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

• US 8,064,326 B2
• Filed: 10/31/2007
• Issued: 11/22/2011
• 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): Yao; Kwang B
• Assistant Examiner(s): Kao; Jutai
• Application Number:
  US11/980,445
• Publication Number:
  US 20080069056A1
• Time in Patent Office: 1,483 Days
• Field of Search: None
• US Class Current: 370/206
• 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

A scrambler performs IQ multiplexing of output signals from a spreader and a distributor 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 base station comprising:

receiving means for receiving a radio frequency signal transmitted from a mobile station, and for demodulating the radio frequency signal in order to output a complex signal; and

IQ separation means for performing IQ separation on the complex signal outputted from the receiving means, and for outputting transmission data for a data channel, control data for a control channel, and additional control data for an additional control channel,

wherein when the additional control data for the additional control channel are assigned to an I axis or a Q axis, the IQ separation means separates the additional control data on the I axis or on the Q axis from the complex signal, and outputs the separated additional control data.

2. A receiving method comprising the steps of:

receiving a radio frequency signal transmitted from a mobile station;

demodulating the radio frequency signal in order to output a complex signal;

performing IQ separation on the complex signal output from said step of receiving; and

outputting transmission data for a data channel, control data for a control channel, and additional control data for an additional control channel,

wherein when the additional control data for the additional control channel are assigned to an I axis or a Q axis, the additional control data on the I axis or on the Q axis are separated from the complex signal in said step of performing IQ separation, and the separated additional control data is output.

3. A base station comprising:

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

IQ separation processor configured to perform IQ separation on the complex signal outputted from the receiver, and configured to output transmission data for a data channel, control data for a control channel, and additional control data for an additional control channel,

wherein when the additional control data for the additional control channel are assigned to an I axis or a Q axis, the IQ separation processor separates the additional control data on the I axis or on the Q axis from the complex signal, and outputs the separated additional control data.