Radio communication apparatus, radio communication system and radio communication method

• US 9,414,436 B2
• Filed: 09/03/2013
• Issued: 08/09/2016
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sugiyama, Jun, Hirata, Shuya, Choraku, Tomohiko
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US14/016,731
• Publication Number:
  US 20140003351A1
• Time in Patent Office: 1,071 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 92/20 between access points

Abstract

A radio communication apparatus for performing radio communication, including: a first interface conversion unit which extracts a first signal and a second signal multiplexed and input, and corresponding to two different formats, and combines the extracted first and second signal; and a common amplifier which is shared by the first and second signal by amplifying the combined first and second signal, wherein a signal output from the common amplifier is transmitted.

Claims

1. A radio apparatus connectable to a radio control apparatus via a communication link, the radio apparatus comprising:

an extractor configured to extract a frequency combined baseband signal combined by a first signal of a first frequency bandwidth corresponding to a first communication format and a second signal of a second frequency bandwidth corresponding to a second communication format, from a reception signal received by an antenna;

a first time-frequency converter configured to convert an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis;

a second time-frequency converter configured to convert an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis; and

a transmitter configured to transmit the extracted and converted I signals and Q signals of the frequency combined baseband signal to the radio control apparatus via the communication link.

2. The radio apparatus according to claim 1, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).

3. A radio control apparatus connectable to a radio apparatus via a communication link, the radio control apparatus comprising:

a receiver configured to receive a frequency combined baseband signal combined by a first signal of a first frequency bandwidth corresponding to a first communication format and a second signal of a second frequency bandwidth corresponding to a second communication format, from the radio apparatus via the communication link;

a first time-frequency converter configured to convert an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis;

a second time-frequency converter configured to convert an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis; and

a separator configured to separate an I signal and a Q signal of the first frequency bandwidth corresponding to the first communication format and an I signal and a Q signal of the second frequency bandwidth corresponding to the second communication format, outputs the separated first signal element to a first processing unit configured to perform a process according to the first communication format, and output the separated second signal element to a second processing unit configured to perform a process according to the second communication format.

4. The radio control apparatus according to claim 3, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).

5. A radio communication method in a radio apparatus connectable to a radio control apparatus via a communication link, the method comprising:

extracting a frequency combined baseband signal combined by a first signal of a first frequency bandwidth corresponding to a first communication format and a second signal of a second frequency bandwidth corresponding to a second communication format, from a reception signal received by an antenna, by an extraction unit;

converting an I signal and a Q signal of the first signal on a time axis to a first I signal and Q signal on a frequency axis, by a first time-frequency converter;

converting an I signal and a Q signal of the second signal on a time axis to a second I signal and Q signal on a frequency axis, by a second time-frequency converter; and

transmitting the extracted and converted I signals and Q signals of the frequency combined baseband signal to the radio control apparatus via the communication link, by a transmission unit.

6. The radio communication method according to claim 5, wherein the first communication format is W-CDMA (Wideband Code Division Multiple Access), and the second communication format is LTE (Long Term Evolution).