Simple block space time transmit diversity using multiple spreading codes

Abstract

The present invention is a method and apparatus for a user equipment (UE) to transmit a data field of symbols. A first data field of symbols is generated and encoded d to produce a second data field having complex conjugates of the symbols of the data field. The first and second data fields are then spread, wherein the first data field is spread using a first channelization code and the second data field is spread using a second channelization code. Each of the channelization codes are uniquely associated with one of a first and second antenna. An RF signal including the first and second spread data fields is then transmitted over a first and second antenna.

What is claimed is:  
     
         1 . A method for a user equipment (UE) to transmit a data field of symbols comprising the steps of: 
 generating a first data field of symbols;    encoding said first data field producing a second data field having complex conjugates of the symbols of said data field;    spreading said first and second data fields, wherein said first data field is spread using a first channelization code and said second data field is spread using a second channelization code, each channelization code being uniquely associated with one of a first and second antennas; and    transmitting an RF signal including said first and second spread data fields over a first and second antenna.    
     
     
         2 . The method of  claim 1  further comprising the step of scrambling said first and second spread data fields by a scrambling code associated with said UE.  
     
     
         3 . The method of  claim 2  wherein the symbols of said first data field of symbols are grouped into a first and second sub-data field.  
     
     
         4 . The method of  claim 3 , wherein the symbols of said second data field of symbols are grouped into a third and fourth sub-data field, wherein said third sub-data field is the negative complex conjugate of said second sub-data field and said fourth sub-data field is the complex conjugate of said first sub-data field.  
     
     
         5 . A user equipment (UE) including a transmitter for transmitting a data field of symbols, the transmitter comprising: 
 a first and second antenna for transmitting said data field of symbols;    an encoder for encoding said data field producing a second data field having complex conjugates of the symbols of said data field; and    a first and second spreading device for spreading said first and second data fields, wherein said first spreading device spreads said first data field using a first channelization code and said second spreading device spreads said second data field using a second channelization code, each channelization code being uniquely associated with one of said first and second antennas.    
     
     
         6 . The UE of  claim 5  wherein said transmitter further comprises a first and second scrambling device for scrambling said first and second spread data fields by a single scrambling code associated with said transmitter.  
     
     
         7 . The UE of  claim 6  wherein the symbols of said first data field of symbols are grouped into a first and second sub-data field.  
     
     
         8 . The UE of  claim 7 , wherein the symbols of said second data field of symbols are grouped into a third and fourth sub-data field, said third sub-data field being the negative complex conjugate of said second sub-data field and said fourth sub-data field being the complex conjugate of said first sub-data field.  
     
     
         9 . A user equipment (UE) including a transmitter comprising a transmitter including: 
 a first and second means for transmitting a data field of symbols including a first data field;    a means for encoding said data field producing a second data field having complex conjugates of the symbols of said data field; and    a first and second spreading means for spreading said first and second data fields, wherein said first spreading means spreads said first data field using a first channelization code and said second spreading means spreads said second data field using a second channelization code, each channelization code being uniquely associated with one of said first and second transmitting means.    
     
     
         10 . The UE of  claim 9  wherein said transmitter further comprises a means for scrambling said first and second spread data fields by a scrambling code associated with said transmitting means.  
     
     
         11 . The UE of  claim 10  wherein the symbols of said first data field of symbols are grouped into a first and second sub-data field.  
     
     
         12 . The UE of  claim 11 , wherein the symbols of said second data field of symbols are grouped into a third and fourth sub-data field, wherein said third sub-data field is the negative complex conjugate of said second sub-data field and said fourth sub-data field is the complex conjugate of said first sub-data field.  
     
     
         13 . A method for a user equipment (UE) to transmit a data field of symbols including a transmitter, the method comprising the steps of: 
 generating a data field of symbols;    spreading said first data field using a first channelization code producing a first spread data field;    spreading said first data field using a second channelization code producing a second spread data field, each channelization code being uniquely associated with one of a first and second antennas; and    transmitting an RF signal including said first and second spread data fields over a first and second antenna.    
     
     
         14 . The method of  claim 13  further comprising the steps of scrambling said first and second spread data fields by a scrambling code associated with said transmitter.  
     
     
         15 . A user equipment (UE) including a transmitter for transmitting a data field of symbols, the transmitter comprising: 
 a first and second antenna for transmitting said data field of symbols; and    a first and second spreading device for spreading said data field, wherein said first spreading device spreads said data field using a first channelization code, producing a first spread data field, and said second spreading device spreads said data field using a second channelization code, producing a second spread data field, each channelization code being uniquely associated with one of said first and second antennas.    
     
     
         16 . The UE of  claim 15  further comprising a first and second scrambling device for scrambling said first and second spread data fields by a single scrambling code associated with said transmitter.  
     
     
         17 . A user equipment (UE) including a transmitter comprising: 
 a first and second means for transmitting a data field of symbols; and    a first and second spreading means for spreading said data field, wherein said first spreading means spreads said data field using a first channelization code producing a first spread data field and said second spreading means spreads said second data field using a second channelization code producing a second spread data field, each channelization code being uniquely associated with one of said first and second transmitting means.    
     
     
         18 . The UE of  claim 17  further comprising a means for scrambling said first and second spread data fields by a scrambling code associated with said transmitting means.