US2012002750A1PendingUtilityA1

Method and Apparatus for Codebook-Based Precoding in MIMO Systems

52
Assignee: HOOLI KARI JUHANIPriority: Mar 17, 2009Filed: Mar 17, 2009Published: Jan 5, 2012
Est. expiryMar 17, 2029(~2.6 yrs left)· nominal 20-yr term from priority
Inventors:Kari Juhani HooliKari Pekka PajukoskiEsa Tapani Tiirola
H04B 7/0469H04B 7/0426H04B 7/0691H04B 7/0639H04B 7/0619H04B 7/0473H04B 7/0417H04B 7/046H04B 7/0486
52
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Claims

Abstract

A method including using a precoding code book for controlling transmissions from four antennas of a device, said code book including a plurality of entries, wherein said entries are such that a single layer is mapped to each selected antenna, said code book entries including different antenna pair combinations whereby one or two antenna pairs are selected for transmission.

Claims

exact text as granted — not AI-modified
1 . A method comprising:
 using a precoding code book for controlling transmissions from four antennas of a device, said code book comprising a plurality of entries, wherein said entries are such that a single layer is mapped to each selected antenna, said code book entries comprising different antenna pair combinations whereby one or two antenna pairs are selected for transmission.   
     
     
         2 . A method as claimed in  claim 1 , comprising providing a plurality of precoding books, each of said precoding books being associated with a respective rank. 
     
     
         3 . A method as claimed in  claim 2 , comprising providing four precoding books for ranks 1 to 4. 
     
     
         4 . A method as claimed in  claim 3 , wherein a size of a codebook of one rank is different from a size of a codebook of at least one other rank. 
     
     
         5 . A method as claimed in  claim 4 , wherein a size of a codebook of one rank is bigger than a size of a codebook of a higher rank. 
     
     
         6 . A method as claimed in any of  claim 2 , comprising determining a rank and selecting one of a plurality of codebooks in dependence on the determined rank. 
     
     
         7 . A method as claimed in  claim 6 , comprising determining the rank is one and selecting an associated codebook which allocates said antenna to the same layer. 
     
     
         8 . A method as claimed in  claim 6 , comprising determining the rank is two and selecting an associated codebook which allocated two antenna to each layer. 
     
     
         9 . A method as claimed in  claim 6 , comprising determining that the rank is three and selecting an associated codebook which allocates two antenna to one layer and a single antenna to each of two other layers. 
     
     
         10 . A method as claimed in  claim 1 , wherein a plurality of entries of at least one precoding book is arranged to divide said antennas into at least one pair, with at least one pair having the same phase rotation. 
     
     
         11 . A method as claimed in  claim 1 , wherein a plurality of entries of at least precoding book is arranged to divide said antenna into at least one pair, with different antenna in at least one pair having different phase rotation. 
     
     
         12 . A method as claimed in  claim 1 , wherein at least a plurality of different entries of at least one precoding book provide different respective phase rotation combinations. 
     
     
         13 . A method as claimed in  claim 1 , wherein a plurality of entries of at least one precoding book is arranged to only use one pair of said antennas. 
     
     
         14 . A method as claimed in  claim 1 , comprising controlling power with which an antenna transmits in accordance with a number of antenna which are transmitting at the same time. 
     
     
         15 . A method as claimed in  claim 1 , wherein at least one antenna pair is arranged in accordance with spatial correlation properties of said antennas. 
     
     
         16 . A method as claimed in  claim 15 , wherein said different spatial correlation properties comprise at least one of antenna polarization and antenna position. 
     
     
         17 . Method as claimed in  claim 1 , wherein at least one entry in said codebook provides transmit diversity applied over two antennas of a selected antenna pair. 
     
     
         18 . A method as claimed in  claim 1 , comprising transmitting at least one transport block from a plurality of antenna. 
     
     
         19 . A computer program comprising program code means adapted to perform the steps of  claim 1 . 
     
