according to claim 10, wherein the first gain controlled signal controls gain, with respect to the first signal which removes the self interference, in such a way that the gain with respect to the band of the first communication method is larger than the gain with respect to the band of the second communication method, and

wherein the second gain controlled signal controls the gain in such a way that, among the second signals from which the self interference is removed, the gain with respect to the band of the first communication method is zero, and that the gain with respect to the band of the second communication method is equal to the band of the second communication method which is controlled by the first gain controlled signal.

12. The radio relay method according to claim 10, wherein the first gain controlled signal controls gain, with respect to the first signal which removes the self interference, in such a way that the gain with respect to the band of the first communication method is equal to the gain with respect to the band of the second communication method, and

wherein the second gain controlled signal controls the gain in such a way that, among the second signals from which the self interference is removed, the gain with respect to the band of the first communication method is zero, and that the gain with respect to the band of the second communication method is equal to the band of the second communication method which is controlled by the first gain control signal.