Orthogonal multiple access and non-orthogonal multiple access
A transmitter in a wireless communication network includes a bits-to-symbol mapper that produces a plurality of data symbols; and a waveform modulator that receives a first discrete-time waveform and at least a second discrete-time waveform that comprises a cyclic shift of the first discrete-time waveform; modulates a first one of the plurality of data symbols onto the first discrete-time waveform and modulates a second one of the plurality of second data symbol onto the second discrete-time waveform, to produce a plurality of modulated discrete-time waveforms; and sums the plurality of modulated discrete-time waveforms to produce a modulated discrete-time signal to be transmitted in the network. The first discrete-time waveform and at least the second discrete-time waveform are multicarrier signals.
1 . A method for uplink transmission in a wireless communication system, the method comprising:
receiving, at a User Equipment (UE), a transmission from a network node, the transmission comprising configuration information for frequency domain spectral shaping (FDSS), wherein the configuration information comprises one or more parameters indicative of spectral shaping characteristics;
generating Discrete Fourier Transform (DFT) spread data symbols from a plurality of data symbols;
applying a frequency domain window function to the DFT spread data symbols according to the one or more parameters, wherein applying the frequency domain window function modifies spectral characteristics of the DFT spread data symbols to produce modified DFT spread data symbols; and
employing an inverse fast Fourier transform (IFFT) to transmit the uplink transmission based on the modified DFT spread data symbols.
2 . The method of claim 1 , wherein the transmission comprising the configuration information is a physical downlink control channel (PDCCH).
3 . The method of claim 1 , wherein the configuration information is in a downlink control information (DCI) message.
4 . The method of claim 1 , wherein the configuration information indicates FDSS without spectrum extension.
5 . The method of claim 1 , wherein the configuration information indicates FDSS with spectrum extension with an amount of excess bandwidth, and generating DFT spread data symbols produces a number of DFT spread data symbols that is greater than the plurality of data symbols, the number of DFT spread data symbols based on the amount of excess bandwidth.
6 . The method of claim 1 , wherein the configuration information comprises at least one of a pulse shape, a roll-off factor, or a secondary pulse-shaping factor.
7 . The method of claim 1 , wherein the data symbols comprise reference signals.
8 . An apparatus for communication in a wireless communication system, the apparatus comprising:
control-channel processing circuitry in a User Equipment (UE) configured to receive a transmission from a network node, the transmission comprising configuration information for frequency domain spectral shaping (FDSS), wherein the configuration information comprises one or more parameters indicative of spectral shaping characteristics;
Discrete Fourier Transform (DFT) circuitry configured to transform a plurality of data symbols into DFT spread data symbols;
frequency-domain filter circuitry configured to apply a frequency domain window function to the DFT spread data symbols according to the one or more parameters, wherein the frequency domain window function modifies spectral characteristics of the DFT spread data symbols to produce modified DFT spread data symbols; and
transmission circuitry configured to transmit an uplink transmission based on the modified DFT spread data symbols.
9 . The apparatus of claim 8 , wherein the transmission comprising the configuration information is a physical downlink control channel (PDCCH).
10 . The apparatus of claim 8 , wherein the configuration information is in a downlink control information (DCI) message.
11 . The apparatus of claim 8 , wherein the configuration information indicates FDSS without spectrum extension.
12 . The apparatus of claim 8 , wherein the configuration information indicates FDSS with spectrum extension with an amount of excess bandwidth, and the DFT circuitry is configured to produce a number of DFT spread data symbols that is greater than the plurality of data symbols, the number of DFT spread data symbols based on the amount of excess bandwidth.
13 . The apparatus of claim 8 , wherein the configuration information comprises at least one of a pulse shape, a roll-off factor, or a secondary pulse-shaping factor.
14 . The apparatus of claim 8 , wherein the data symbols comprise reference signals.
15 . A User Equipment (UE) for communication in a wireless communication system, the apparatus comprising:
a control-signal processor configured to receive a transmission from a network node, the transmission comprising configuration information for frequency domain spectral shaping (FDSS), wherein the configuration information comprises one or more parameters indicative of spectral shaping characteristics;
a Discrete Fourier Transform (DFT) configured to transform a plurality of data symbols into DFT spread data symbols;
a pulse-shaping filter configured to apply a frequency domain window function to the DFT spread data symbols according to the one or more parameters, wherein the frequency domain window function modifies spectral characteristics of the DFT spread data symbols to produce modified DFT spread data symbols; and
an inverse DFT configured to generate an uplink discrete-time signal from the modified DFT spread data symbols.
16 . The apparatus of claim 15 , wherein the transmission comprising the configuration information is a physical downlink control channel (PDCCH).
17 . The apparatus of claim 15 , wherein the configuration information is in a downlink control information (DCI) message.
18 . The apparatus of claim 15 , wherein the configuration information indicates FDSS without spectrum extension.
19 . The apparatus of claim 15 , wherein the configuration information indicates FDSS with spectrum extension with an amount of excess bandwidth, and the DFT produces a number of DFT spread data symbols that is greater than the plurality of data symbols, the number of DFT spread data symbols based on the amount of excess bandwidth.
20 . The apparatus of claim 15 , wherein the configuration information comprises at least one of a pulse shape, a roll-off factor, or a secondary pulse-shaping factor.