Methods and systems for generating a low peak-to-average power ratio (PAPR) data and reference signal
Embodiments of the present disclosure relate to systems and methods to generate a signal in a communication network. The method comprises filtering a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) data signal, and one of a DFT-S-OFDM and orthogonal frequency division multiplexing (OFDM) reference signal (RS) using a data filter and a RS filter respectively, to produce filtered data signal and filtered RS. The RS filter has one to one relationship with the data filter. Thereafter, port mapping the filtered RS to a corresponding port assigned to the transmitter to obtain port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of non-zero locations comprising of the filtered RS values and a second subset of zero locations comprising of zero values.
1. A method for generating a signal in a communication network, the method comprising:
within a user equipment (UE) device:
generating a filtered data signal by applying a discrete Fourier transform spreading (DFT-s), an orthogonal frequency division multiplexing (OFDM) and a data filter;
generating a filtered reference signal (RS) by applying a DFT-s, an OFDM and a RS filter, wherein the RS filter corresponds to the data filter; and
port mapping, the filtered RS to a corresponding port assigned to a transmitter to obtain port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of non-zero locations comprising the filtered RS values and a second subset of zero locations comprising one or more zero values.
2. The method of claim 1 , comprising:
generating the filtered RS by applying one of a Binary Phase Shift Keying (BPSK) modulation, a π/2 rotated BPSK modulation and a Zadoff-Chu (ZC) sequence modulation.
3. The method of claim 1 , comprising:
generating the filtered data signal by applying one of a Binary Phase Shift Keying (BPSK) modulation, a π/2 rotated BPSK modulation and a Zadoff-Chu (ZC) sequence modulation.
4. The method of claim 1 , comprising:
generating the filtered data signal by applying the data filter before the DFT-s.
5. The method of claim 1 , comprising:
generating the filtered data signal by applying the data filter after the DFT-s.
6. The method of claim 1 , comprising:
generating the filtered RS by applying the data filter before the DFT-s.
7. The method of claim 1 , comprising:
generating the filtered RS by applying the data filter after the DFT-s.
8. The method of claim 1 , wherein the RS filter is applied in a time domain and the data filter is applied in a frequency domain.
9. The method of claim 1 , wherein the data filter is applied in a time domain and the RS filter is applied in a frequency domain.
10. The method of claim 1 , comprising:
indicating characteristics of one or both of the RS filter and the data filter to a base station.
11. A system for generating a signal in a user equipment (UE) device, the system comprising:
at least one discrete Fourier transform (DFT) spreader;
at least one orthogonal frequency division (OFD) multiplexor;
a data filter, operably applied in conjunction with the at least one DFT spreader and the at least one OFD multiplexor, to generate a filtered data;
a reference signal (RS) filter, operably applied in conjunction with the at least one DFT spreader and the at least one OFD multiplexor, to generate a filtered RS; and
a transmitter to port map the filtered RS to an assigned port to obtain a port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of locations comprising the filtered RS values and a second subset of locations, each with a value of zero.
12. The system of claim 11 , comprising:
one of a Binary Phase Shift Keying (BPSK) modulator, a π/2 rotated BPSK modulator and a Zadoff-Chu (ZC) sequence modulator for use in generating the filtered RS.
13. The system of claim 11 , comprising:
one of a Binary Phase Shift Keying (BPSK) modulator, a π/2 rotated BPSK modulator and a Zadoff-Chu (ZC) sequence modulator for use in generating the filtered data signal.
14. The system of claim 11 , wherein:
the data filter is applied before the DFT spreader to generate the filtered data signal.
15. The system of claim 11 , wherein:
the data filter is applied after the DFT spreader to generate the filtered data signal.
16. The system of claim 11 , wherein:
the data filter is applied before the DFT spreader to generate the filtered RS.
17. The system of claim 11 , wherein:
the data filter is applied after the DFT spreader to generate the filtered RS.
18. The system of claim 11 , wherein the RS filter is applied in a time domain and the data filter is applied in a frequency domain.
19. The system of claim 11 , wherein the data filter is applied in a time domain and the RS filter is applied in a frequency domain.
20. The system of claim 11 , wherein the transmitter is operable to communicate characteristics of one or both of the RS filter and the data filter to a base station.