Radio communication terminal

• US 8,879,499 B2
• Filed: 11/24/2010
• Issued: 11/04/2014
• Est. Priority Date: 12/03/2009
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Oka, Shinya, Okada, Takashi
• Primary Examiner(s): Ly, Anh-Vu
• Assistant Examiner(s): LOPEZ-VARGAS, GUSTAVO E
• Application Number:
  US13/512,397
• Publication Number:
  US 20120230228A1
• Time in Patent Office: 1,441 Days
• Field of Search: None
• US Class Current: 370/330
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/0067 with one or more circuit blocks in common for different bands
• CPC Class Codes: H04B 1/0483 Transmitters with multiple parallel paths

Abstract

A mobile communication terminal (100) has a path (T1) that supplies first and second upward link modulated transmission signals from a modulator-demodulator circuit (200) via a transmission filter (110A) to an adder (150), and a path (T2) that supplies signals via transmission filter (110B) to adder (150) depending on frequencies of signals. The adder (150) adds transmission signals supplied from the path (T1) and from the path (T2) and simultaneously sends them out via a transmitting and receiving antenna (101). The mobile communication terminal (100) supplies first and second forward link modulated reception signals received by transmitting and receiving antenna (101) via a reception filter (120) to the modulator-demodulator circuit (200).

Claims

1. A radio communication terminal comprising:

a modulation unit for generating a first upward link modulated transmission signal transmitted by a first upward link frequency belonging to a first upward band used for upward link communication in both of a first radio communication network and a second radio communication network, and for generating a second upward link modulated transmission signal transmitted by a second upward link frequency belonging to a second upward band used for upward link communication in said second radio communication network;

a first transmission bandpass filter that passes a frequency component belonging to said first upward band;

a second transmission bandpass filter that passes a frequency component belonging to said second upward band;

a duplexer that passes a frequency component belonging to said first upward band so that said first upward link modulated transmission signal passes through said first transmission bandpass filter, and that passes a frequency component belonging to said second upward band so that said second upward link modulated transmission signal passes through said second transmission bandpass filter;

a combiner that combines said first upward link modulated transmission signal that has passed through said first transmission bandpass filter and said second upward link modulated transmission signal that has passed through said second transmission bandpass filter;

a transmitter antenna that simultaneously transmits said first upward link modulated transmission signal and said second upward link modulated transmission signal;

a receiver antenna that simultaneously receives a first forward link modulated reception signal modulated by a first forward link frequency belonging to a first forward band used in forward link communication in both the first radio communication network and the second radio communication network and a second forward link modulated reception signal modulated by a second forward link frequency belonging to a second forward band used for forward link communication in said second radio communication network, said first forward band and said second forward band being contiguous;

a reception bandpass filter that passes a frequency component belonging to said first forward band and a frequency component belonging to said second forward band from the receiver antenna; and

a demodulation unit for generating a first reception signal by demodulating said first forward link modulated reception signal that has passed through said reception bandpass filter and for generating a second reception signal by demodulating said second forward link modulated reception signal that has passed through said reception bandpass filter.

2. A radio communication terminal comprising:

circuitry configured to generate a first upward link modulated transmission signal transmitted by a first upward link frequency belonging to a first upward band used for upward link communication in both of a first radio communication network and a second radio communication network, and generate a second upward link modulated transmission signal transmitted by a second upward link frequency belonging to a second upward band used for upward link communication in said second radio communication network;

a first transmission bandpass filter configured to pass a frequency component belonging to said first upward band;

a second transmission bandpass filter configured to pass a frequency component belonging to said second upward band;

a duplexer configured to pass a frequency component belonging to said first upward band so that said first upward link modulated transmission signal passes through said first transmission bandpass filter, and pass a frequency component belonging to said second upward band so that said second upward link modulated transmission signal passes through said second transmission bandpass filter;

a combiner configured to combine said first upward link modulated transmission signal that has passed through said first transmission bandpass filter and said second upward link modulated transmission signal that has passed through said second transmission bandpass filter;

a transmitter antenna configured to simultaneously transmit said first upward link modulated transmission signal and said second upward link modulated transmission signal;

a receiver antenna configured to simultaneously receive a first forward link modulated reception signal modulated by a first forward link frequency belonging to a first forward band used in forward link communication in both the first radio communication network and the second radio communication network and a second forward link modulated reception signal modulated by a second forward link frequency belonging to a second forward band used for forward link communication in said second radio communication network, said first forward band and said second forward band being contiguous; and

a reception bandpass filter configured to pass a frequency component belonging to said first forward band and a frequency component belonging to said second forward band from the receiver antenna, wherein

the circuitry is further configured to generate a first reception signal by demodulating said first forward link modulated reception signal that has passed through said reception bandpass filter and generate a second reception signal by demodulating said second forward link modulated reception signal that has passed through said reception bandpass filter.