Patent ID: 11895053
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method for a wireless device, the method comprising:
receiving a code division multiplexing, CDM, aggregation configuration for a CDM-8 design for a plurality of CSI-RS, Channel System Information-Reference Signal, antenna ports, the CDM aggregation configuration corresponding to an aggregated first set and second set of reference signal resources in a subframe, the first set and second set of reference signal resources, the CDM aggregation configuration being an aggregation of two CDM-4 orthogonal cover codes, the two CDM-4 orthogonal cover codes being selected from a constrained set of pairs that are selected to minimize loss of orthogonality of a length 8 cover code;
performing channel estimation based on the CDM aggregation configuration;
the first set and second set of reference signal resources satisfying a temporal criterion such that any two resource elements in the first set and second set of reference signal resources have up to a maximum time separation of six OFDM symbols; and
the first set and second set of reference signal resources satisfying a frequency criterion such that any two resource elements in the first set and second set of reference signal resources have up to a maximum frequency separation of six subcarriers.