     
         20 . Apparatus comprising:
 a processor configured to use a precoding code book for controlling transmissions from four antennas of a device, said code book comprising a plurality of entries, wherein said entries are such that a single layer is mapped to each selected antenna, said code book entries comprising different antenna pair combinations whereby one or two antenna pairs are selected for transmission.   
     
     
         21 . Apparatus as claimed in  claim 20 , wherein said processor is configured to control power with which an antenna transmits in accordance with a number of antenna which are transmitting at the same time. 
     
     
         22 . Apparatus as claimed in  claim 20 , wherein said processor is configured to control the transmission of at least one transport block from a plurality of antenna and further configured to control power with which an antenna transmits in accordance with a number of antenna which are transmitting at the same time. 
     
     
         23 . Apparatus comprising:
 a processor configured to select one of a plurality of entries in a precoding code book for controlling transmissions from four antennas of a device, wherein said entries are such that a single layer is mapped to each selected antenna, said code book entries comprising different antenna pair combinations whereby one or two antenna pairs are configured to be selected for transmission.   
     
     
         24 . Apparatus as claimed in  claim 23 , wherein said processor is configured to determine a rank and selecting one of a plurality of codebooks in dependence on the determined rank. 
     
     
         25 . Apparatus as claimed in  claim 24 , wherein said processor is configured, when the rank is determined to be one to select an associated codebook which allocates said antenna to the same layer. 
     
     
         26 . Apparatus as claimed in  claim 24 , wherein said processor is configured, when the rank is determined to be two to select an associated codebook which allocates two antenna to each layer. 
     
     
         27 . Apparatus as claimed in  claim 25 , wherein said processor is configured, when the rank is determined to be three to select an associated codebook which allocates two antenna to one layer and a single antenna to each of two other layers. 
     
     
         28 . Apparatus as claimed in  claim 20 , comprising a memory storing a plurality of precoding books, each of said precoding books being associated with a respective rank. 
     
     
         29 . Apparatus as claimed in  claim 28 , wherein four precoding books for ranks 1 to 4 are provided. 
     
     
         30 . Apparatus as claimed in  claim 28 , wherein a size of a codebook of one rank is different from a size of a codebook of at least one other rank. 
     
     
         31 . Apparatus as claimed in  claim 30 , wherein a size of a codebook of one rank is bigger than a size of a codebook of a higher rank. 
     
     
         32 . Apparatus as claimed in  claim 20 , wherein a plurality of entries of at least one precoding book is arranged to divide said antennas into at least one pair, with at least one pair having the same phase rotation. 
     
     
         33 . Apparatus as claimed in  claim 20 , wherein a plurality of entries of at least precoding book is arranged to divide said antenna into at least one pair, with different antenna in at least one pair having different phase rotation. 
     
     
         34 . Apparatus as claimed in  claim 20 , wherein at least a plurality of different entries of at least one precoding book provide different respective phase rotation combinations. 
     
     
         35 . Apparatus as claimed in  claim 20 , wherein a plurality of entries of at least one precoding book is arranged to only use one pair of said antennas. 
     
     
         36 . Apparatus as claimed in  claim 20 , wherein at least one antenna pair entry is arranged in accordance with spatial correlation properties of said antennas. 
     
     
         37 . Apparatus as claimed in  claim 20 , wherein said different spatial correlation properties comprise at least one of antenna polarization and antenna position. 
     
     
         38 . Apparatus as claimed in  claim 20 , wherein at least one entry in said codebook provides transmit diversity applied over two antennas of a selected antenna pair. 
     
     
         39 . An integrated circuit or chip set comprising an apparatus as claimed in  claim 20 . 
     
     
         40 . A user equipment comprising an apparatus as claimed in  claim 20 . 
     
     
         41 . (canceled) 
     
     
         42 . A base station comprising an apparatus as claimed in  claim 23 .

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