COMMON REFERENCE SIGNAL DESIGN BASED ON SEMI-UNIFORM PILOT SPACING AND ORTHOGONAL COVER CODE

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Systems and techniques are disclosed to reduce pilot overhead by providing common reference signals coded with cover codes that are orthogonal in time and frequency domains. Thereby, a disclosed method may comprise applying, by a processor of a wireless communications device, a first cover code to a first pilot sequence to produce a first set of pilot symbols comprising a pair of pilot symbols in a time domain, and a second cover code to a second pilot sequence to produce a second set of pilot symbols, wherein the first cover code and the second cover code are orthogonal to each other in time and frequency domains, delivering the pair of pilot symbols using a first number of resource elements to a first transmit port and the second set of pilot symbols using a second number of resource elements to a second transmit port, transmitting, from the first transmit port, the pair of pilot symbols within a first time interval of each other in the time domain, transmitting, from the second transmit port, the second set of pilot symbols, the first and second transmitted sets of pilot symbols comprising a common reference signal, and transmitting, from the first transmit port, a third set of pilot symbols within a second time interval of the pair of pilot symbols, the first time interval being less than the second time interval.