System and method for generating spreaded sequence with low peak-to-average power ratio (PAPR) waveform
AssigneeWisig Networks Private Limited
InventorKiran Kumar Kuchi
Life of this patent
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Abstract
Embodiments of the present disclosure relate to a method and system to generate a waveform in a communication network. The transmitter receives an input data and transmit a generated waveform to another communication system. The input data is spread with a spread code to generate a spread data and rotated using a constellation rotation operation to produce a rotated data. The rotated data is then precoded using precoding filter to produce a precoded data, and transformed into DFT output data using DFT operation. The DFT output data is then mapped with subcarriers to generate the sub-carrier mapped DFT data and modulated using Orthogonal Frequency Division Multiplexing (OFDM) modulation to generate the waveform with low PAPR.
Claims55
A method for generating a waveform by one or more transmitters with a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a communication network, the method comprising:
- generating, by the one or more transmitters, a plurality of Pi/2 Binary Phase Shift Keying (BPSK) Discrete Fourier Transform (DFT) spread OFDM (Pi/2 BPSK DFT-s-OFDM) symbols, wherein:
- the plurality of Pi/2 BPSK DFT-s-OFDM symbols comprises at least one of data, at least one control information symbol and at least one reference signal (RS) symbol,
- the generation of each of the plurality of Pi/2 BPSK DFT-s-OFDM symbols include a subcarrier mapping operation in at least one of a localized and a distributed manner,
- the at least one RS symbol, of the plurality of Pi/2 BPSK DFT-s-OFDM symbols, is associated with a distributed subcarrier mapping with occupied subcarriers and null subcarriers, and
- the at least one data symbol and/or the at least one control information symbol, of the plurality of Pi/2 BPSK DFT-s-OFDM symbols, is associated with a localized subcarrier mapping without null subcarriers;
- and
- performing time multiplexing, by the one or more transmitters, of the at least one data symbol, the at least one control information symbol and at least one RS symbol over a time period to generate the waveform.
A transmitter, wherein the transmitter comprises:
- a modulator operable to generate a plurality of Pi/2 Binary Phase Shift Keying (BPSK) Discrete Fourier Transform (DFT) spread OFDM (Pi/2 BPSK DFT-s-OFDM) symbols, wherein:
- the plurality of Pi/2 BPSK DFT-s-OFDM symbols comprises at least one data symbol, at least one control information symbol and at least one reference signal (RS) symbol,
- the at least one RS symbol, of the plurality of Pi/2 BPSK DFT-s-OFDM symbols, is associated with a distributed subcarrier mapping with occupied subcarriers and null subcarriers, and
- the at least one data symbol and/or the at least one control information symbol, of the plurality of Pi/2 BPSK DFT-s-OFDM symbols, is associated with a localized subcarrier mapping without null subcarriers;
- a subcarrier mapper;
- and
- a time multiplexor operable to multiplex the at least one data symbol, the at least one control information symbol and the at least one RS symbol over a time period to generate a waveform.
Dependencies are inferred from the claim text.