Patent ID: 8634385

Claim:
A method for transmitting first and second sets of Reference Signals (RSs) from a set of Node B antennas, the set of Node B antennas also transmitting control data signals in a Physical Downlink Control Channel (PDCCH) and information data signals in a Physical Downlink Shared Channel (PDSCH) over a transmission time interval having transmission symbols, the PDCCH being located in different transmission symbols than the PDSCH, the method comprising: transmitting the first set of RSs, from the set of Node B antennas, using frequency division multiplexing and time division multiplexing, in both PDCCH transmission symbols and PDSCH transmission symbols of consecutive transmission time intervals; and periodically transmitting the second set of RSs, from the set of Node B antennas, using code division multiplexing in a time domain and in a frequency domain, in PDSCH transmission symbols of the transmission time interval, wherein a transmission period is received from the Node B.