Reference signal design for a system operating above 52.6 gigahertz (GHz) carrier frequency
For single carrier based waveform, Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) and single carrier with a frequency domain equalizer (SC-FDE) can be considered for both DL and UL. For OFDM based transmission scheme including DFT-s-OFDM, a cyclic prefix (CP) is inserted at the beginning of each block, where the last data symbols in a block is repeated as the CP. Typically, the length of CP exceeds the maximum expected delay spread in order to overcome the inter-symbol interference (ISI). For SC-FDE transmission scheme, a known sequence (guard interval (GI), unique word (UW), etc.) can be inserted at both the beginning and end of one block. Further, a linear equalizer in the frequency domain can be employed to reduce the receiver complexity. Compared to OFDM, SC-FDE transmission scheme can reduce Peak to Average Power Ratio (PAPR) and thus allow the use of less costly power amplifier.
1. A method for use in a wireless communication system operating above 52.6 gigahertz (GHz), the method comprising:
defining a plurality of Demodulation Reference Signal (DM-RS) antenna ports (APs);
generating a DM-RS sequence associated with a shared channel based on an energy per symbol ratio between a physical downlink shared channel (PDSCH) and a DMRS and based on a Zadoff-Chu sequence as a function of a block index of a block within one slot, wherein the DM-RS sequence is sub-block based in time, wherein the energy per symbol ratio corresponds to a number of comb offsets; and
transmitting the DM-RS sequence using one or more of the plurality of DM-RS APs.
2. The method of claim 1 , wherein the defining comprises:
allocating different DM-RS APs from among the plurality of DM-RS APs to different comb offsets from among the number of comb offsets.
3. The method of claim 1 , wherein the generating comprises:
generating the Zadoff-Chu sequence in a frequency domain or a time domain for a single carrier with a frequency domain equalizer (SC-FDE) based waveform.
4. The method of claim 1 , wherein the generating comprises:
generating the Zadoff-Chu sequence in a frequency domain or a time domain for a Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) based waveform.
5. The method of claim 1 , wherein the generating comprises:
employing different cyclic shift values for different DM-RS APs from among the plurality of DM-RS APs.
6. The method of claim 1 , wherein the generating comprises:
inserting a guard interval (GI) sequence before and after the DM-RS sequence.
7. The method of claim 1 , wherein the shared channel comprises:
a physical downlink shared channel (PDSCH); or
a physical uplink shared channel (PUSCH).
8. An apparatus for use in a wireless communication system, the apparatus comprising:
processor circuitry configured to:
define a plurality of Demodulation Reference Signal (DM-RS) antenna ports (APs), and
generate a DM-RS sequence associated with a shared channel as a function of a block index of a block within one slot based on an energy per symbol ratio between a physical downlink shared channel (PDSCH) and a DMRS and based on a Zadoff-Chu sequence generated in a frequency domain or a time domain for a single carrier with a frequency domain equalizer (SC-FDE) based waveform, wherein the DM-RS sequence is sub-block based in time, wherein the energy per symbol ratio corresponds to a number of comb offsets; and
radio front end circuitry configured to transmit the DM-RS sequence using one or more of the plurality of DM-RS APs.
9. The apparatus of claim 8 , wherein the processor circuitry is further configured to employ different cyclic shift values for different DM-RS APs from among the plurality of DM-RS APs.
10. The apparatus of claim 8 , wherein the processor circuitry is further configured to insert a guard interval (GI) sequence before and after the DM-RS sequence.
11. The apparatus of claim 8 , wherein the DM-RS sequence is above 52.6 gigahertz (GHz).
12. The apparatus of claim 8 , wherein the shared channel comprises:
a physical downlink shared channel (PDSCH); or
a physical uplink shared channel (PUSCH).
13. An apparatus for use in a wireless communication system, the apparatus comprising:
processor circuitry configured to:
define a plurality of Demodulation Reference Signal (DM-RS) antenna ports (APs), and
generate a DM-RS sequence associated with a shared channel as a function of a block index of a block within one slot based on an energy per symbol ratio between a physical downlink shared channel (PDSCH) and a DMRS and based on a Zadoff-Chu sequence generated in a frequency domain or a time domain for a Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) based waveform, wherein the DM-RS sequence is sub-block based in time, wherein the energy per symbol ratio corresponds to a number of comb offsets; and
radio front end circuitry configured to transmit the DM-RS sequence using the plurality of DM-RS APs.
14. The apparatus of claim 13 , wherein the processor circuitry is further configured to employ different cyclic shift values for different DM-RS APs from among the plurality of DM-RS APs.
15. The apparatus of claim 13 , wherein the processor circuitry is further configured to insert a guard interval (GI) sequence before and after the DM-RS sequence.
16. The apparatus of claim 13 , wherein the DM-RS sequence is above 52.6 gigahertz (GHz).
17. The apparatus of claim 13 , wherein the shared channel comprises:
a physical downlink shared channel (PDSCH); or
a physical uplink shared channel (PUSCH).
18. The method of claim 1 , wherein generating the DM-RS sequence further comprises:
applying cyclic shift hopping when generating the DM-RS based on a cyclic shift hopping pattern,
wherein the cyclic shift hopping pattern is a function of a symbol index, a block index, or a sub-block index.
19. The apparatus of claim 8 , wherein to generate the DM-RS sequence, the processor circuitry is further configured to:
apply cyclic shift hopping when generating the DM-RS based on a cyclic shift hopping pattern,
wherein the cyclic shift hopping pattern is a function of a symbol index, a block index, or a sub-block index.
20. The apparatus of claim 13 , wherein to generate the DM-RS sequence, the processor circuitry is further configured to:
apply cyclic shift hopping when generating the DM-RS based on a cyclic shift hopping pattern,
wherein the cyclic shift hopping pattern is a function of a symbol index, a block index, or a sub-block index.