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US 12,316,440 B2Granted
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.
Claims88
A method for generating a waveform, the method comprising:
- generating, via one or more transmitters, a plurality of complex-valued baseband symbols, wherein:
- the plurality of complex-valued baseband symbols comprises at least one data symbol, at least one control information symbol and at least one reference signal (RS) symbol,
- the generating of the plurality of complex-valued baseband symbols comprises x/2 Binary Phase Shift Keying (BPSK) modulation,
- the generating of the plurality of complex-valued baseband symbols comprises converting from a time domain to a frequency domain using a Discrete Fourier Transform (DFT),
- the generating of the plurality of complex-valued baseband symbols comprises baseband filtering,
- the generating of the plurality of complex-valued baseband symbols comprises mapping using Orthogonal Frequency Division Multiplexing (OFDM),
- the mapping comprises a distributed subcarrier mapping of the at least one RS symbol,
- the distributed subcarrier mapping comprises occupied subcarriers and one or more null subcarriers,
- the mapping comprises a localized subcarrier mapping of the at least one data symbol and/or the at least one control information symbol, and
- the localized subcarrier mapping does not comprises a null subcarrier;
- and
- performing time multiplexing, via the one or more transmitters, of 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 the waveform.
9 more elements
A transmitter, the transmitter comprises:
- a modulator operable to add π/2 Binary Phase Shift Keying (BPSK) modulation to a plurality of complex-valued baseband symbols, wherein the plurality of complex-valued baseband symbols comprises at least one data symbol, at least one control information symbol and at least one reference signal (RS) symbol;
- a Discrete Fourier Transform (DFT) operable to convert the plurality of complex-valued baseband symbols from a time domain to a frequency domain;
- a baseband filter operable to spectrally shape the plurality of complex-valued baseband symbols;
- and
- a subcarrier mapper operable to map the plurality of complex-valued baseband symbols using Orthogonal Frequency Division Multiplexing (OFDM), wherein:
- the mapping comprises a distributed subcarrier mapping of the at least one RS symbol,
- the distributed subcarrier mapping comprises occupied subcarriers and one or more null subcarriers,
- the mapping comprises a localized subcarrier mapping of the at least one data symbol and/or the at least one control information symbol, and
- the localized subcarrier mapping does not comprises a null subcarrier;
- 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.
8 more elements
A method for processing a waveform, the method comprising:
- performing time de-multiplexing of an Orthogonal Frequency Division Multiplexing (OFDM) waveform, via one or more receivers, to generate a plurality of complex-valued baseband symbols comprising at least one data symbol, at least one control information symbol and at least one RS symbol;
- de-mapping the plurality of complex-valued baseband symbols, wherein:
- the at least one RS symbol is mapped according to a distributed subcarrier mapping,
- the distributed subcarrier mapping comprises occupied subcarriers and one or more null subcarriers,
- the at least one data symbol and/or the at least one control information symbol is mapped according to a localized subcarrier mapping, and
- the localized subcarrier mapping does not comprises a null subcarrier;
- converting the plurality of complex-valued baseband symbols from frequency domain symbols to time domain symbols using an Inverse Discrete Fourier Transform (IDFT);
- and
- performing π/2 Binary Phase Shift Keying (BPSK) demodulation of the time domain symbols.
6 more elements
A receiver, the receiver comprises:
- a de-multiplexor configured to time de-multiplex an Orthogonal Frequency Division Multiplexed (OFDM) waveform to generate a plurality of complex-valued baseband symbols comprising at least one data symbol, at least one control information symbol and at least one RS symbol;
- a de-mapper configured to de-map the plurality of complex-valued baseband symbols, wherein:
- the at least one RS symbol is mapped according to a distributed subcarrier mapping,
- the distributed subcarrier mapping comprises occupied subcarriers and one or more null subcarriers,
- the at least one data symbol and/or the at least one control information symbol is mapped according to a localized subcarrier mapping, and
- the localized subcarrier mapping does not comprises a null subcarrier;
- an Inverse Discrete Fourier Transformer (IDFT) configured to convert the plurality of complex-valued baseband symbols from frequency domain symbols to time domain symbols;
- and
- a demodulator configured to perform π/2 Binary Phase Shift Keying (BPSK) demodulation of the time domain symbols.
6 more elements
Dependencies are inferred from the claim text.