Mobile station, base station, communication system, and communication method

• US 7,289,423 B2
• Filed: 08/21/2002
• Issued: 10/30/2007
• Est. Priority Date: 01/29/2002
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Niwano, Kazuhito
• Primary Examiner(s): Tran; CongVan
• Application Number:
  US10/472,493
• Publication Number:
  US 20040100925A1
• Time in Patent Office: 1,896 Days
• Field of Search: 370/328, 370/203, 370/522, 370/527, 370/529, 370/130, 375/130, 375/146, 375/148
• US Class Current: 370/203
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference

Abstract

When a scrambler (54) performs IQ multiplexing of output signals from a spreader 52 and a distributor 53 in order to generate a complex signal (I signal and Q signal), amplitude coefficients βcc(I) and βcc(Q) are determined in accordance with signal powers on I axis and Q axis.

Claims

1. A mobile station, comprising:

an IQ multiplexer configured to IQ multiplex transmission data for a data channel and control data for a control channel, and to generate a complex signal; and

a transmitter configured to modulate the complex signal generated by the IQ mutiplexer, and to transmit the modulated one, wherein

in the case of adding control data of an additional control channel, the IQ multiplexer distributes the control data for the additional control channel on I axis and Q axis in IQ multiplexing in order to generate a complex signal.

2. The mobile station according to claim 1, wherein in the case of adding control data of an additional control channel, the IQ multiplexer is configured to distribute the control data for the additional control channel on I axis and Q axis in consideration of a signal power of I axis and a signal power of Q axis.

3. The mobile station according to claim 1, wherein in the case of adding control data of additional control channel, the IQ multiplexer is configured to distribute the control data for the additional control channel on I axis and Q axis so that a signal power of I axis becomes equal to a signal power of Q axis.

4. The mobile station according to claim 1, wherein in the case of adding control data of an additional control channel, the IQ multiplexer is configured to assign the control data for the additional control channel to one axis whose signal power is smaller that that of the other axis in I axis and Q axis.

5. The mobile station according to claim 1, wherein in the case of adding control data of an additional control channel, the IQ multiplexer is configured to assign the control data for the additional control channel to Q axis.

6. A base station, comprising:

a receiver configured to receive a radio frequency signal transmitted from a mobile station, and the demodulate the radio frequency signal in order to output a complex signal;

an IQ separator configured to IQ separate the complex signal output from the receiver, and to output transmission data for a data channel, control data for a control channel, and control data for an additional control channel, wherein

when the control data for the additional control channel are distributed on I axis and Q axis, the IQ separator synthesizes the control data for the additional control channel distributed in I axis and Q axis and outputs the synthesized one.

7. A communication system, comprising:

a mobile station comprising;

an IQ multiplexer configured to IQ multiplex transmission data for a data channel and control data for a control channel, and to generate a complex signal; and

a transmitter configured to modulate the complex signal generated by the IQ multiplexer, and to transmit the modulated one; and

a base station comprising;

a receiver configured to receive the signal transmitted from the mobile station, and to demodulate the received signal in order to output the complex signal; and

an IQ separator configured to IQ separate the complex signal output from the receiver, and to output the transmission data for the data channel and the control data for the control channel, wherein

in the case of adding control data of an additional control channel, the IQ multiplexer in the mobile station is configured to distributed control data for an additional control channel on I axis and Q axis, and to perform the IQ multiplexing in order to generate the complex signal, and

when the control data for the additional control channel are distributed on I axis and Q axis, the IQ separator in the base station synthesizes the control data for the additional control channel distributed on I axis and Q axis and outputs the synthesized one.

8. A communication method comprising the steps of:

in a mobile station,

IQ multiplexing transmission data for a data channel and control data for a control channel in order to generate a complex signal; and

modulating and outputting the complex signal;

in a base station,

receiving the signal transmitted from the mobile station,

demodulating the received signal in order to generate the complex signal; and

IQ separation of the complex signal in order to output the transmission data for the data channel and the control data for the control channel, wherein

in the mobile station, when control data for an additional control channel are added, the control data for the additional control channel are distributed on I axis and Q axis, and the IQ multiplexing for the data is performed in order to generate the complex signal, and

in the base station, the control data for the additional control channel distributed on I axis and Q axis are synthesized, and the synthesized one are output when the control data for the additional control channel are distributed on I axis and Q axis.