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.
Claims21
A method for generating a waveform in a communication network, the method comprising:
- performing spreading operation, by at least one transmitter, on an input data with a spread code to generate a spread data;
- rotating, by the at least one transmitter, the spread data to produce a rotated data;
- precoding, by the at least one transmitter, the rotated data using a precoding filter to produce a precoded data;
- transforming, by the at least one transmitter, the precoded data using Discrete Fourier Transform (DFT) to generate DFT output data;
- mapping, by the at least one transmitter, the DFT output data with subcarriers to generate a sub-carrier mapped DFT data;
- and
- generating, by the at least one transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation of the sub-carrier mapped DFT data, wherein the spread data is indicated by a first index and a second index, and wherein the first index indicates transmitter specific index and the second index indicates number of shifts;
- and
- circular shifting of the spread data which is indicated by the first index, wherein a number of times the circular shifting operating is performed is indicated by the second index.
A method for detecting a waveform in a communication network, the method comprising:
- transforming, by a receiver, an input data received from a transmitter using Discrete Fourier Transform (DFT) to obtain transformed data;
- de-mapping, by the receiver, the transformed data using sub carriers to generate a demapped transformed output data;
- filtering, by the receiver, the de-mapped transformed output data using estimated channel information to generate an OFDM symbol level output;
- processing, by the receiver, the OFDM symbol level output to remove a cover code and generate processed OFDM symbol data, wherein processing the OFDM symbol level output comprises removing of the orthogonal cover code (OCC) by multiplying the OFDM symbol level output with complex conjugate of the OCC used for the OFDM symbol;
- estimating, by the receiver, at least one of data and control information by demodulating the processed OFDM symbol data;
- summing over plurality of OFDM symbols with the OCC to obtain a decision variable;
- and
- determining one of BPSK and QPSK demodulation from the decision variable for estimating the user data and control information.
Dependencies are inferred from the claim text.