Receiver-side processing of orthogonal time frequency space modulated signals
First Claim
Patent Images
1. A wireless communication method, implemented by a wireless communication receiver, comprising:
- processing a wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples;
performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; and
inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal;
extracting symbol estimates from the DFE output signal; and
recovering the information bits from the symbol estimates;
wherein the processing the wireless signal includes applying a two-dimensional transform to generate the time-frequency domain digital samples;
wherein the applying the two-dimensional transform comprises a discrete Symplectic Fourier transform or applying a two-dimensional windowing function over a grid in the time-frequency domain.
3 Assignments
0 Petitions
Accused Products
Abstract
Wireless communication techniques for transmitting and receiving reference signals is described. The reference signals may include pilot signals that are transmitted using transmission resources that are separate from data transmission resources. Pilot signals are continuously transmitted from a base station to user equipment being served. Pilot signals are generated from delay-Doppler domain signals that are processed to obtain time-frequency signals that occupy a two-dimensional lattice in the time frequency domain that is non-overlapping with a lattice corresponding to data signal transmissions.
-
Citations
26 Claims
-
1. A wireless communication method, implemented by a wireless communication receiver, comprising:
-
processing a wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples; performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; and inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal; extracting symbol estimates from the DFE output signal; and recovering the information bits from the symbol estimates; wherein the processing the wireless signal includes applying a two-dimensional transform to generate the time-frequency domain digital samples; wherein the applying the two-dimensional transform comprises a discrete Symplectic Fourier transform or applying a two-dimensional windowing function over a grid in the time-frequency domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A wireless communication receiver apparatus, comprising:
-
a radio frequency (RF) front end; a memory storing instructions; a processor that reads the instructions from memory to receive a wireless signal from the RF front end and recover information bits from the wireless signal, the instructions comprising; instructions for processing a wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples; instructions for performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; and instructions for inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal; instructions for extracting symbol estimates from the DFE output signal; and instructions for recovering the information bits from the symbol estimates; wherein the instructions for processing the wireless signal include instructions for applying a two-dimensional transform to generate the time-frequency domain digital samples; wherein the applying the two-dimensional transform comprises applying a discrete Symplectic Fourier transform or applying a two-dimensional windowing function over a grid in the time-frequency domain. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A wireless communication receiver apparatus, comprising:
-
a radio frequency (RF) front end; a processor configured to cause the wireless communication apparatus to receive a wireless signal from the RF front end and recover information bits from the wireless signal by; processing the wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples; performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal; extracting symbol estimates from the DFE output signal; and recovering the information bits from the symbol estimates; wherein the processing the wireless signal include instructions for applying a two-dimensional transform to generate the time-frequency domain digital samples; wherein the applying the two-dimensional transform comprises applying a discrete Symplectic Fourier transform or applying a two-dimensional windowing function over a grid in the time-frequency domain. - View Dependent Claims (18, 19, 20, 21, 22)
-
-
23. A wireless communication receiver apparatus, comprising:
-
a radio frequency (RF) front end; a memory storing instructions; a processor that reads the instructions from memory to receive a wireless signal from the RF front end and recover information bits from the wireless signal, the instructions comprising; instructions for processing a wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples; instructions for performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; and instructions for inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal; instructions for extracting symbol estimates from the DFE output signal; and instructions for recovering the information bits from the symbol estimates; wherein the instructions for producing the DFE output signal include instructions for performing a single input multi-output (SIMO) decision feedback equalization (DFE) to produce the DFE output signal; wherein the SIMO-DFE is performed by operating a set of M parallel noise-predictive DFE feedback filters in the delay-time domain, where M is an integer. - View Dependent Claims (24)
-
-
25. A wireless communication method, implemented by a wireless communication receiver, comprising:
-
processing a wireless signal comprising information bits modulated using an orthogonal time frequency and space (OTFS) modulation scheme to generate time-frequency domain digital samples; performing linear equalization of the time-frequency domain digital samples resulting in an equalized signal; and inputting the equalized signal to a feedback filter operated in a delay-time domain to produce a decision feedback equalizer (DFE) output signal; extracting symbol estimates from the DFE output signal; and recovering the information bits from the symbol estimates; wherein the DFE is performed by operating a set of M parallel noise-predictive DFE feedback filters in the delay-time domain, where M is an integer. - View Dependent Claims (26)
-
Specification