Method and apparatus for adjusting transmission power of a CDMA terminal
AssigneeNEC Corporation
InventorMasaki Ichihara
Life of this patent
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Abstract
Variable gain circuits 16A and 16B are provided, respectively, on an output side of spreading circuits 15A and 15B disposed for each code channel, and after the outputs from the variable gain circuits 16A and 16B are added by adders 17 and 18, orthogonal modulation is applied to the outputs by a modulator 20, and a transmission signal is obtained. Furthermore, a variable gain circuit 22 for adjusting a level of the transmission signal is provided. An adjustment of average transmission power of the code channels is conducted by the variable again circuit 22, and an individual adjustment is conducted by the variable gain circuits 16A and 16B.
Claims40
A method of adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system and transmitting information using a plurality of code channels, said method comprising the steps of:
- generating base band signals and spreading data over a plurality of code channels, said data comprising in-phase components and orthogonal components of said base band signals;
- adjusting the levels of said in-phase components and said orthogonal components for each of the plurality of code channels;
- adding said in-phase components and said orthogonal components over said plurality of code channels;
- modulating the signals after addition to generate a high frequency signal;
- adjusting a level of said high frequency signal;
- and
- sending said adjusted high frequency signal.
An apparatus for adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, comprising:
- a plurality of spreading means for each code channel for spreading data;
- a plurality of first variable gain control means disposed for said each code channel for adjusting levels of output signals from said spreading means;
- an adder for adding outputs from each of said first variable gain control means;
- a modulator for modulating an output from said adder, and outputting a high frequency signal;
- and
- second variable gain control means for adjusting a level of said high frequency signal.
An apparatus for adjusting transmission power in a mobile station for code division multiple access communication with direct sequence system of spread spectrum system and transmitting information using a plurality of code channels, comprising:
- a plurality of spreading means disposed for each code channel, said spreading means for spreading data;
- a plurality of first variable gain control means disposed for said each code channel, said first variable gain control means for adjusting levels of output signals from said spreading means;
- adder for adding outputs from each of said first variable gain control means;
- modulator for modulating based on an output from said adder, and outputting a high frequency signal;
- second variable gain control means for adjusting a level of said high frequency signal;
- transmitter for sending an output signal from said second variable gain control means to the base station the other station;
- and
- control means for determining a level adjustment in quantity in each of said first variable gain control means and said second variable gain control means based on a control signal from said other station.
A method of adjusting transmission power in a CDMA terminal for code division multiple access communication in a spread spectrum system transmitting information using a plurality of code channels, said method comprising:
- generating base band signals by spreading data over every code channel;
- adjusting the level differences of said base band signals between code channels;
- adding said adjusted base band signals over said plurality of code channels;
- modulating said signal after addition to generate a high frequency signal;
- adjusting a total average level of said code channels and adjusting the levels of said high frequency signal;
- and
- sending said adjusted high frequency signal to an other station.
An apparatus of adjusting transmission power in a CDMA terminal for code division multiple access communication with spread spectrum system transmitting information using a plurality of code channels, comprising:
- a plurality of spreading means for spreading data disposed for each code channel;
- a plurality of first variable control means disposed for said each code channel, for adjusting output signal levels from said spreading means;
- adders for adding outputs from each of said first variable gain control means;
- modulator for modulating an output from said adder and outputting a high frequency signals;
- second variable gain control means for adjusting a level of said high frequency signal;
- and
- a control means for controlling said first variable gain control means and said second variable gain control means.
Dependencies are inferred from the claim text.