Systems and methods for phase noise tracking reference signal sequence generation using demodulation reference signals
A user equipment ( 910 ) is provided for use in a cellular network. The user equipment includes a transceiver ( 1010 ), a processor ( 1020 ), and a memory ( 1030 ). The user equipment ( 910 ) is configured to determine, for a data transmission, a mapping form a demodulation reference signal (DMRS) to a PNT-RS. A DMRS resulting signal is generated from a subset of DMRS for a first resource element in a subcarrier. The DMRS resulting signal is copied from the first resource element to a second resource element assigned to the PNT-RS in the subcarrier. The data transmission is transmitted using the DMRS resulting signal and the PNT-RS.
1. A method by a user equipment in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:
generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and
transmitting the data transmission, the DMRS and the PNT-RS to the network.
2. The method of claim 1 , wherein the first resource element is associated with a first OFDM symbol and the second resource element is associated with a second OFDM symbol.
3. The method according to claim 1 , wherein the DMRS is a complex value and wherein the complex value of the first resource element is used to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS.
4. The method of claim 1 , wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier.
5. The method of claim 1 , wherein the PNT-RS is generated by copying the DMRS.
6. A method by a wireless transmitter in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:
generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and
transmitting the data transmission, the DMRS and the PNT-RS to a wireless receiver.
7. A method by a network node in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the method comprising:
generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and
transmitting the data transmission, the DMRS and the PNT-RS to a user equipment.
8. A user equipment in a network for transmitting a phase noise tracking reference signal, PNT-RS, together with a data transmission, the user equipment comprising a transceiver, a memory, and a processor, the user equipment configured to:
generating a value for PNT-RS in a second resource element of a subcarrier using a demodulation reference signal, DMRS, sequence of a first resource element in the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing, OFDM, symbol, and wherein the first resource element is the resource element intersecting the subcarrier for the PNT-RS and the OFDM symbol for the DMRS; and
transmit the data transmission, the DMRS and the PNT-RS to the network.
9. The user equipment of claim 8 , wherein the first resource element is associated with a first OFDM symbol and the second resource element is associated with a second OFDM symbol.
10. The user equipment according to claim 8 , wherein the DMRS is a complex value and wherein the user equipment is configured to use the complex value of the first resource element to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS.
11. The user equipment of claim 8 , wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier.
12. The user equipment of claim 8 , wherein the user equipment is configured to generate the PNT-RS by copying the DMRS.