Patent ID: 11876581
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The method of claim 1 wherein:
each entry of the advanced CSI codebook of coefficients is identified by an index k;
the entry of the advanced CSI codebook of coefficients with index k comprises (L′−1)r complex variables, each of which can be one of N complex values, with L′>0 and r>1 being integers;
a matrix Ck corresponding to the index k with r columns having a first row with each element of the row being ‘1’ and the remaining rows containing the (L′−1)r scalar complex variables such that
CkHCk=I for each k, where ckH is the Hermitian transpose of Ck and CkHCk is a matrix product, and I is the identity matrix; and

the subset of codebook entries comprises KM entries out of N(L′-1)r entries in the advanced CSI codebook of coefficients, where K≤N and M<(L′−1)r are positive integers.