Patent ID: 9258161
Filing Date: 2016-02-09
CPC Classification: H04L

Claim Text:
1. A transmitter comprising: a reference symbol generator configured, as part of a phase division multiplexing technique, to apply first phase shifts to reference symbols of a first reference signal to produce first phase shifted reference symbols and to apply second phase shifts to the reference symbols of the first reference signal to produce second phase shifted reference symbols; a first reference symbol inserter configured to insert the first phase shifted reference symbols into a first stream of information symbols for transmission by a first antenna over a frequency and a plurality of symbol time periods; and a second reference symbol inserter configured to insert the second phase shifted reference symbols into a second stream of information symbols for transmission by a second antenna over the frequency and the plurality of symbol time periods, wherein the first antenna and the second antenna are grouped into a first cluster as part of the phase division multiplexing technique, and wherein the first and second phase shifted reference symbols are time, frequency, and code division multiplexed with third and fourth phase shifted reference symbols respectively transmitted by third and fourth antennas of the transmitter grouped into a second cluster as part of the phase division multiplexing technique.