METHOD AND SYSTEM FOR MAPPING PILOT SIGNALS IN MULTI-STREAM TRANSMISSIONS

摘要

A base station comprises a downlink transmit path comprising circuitry configured to transmit a plurality of reference signals in two or more subframes. Each subframe comprises one or more resource blocks. Each resource block comprises S OFDM symbols. Each of the S OFDM symbols comprises N subcarriers, and each subcarrier of each OFDM symbol comprises a resource element. The base station further comprises a reference signal allocator configured to allocate a first group of the plurality of reference signals to selected resource elements of a first subframe according to a reference signal pattern. The first group of the plurality of reference signals is for a first group of antenna ports. The reference signal allocator also configured to allocate a second group of the plurality of reference signals to selected resource elements of a second subframe according to the same reference signal pattern. The second group of the plurality of reference signals is for a second group of antenna ports different from the first group of antenna ports.

主权项

1. A base station, comprising:
a downlink transmit path comprising circuitry configured to transmit at least one reference signal in one or more subframes, each subframe comprising two slots, each slot comprising S OFDM symbols, each of the S OFDM symbols comprising N resource elements; and a reference signal controller configured to:
apply one orthogonal code of two orthogonal codes to an antenna port of a first set of antenna ports, if the number of layers is less than or equal to a predetermined number of layers, andapply one orthogonal code of four orthogonal codes to an antenna port of a second set of antenna ports, if the number of layers is greater than the predetermined number of layers,wherein total number of antenna ports is based on the number of layers.