Apparatus and Method for Modulating Data Message By Employing Orthogonal Variable Spreading Factor (OVSF) Codes in Mobile Communication System

Abstract

A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal.

1 - 82 . (canceled) 
     
     
         83 . A mobile station, capable of using a plurality of data channels and a control channel, that converts source data to a channel-modulated signal, the mobile station comprising one or more processors programmed to:
 encode the source data to generate a plurality of data parts and a control part, wherein the data parts are allocated to the data channels and the control part is allocated to the control channel;   generate spreading codes to be allocated to the channels, wherein each of the spreading codes is generated on the basis of a spreading factor related to a data rate for the respective channel and a code number for the respective channel, wherein the step of generating spreading codes to be allocated to the channels comprises:
 consecutively producing a count value in synchronization with a clock signal, 
 in response to the count value and the spreading factor for each data channel, generating the spreading code to be allocated to each data channel, and 
 in response to the count value and the spreading factor for the control channel, generating the spreading code to be allocated to the control channel; and 
   spread the control channel and the data channels using the allocated spreading codes to thereby generate the channel-modulated signal, wherein:
 the spreading codes correspond to orthogonal variable spreading factor (OVSF) codes, 
 the spreading code allocated to the control channel is represented by C 256,0 , where 256 denotes the spreading factor and 0 the code number, 
 the spreading codes allocated to first and second data channels are represented by C 4, 1 . 
   
     
     
         84 . The mobile station of  claim 83 , wherein the step of generating the spreading code to be allocated to each data channel comprises:
 in response to the count value, carrying out a first logical operation with the spreading factor for the respective data channel and the code number for the respective data channel, to thereby generate the spreading code to be allocated to the respective data channel; and   outputting the spreading code to be allocated to the respective data channel in response to a first select signal.   
     
     
         85 . The mobile station of  claim 84 , wherein a code number of I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 , a count value of B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 , and a predetermined spreading factor are received for the first logical operation, and wherein the first logical operation is 
       
         
           
             
               
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       if the predetermined spreading factor is 2 N  where N is 2 to 8. 
     
     
         86 . The mobile station of  claim 84 , wherein the code number to be used in the first logical operation is represented by I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 , wherein the count value to be used in the first logical operation is represented by B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 , and wherein the second logical operation is 
       
         
           
             
               
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       where the spreading factor is 2 N  and N is 2 to 8. 
     
     
         87 . The mobile station of  claim 86 , wherein the step of generating the spreading code to be allocated to the control channel comprises:
 in response to the count value, carrying out a second logical operation with the spreading factor for the control channel and the code number for the control channel, to thereby generate the spreading code to be allocated to the control channel; and   outputting the spreading code to be allocated to the control channel in response to a second select signal.   
     
     
         88 . The mobile station of  claim 87 , wherein the code number to be used in the second logical operation is represented by I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 , wherein the count value to be used in the second logical operation is represented by B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 , and wherein the second logical operation is 
       
         
           
             
               
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                   i 
                   = 
                   0 
                 
                 
                   N 
                   - 
                   1 
                 
               
                
               
                   
               
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                     I 
                     i 
                   
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                       N 
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       where the spreading factor is 2 N  and N is 2 to 8. 
     
     
         89 . The mobile station of  claim 88 , wherein C 4, 1  represents {1, 1, −1, −1}. 
     
     
         90 . The mobile station of  claim 89 , wherein the one or more processors are programmed to:
 in response to the spreading factor, generate the code numbers for the channels.   
     
     
         91 . The mobile station of  claim 83 , wherein the step of generating the spreading code to be allocated to the control channel comprises:
 in response to the count value, carrying out a second logical operation with the spreading factor for the control channel and the code number for the control channel, to thereby generate the spreading code to be allocated to the control channel; and   outputting the spreading code to be allocated to the control channel in response to a second select signal.   
     
     
         92 . The mobile station of  claim 91 , wherein a code number of I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 , a count value of B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 , and a predetermined spreading factor are received for the second logical operation, and wherein the second logical operation is 
       
         
           
             
               
                 ∏ 
                 
                   i 
                   = 
                   0 
                 
                 
                   N 
                   - 
                   1 
                 
               
                
               
                   
               
                
               
                 ⊕ 
                 
                   
                     I 
                     i 
                   
                   · 
                   
                     B 
                     
                       N 
                       - 
                       1 
                       - 
                       i 
                     
                   
                 
               
             
           
         
       
       if the predetermined spreading factor is 2 N  where N is 2 to 8. 
     
     
         93 . The mobile station of  claim 91 , wherein the code number to be used in the second logical operation is represented by I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0 , wherein the count value to be used in the second logical operation is represented by B 7 B 6 B 5 B 4 B 3 B 2 B 1 B 0 , and wherein the second logical operation is 
       
         
           
             
               
                 ∏ 
                 
                   i 
                   = 
                   0 
                 
                 
                   N 
                   - 
                   1 
                 
               
                
               
                   
               
                
               
                 ⊕ 
                 
                   
                     I 
                     i 
                   
                   · 
                   
                     B 
                     
                       N 
                       - 
                       1 
                       - 
                       i 
                     
                   
                 
               
             
           
         
       
       where the spreading factor is 2 N  and N is 2 to 8. 
     
     
         94 . The mobile station of  claim 83 , wherein C 4, 1  represents {1, 1, −1, −1}. 
     
     
         95 . The mobile station of  claim 83 , wherein C 4, 1  is represented by a series of a pair of positive one integer and a pair of negative one integer. 
     
     
         96 . The mobile station of  claim 83 , wherein the one or more processors are programmed to:
 in response to the spreading factor, generate the code numbers for the channels.   
     
     
         97 . A mobile station as in any one of  claim 83 - 96 , wherein the channel-modulated signal has a plurality of pairs of in-phase (I) and quadrature-phase (Q) data and wherein the spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on the same point or symmetrical with respect to a zero point on a phase domain.