Transmit diversity using multiple spreading codes

Abstract

The present invention is a method for transmitting a data field of symbols. A data field of symbols is generated and spread using a first channelization code, producing a first spread data field. The data field is again spread using a second channelization code, producing a second spread data field. Each of the channelization codes are uniquely associated with one of a first and second antenna. Then an RF signal including the first and second spread data fields is transmitted over the first and second antenna.

What is claimed is:  
     
         1 . A method for a base station 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.    
     
     
         2 . The method of  claim 1  further comprising the steps of scrambling said first and second spread data fields by a scrambling code associated with said transmitter.  
     
     
         3 . A base station 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.    
     
     
         4 . The base station of  claim 3  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.  
     
     
         5 . A base station 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.    
     
     
         6 . 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.    
     
     
         7 . The method of  claim 6  further comprising the steps of scrambling said first and second spread data fields by a scrambling code associated with said transmitter.  
     
     
         8 . 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.    
     
     
         9 . The UE of  claim 8  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.  
     
     
         10 . 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.    
     
     
         11 . The UE of  claim 10  further comprising a means for scrambling said first and second spread data fields by a scrambling code associated with said transmitting means.  
     
     
         12 . A method for transmitting a data field of symbols 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.    
     
     
         13 . The method of  claim 12  further comprising the steps of scrambling said first and second spread data fields by a scrambling code associated with said transmitter.  
     
     
         14 . A transmitter for transmitting a data field of symbols 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.    
     
     
         15 . The transmitter of  claim 14  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.  
     
     
         16 . 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.    
     
     
         17 . The transmitter of  claim 16  further comprising a means for scrambling said first and second spread data fields by a scrambling code associated with said transmitting means.