Transmit Diversity Scheme

Abstract

The present invention relates to methods for implementing transmit diversity in a telecommunication network. In particular there is provided an algorithm for performing transmit diversity encoding in a transmitter ( 100 ) and transmit diversity decoding in a receiver ( 1700 ) respectively. In the method processed pairs of data blocks ( 314.1 A, 314.1 B) are transmitted on a first antenna ( 112.1 ) on N sub-carriers in a first temporal order; and a second antenna ( 112.2 ) in the reverse temporal order.

1 . A base station used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the base station comprising:
 a transmitting unit to transmit a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         2 . The base station as in  claim 1 , wherein the data symbols are applicable to a single user. 
     
     
         3 . The base station as in  claim 1 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         4 . User equipment used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the user equipment comprising:
 a receiving unit to receive a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         5 . The user equipment as in  claim 4 , wherein the data symbols are applicable to a single user. 
     
     
         6 . The user equipment as in  claim 4 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         7 . A telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the telecommunications network comprising:
 user equipment; and   a transmitting unit to transmit to the user equipment a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         8 . The telecommunications network as in  claim 7 , wherein the data symbols are applicable to a single user. 
     
     
         9 . The telecommunications network as in  claim 7 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         10 . A method implemented in a base station used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the method comprising:
 transmitting a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         11 . The method as in  claim 10 , wherein the data symbols are applicable to a single user. 
     
     
         12 . The method as in  claim 10 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         13 . A method implemented in user equipment used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the method comprising:
 receiving a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         14 . The method as in  claim 13 , wherein the data symbols are applicable to a single user. 
     
     
         15 . The method as in  claim 13 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         16 . A method used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the method comprising:
 transmitting a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         17 . The method as in  claim 16 , wherein the data symbols are applicable to a single user. 
     
     
         18 . The method as in  claim 16 , wherein the first block is adjacent to the second block in a time domain. 
     
     
         19 . A base station used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the base station comprising:
 transmitting means for transmitting a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.   
     
     
         20 . User equipment used in a telecommunications network where data symbols are transmitted over a wireless channel including N sub-carriers having different frequencies through a plurality of antennas, the user equipment comprising:
 receiving means for receiving a first block and a second block, each block including one data symbol corresponding to one of the N sub-carriers and the first block is adjacent to the second block in a chunk,   wherein the second block for a second antenna is a complex conjugate of the first block for a first antenna and the first block for the second antenna is an additive inverse of a complex conjugate of the second block for the first antenna.