Radio communication apparatus and radio communication method

• US 7,778,611 B2
• Filed: 05/23/2007
• Issued: 08/17/2010
• Est. Priority Date: 05/29/2006
• Status: Expired due to Fees

• Current Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology), NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology), NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Suyama, Satoshi, Yoshino, Hitoshi, Asai, Takahiro, Shi, Hui, Suzuki, Hiroshi, Fukawa, Kazuhiko
• Primary Examiner(s): Anderson; Matthew D
• Assistant Examiner(s): Tsvey; Gennadiy
• Application Number:
  US11/752,714
• Publication Number:
  US 20070274372A1
• Time in Patent Office: 1,182 Days
• Field of Search: 455/296, 455/24, 455/570, 455/78, 455/67.13, 455/562.1, 375/219, 375/144, 375/364, 370/278, 370/248
• US Class Current: 455/78
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence

Abstract

A radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, comprising: a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal; and a power suppressor for coupling loop interference signal for attenuating the signal power in order to suppress the coupling loop interference signal power that is contained in the signal.

Claims

1. A radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, the radio communication apparatus comprising:

a transceiver comprising a coupling loop interference signal removal function for an analog domain and a coupling loop interference signal removal function for a digital domain, for removing a coupling loop interference signal contained in a signal;

a power suppressor that couples loop interference signal for attenuating signal power of a signal generated following the analog domain coupling loop interference signal removal in order to suppress coupling loop interference signal power, wherein the power suppressor for coupling loop interference signal attenuates the signal power prior to the digital domain coupling loop interference signal removal in the transceiver;

an uplink analog signal processor that performs predetermined processing on a signal of the uplink analog domain, the uplink analog signal processor comprising a first fluctuation determiner for received signal power for determining received power fluctuation speed by using the output signal after uplink analog domain interference removal;

a downlink analog signal processor that performs predetermined processing on a signal of the downlink analog domain, the downlink analog signal processor comprising a second fluctuation determiner for received signal power for determining received power fluctuation speed by using the output signal after the downlink analog domain interference removal;

an uplink digital signal processor that performs predetermined processing on the signal of the uplink digital domain, the uplink digital signal processor comprising,

a first power determiner for residual interference signal for determining a ratio of the residual interference signal power in the output signal power after uplink digital domain interference removal, and

a first transmission propriety/impropriety decider for determining whether to perform simultaneous transmission and reception of signals at a predetermined uplink carrier frequency, on the basis of at least one of whether the received power fluctuation speed determined by the first fluctuation determiner for received signal power is equal to or more than a predetermined reference value and whether the ratio of the residual interference signal power determined by the first power determiner for residual interference signal is equal to or more than a predetermined reference ratio;

a downlink digital signal processor that performs predetermined processing on the signal of the downlink digital domain, the downlink digital signal processor comprising,

a second power determiner for residual interference signal for determining a ratio of the residual interference signal power in the output signal power after downlink digital domain interference removal; and

a second transmission propriety/impropriety decider for determining whether to perform simultaneous transmission and reception of signals at a predetermined downlink carrier frequency, on the basis of at least one of whether the received power fluctuation speed determined by the second fluctuation determiner for received signal power is equal to or more than a predetermined reference value and whether the ratio of the residual interference signal power determined by the second power determiner for residual interference signal is equal to or more than a predetermined reference ratio,

wherein the radio communication apparatus is configured to use a predetermined uplink carrier frequency to perform transmission and reception simultaneously by means of the uplink digital signal processor and the uplink analog signal processor, and is configured to use a predetermined downlink carrier frequency to perform transmission and reception simultaneously by means of the downlink digital signal processor and the downlink analog signal processor, and

wherein the radio communication apparatus is configured to control the simultaneous transmission and reception of signals at a predetermined uplink carrier frequency on the basis of the determination by the first transmission propriety/impropriety decider, and is configured to control the simultaneous transmission and reception of signals at a predetermined downlink carrier frequency on the basis of the determination by the second transmission propriety/impropriety decider.

