METHOD AND SYSTEM OF PRELIMINARY CODING AND METHOD TO BUILD CODE BOOK OF PRELIMINARY CODING Russian patent published in 2013 - IPC H04L25/03 H03M7/00 

FIELD: radio engineering, communication.

SUBSTANCE: method of preliminary coding, and also a system and a method of building a code book of preliminary coding include the following: joint storage of information of the code book of preliminary coding by a transmitting end and a receiving end, selection of a code word from a code book of preliminary coding by the receiving end according to the assessed channel matrix and return of a serial number of the code word along a feedback channel to the transmitting end, definition of the code word by the transmitting end according to the serial number and preliminary coding with application of this code word, a unit of symbols sent to the receiving end; besides, at least eight vectors of code words or vectors of columns, at least in eight matrices of code words in the code book of preliminary coding are produced on the basis of 8-dimensional vectors selected from a set of 8-dimensional vectors, and this set of 8-dimensional vectors is produced by calculation from a part of or from all 4-dimensional vectors u₁ u₂, u_3; u₄, u₅, u₆, u₇, u_8, s, m, n.

EFFECT: improvement of working parameters of preliminary coding, when a channel matrix has a low range in a MIMO system, provision of memory space saving since only 4-dimensional vectors may be stored for calculation of code words.

13 cl, 7 dwg