METHOD FOR TRANSMITTING A REFERENCE SIGNAL, METHOD FOR DETERMINING PHASE NOISE AND RELATED APPARATUSES
First Claim
1. A method for transmitting a reference signal, comprising:
- pre-coding, by a transmitter, each data stream, and transmitting each data stream over its corresponding one or more antenna groups, wherein antenna elements or antenna ports in a same antenna group have a same phase noise, and all antenna groups corresponding to one data stream have a same phase noise;
pre-coding, by the transmitter, a Demodulation Reference Signal (DMRS) of each DMRS port, and transmitting each DMRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one DMRS port have a same phase noise, and one data stream corresponds to one DMRS port; and
pre-coding, by the transmitter, a Phase-Tracking Reference Signal (PTRS) of each PTRS port, and transmitting the PTRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one PTRS port have a same phase noise, and one PTRS port corresponds to at least one DMRS port.
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Accused Products
Abstract
The present invention relates to the field of wireless communications, and in particular, to a method for transmitting a reference signal, a method for determining a phase noise, and related apparatuses, to resolve the problem in the prior art that different phase noises of different antenna units or antenna ports of a transmitter cannot be accurately estimated and compensated for. The method comprises: the transmitter respectively transmitting each precoded DMRS and PTRS to a receiver via respective corresponding antenna groups having a same phase noise, and when the receiver receives the PTRS, performing channel estimation based on each received PTRS, to determine phase changes caused by phase noises corresponding to different antenna groups. In this way, even if different antennas of a transmitter have different phase noises, phase changes caused by the different phase noises can still be accurately determined, so that all data transmitted by the different antenna groups can be accurately demodulated according to different phase changes.
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Citations
35 Claims
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1. A method for transmitting a reference signal, comprising:
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pre-coding, by a transmitter, each data stream, and transmitting each data stream over its corresponding one or more antenna groups, wherein antenna elements or antenna ports in a same antenna group have a same phase noise, and all antenna groups corresponding to one data stream have a same phase noise; pre-coding, by the transmitter, a Demodulation Reference Signal (DMRS) of each DMRS port, and transmitting each DMRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one DMRS port have a same phase noise, and one data stream corresponds to one DMRS port; and pre-coding, by the transmitter, a Phase-Tracking Reference Signal (PTRS) of each PTRS port, and transmitting the PTRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one PTRS port have a same phase noise, and one PTRS port corresponds to at least one DMRS port. - View Dependent Claims (2, 3, 4, 6, 7, 9)
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5. (canceled)
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8. (canceled)
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10. (canceled)
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11. A method for determining phase noise, comprising:
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receiving, by a receiver, a Demodulation Reference Signals (DMRS) transmitted by a transmitter over one or more antenna groups corresponding to each DMRS port, performing first channel estimation respectively based upon each received DMRS, and obtaining a first channel estimation result corresponding to each DMRS; receiving, by the receiver, a Phase-Tracking Reference Signals (PTRS) transmitted by the transmitter respectively over one or more antenna groups corresponding to each PTRS port, performing second channel estimation respectively based upon each received PTRS, and obtaining a second channel estimation result corresponding to each PTRS; determining, by the receiver, a first mapping relationship, wherein the first mapping relationship represents a correspondence relationship between the respective PTRS, ports and the respective DMRS ports, one PTRS port corresponds to at least one DMRS port, and the PTRS port and its corresponding DMRS port use a same antenna, group for transmission; and calculating, by the receiver, a phase change, in a symbol comprising the PTRS, arising from a phase noise of the antenna groups corresponding to each PTRS port respectively using the second channel estimation result of each PTRS and the first channel estimation result of its corresponding DMRS based upon the first mapping relationship. - View Dependent Claims (12, 13)
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14-21. -21. (canceled)
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22. An apparatus for transmitting a reference signal, comprising:
- a processor, a transceiver, and a memory, wherein;
the processor is configured to read and execute program in the memory;
to transmit data streams, Demodulation Reference Signals (DMRSs), and Phase-Tracking Reference Signals (PTRSs) through the transceiver;
to pre-code each data stream, and then transmit each data stream over its corresponding one or more antenna groups, wherein antenna elements or antenna ports in a same antenna group have a same phase noise, and all antenna groups corresponding to one data stream have a same phase noise;
to pre-code a DMRS of each DMRS port, and transmit each DMRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one DMRS port have a same phase noise, and one data stream corresponds to one DMRS port; and
to pre-code a PTRS of each PTRS port, and transmit each PTRS over its corresponding one or more antenna groups, wherein all antenna groups corresponding to one PTRS port have a same phase noise, and one PTRS port corresponds to at least one PTRS port; andthe transceiver is configured to transmit and receive data under the control of the processor. - View Dependent Claims (23, 24, 25, 27, 28, 30)
- a processor, a transceiver, and a memory, wherein;
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26. (canceled)
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29. (canceled)
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31. (canceled)
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32. An apparatus for determining phase noise, comprising:
- a processor, a transceiver, a memory, and a user interface, wherein;
the processor is configured to read and execute program in the memory;
to receive data streams, Demodulation Reference Signals (DMRSs), and Phase-Tracking Reference Signals (PTRSs) through the transceiver;
to receive a DMRS transmitted by a transmitter over one or more antenna groups corresponding to each DMRS port, to perform first channel estimation respectively based upon each received DMRS, and to obtain a corresponding first channel estimation result corresponding to each DMRS;
to receive a PTRS transmitted by the transmitter respectively over one or more antenna groups corresponding to each PTRS port, to perform second channel estimation respectively based upon each received PTRS, and to obtain a corresponding second channel estimation result corresponding to each PTRS;
to determine a first mapping relationship, wherein the first mapping relationship represents a correspondence relationship between the respective PTRS ports and the respective DMRS ports, one PTRS port corresponds to at least one DMRS port, and the PTRS port and its corresponding DMRS port use a same antenna group for transmission; and
to calculate a phase change, in a symbol comprising the PTRS, arising from a phase noise of the antenna groups corresponding to each PTRS port respectively using the second channel estimation result of each PTRS and the first channel estimation result of its corresponding DMRS based upon the first mapping relationship; andthe transceiver is configured to transmit and receive data under the control of the processor. - View Dependent Claims (33, 34)
- a processor, a transceiver, a memory, and a user interface, wherein;
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35-37. -37. (canceled)
Specification