2. The radio communication apparatus according to claim 1, wherein the transceiver further comprises a transmission RF signal processor, a received RF signal processor, and a baseband signal processor,

the radio communication apparatus further comprises a controller for power suppression for controlling at least one of magnitude of the signal power attenuated by the power suppressor for coupling loop interference signal, magnitude of the output power of the transmission RF signal processor, magnitude of the output power of the received RF signal processor, and magnitude of the output of the baseband signal processor, and

the controller for power suppression is configured to perform the control in response to at least one of the magnitude of the output power of the transmission RF signal processor, the magnitude of the output power of the received RF signal processor, and the magnitude of the output of the baseband signal processor.

3. The radio communication apparatus according to claim 1, wherein the radio communication apparatus separately comprises a transmission antenna and a reception antenna.

4. The radio communication apparatus according to claim 1, wherein the transceiver separately comprises an uplink signal processor that performs predetermined processing on an uplink signal and a downlink signal processor that performs predetermined processing on a downlink signal,

the radio communication apparatus separately comprises an antenna for communication with base stations and an antenna for communication with mobile stations, and

the radio communication apparatus is configured to perform predetermined processing, by means of the downlink signal processor, on the signal from the base station received by the antenna for communication with base stations and to transmit the processed signal from the antenna for communication with mobile stations, and is configured to perform predetermined processing, by means of the uplink signal processor, on the signal from the mobile station received by the antenna for communication with mobile stations and to transmit the processed signal from the antenna for communication with base stations.

5. A radio communication method for a radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, the method comprising:

performing a coupling loop interference signal removal processing for an analog domain and a coupling loop interference signal removal processing for a digital domain, to remove a coupling loop interference signal contained in a signal;

a power suppression step of attenuating signal power of a signal generated following the analog domain coupling loop interference signal removal processing to suppress coupling loop interference signal power;

an uplink analog signal processing step of performing predetermined processing on a signal of the uplink analog domain, the uplink analog signal processing step including determining received power fluctuation speed by using the output signal after uplink analog domain interference removal;

a downlink analog signal processing step of performing predetermined processing on a signal of the downlink analog domain, the downlink analog signal processing step including determining received power fluctuation speed by using the output signal after downlink analog domain interference removal;

an uplink digital signal processing step of performing predetermined processing on the signal of the uplink digital domain, the uplink digital signal processing step including determining received power fluctuation speed by using the output signal after uplink analog domain interference removal, determining a ratio of the residual interference signal power in the output signal power after uplink digital domain interference removal, and determining whether to perform simultaneous transmission and reception of signals at a predetermined uplink carrier frequency, on the basis of at least one of whether the received power fluctuation speed is equal to or more than a predetermined reference value and whether the ratio of the residual interference signal power is equal to or more than a predetermined reference ratio; and

a downlink digital signal processing step of performing predetermined processing on the signal of the downlink digital domain, the downlink digital signal processing step including determining a ratio of the residual interference signal power in the output signal power after downlink digital domain interference removal, and determining whether to perform simultaneous transmission and reception of signals at a predetermined downlink carrier frequency, on the basis of at least one of whether the received power fluctuation speed is equal to or more than a predetermined reference value and whether the ratio of the residual interference signal power is equal to or more than a predetermined reference ratio, wherein

the power suppression step, is performed prior to the digital domain coupling loop interference signal removal processing,

the radio communication apparatus uses a predetermined uplink carrier frequency to perform transmission and reception simultaneously in the uplink digital signal processing step and the uplink analog signal processing step, and the radio communication apparatus uses a predetermined downlink carrier frequency to perform transmission and reception simultaneously in the downlink digital signal processing step and the downlink analog signal processing step, and

the radio communication apparatus controls the simultaneous transmission and reception of signals at a predetermined uplink carrier frequency on the basis of the determination in the uplink digital signal processing step, and controls the simultaneous transmission and reception of signals at a predetermined downlink carrier frequency on the basis of the determination in the downlink digital signal processing step.

6. The radio communication method according to claim 5, further comprising a control step of performing control on at least one of magnitude of the signal power attenuated in the power suppression step, magnitude of the output power by transmission RF signal processing, magnitude of the output power by received RF signal processing, and magnitude of the output by baseband signal processing,

wherein the control step is performed in response to at least one of the magnitude of the output power by the transmission RF signal processing, the magnitude of the output power by the received RF signal processing, and the magnitude of the output by the baseband signal processing.