Methods and systems for generating a low peak-to-average power ratio (PAPR) data and reference signal

A method for generating a waveform in a communication network, the method comprising:

• rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS;
• precoding, by the transmitter, the rotated modulated data and the rotated modulated RS using a data filter and a RS filter respectively, to produce a precoded data and precoded RS;
• transforming, by the transmitter, the precoded data and the precoded RS using Discrete Fourier Transform (DFT) to generate transformed precoded data and transformed precoded RS;
• port mapping, by the transmitter, the transformed precoded RS to a corresponding port of the transmitter to obtain port mapped transformed RS;
• mapping, by the transmitter, the port mapped transformed RS and the transformed precoded data using a plurality of subcarriers to generate a sub-carrier mapped output;
• and
• generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on the sub-carrier mapped output.

A method for generating a waveform in a communication network, the method comprising:

• rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS;
• transforming, by the transmitter, the rotated modulated data and the rotated modulated RS using Discrete Fourier Transform (DFT) to generate transformed rotated modulated data and transformed rotated modulated RS;
• filtering, by the transmitter, the transformed rotated modulated RS and the transformed rotated modulated data using a RS filter and data filter to produce a filtered RS and filtered data respectively;
• port mapping, by the transmitter, the filtered RS to corresponding ports of the transmitter to obtain port mapped RS output;
• mapping, by the transmitter, the port mapped RS output and filtered data using a plurality of subcarriers to generate a sub-carrier mapped output;
• and
• generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation of the sub-carrier mapped output.

A method for generating a waveform in a communication network, the method comprising:

• rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS;
• performing repetition operation, by the transmitter, on the rotated modulated RS to obtain a M-length rotated modulated RS;
• precoding, by the transmitter, the rotated modulated data and the M-length rotated modulated RS using a data filter and a RS filter respectively, to produce a precoded data and precoded RS;
• transforming, by the transmitter, the precoded data and the precoded RS using M-point Discrete Fourier Transform (DFT) to generate transformed data and transformed RS;
• performing circular rotation, by the transmitter, on the transformed RS by p samples that correspond to a specific port p out of the total ports P to obtain port mapped transformed output;
• mapping, by the transmitter, the port mapped transformed output using a plurality of subcarriers to generate a sub-carrier mapped output;
• and
• generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on the sub-carrier mapped output.

A method for generating a waveform in a communication network, the method comprising:

• rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS;
• performing repetition operation, by the transmitter, on the rotated modulated RS to obtain a M-length rotated modulated RS;
• transforming, by the transmitter, the rotated modulated data and the M-length rotated modulated RS using M-point Discrete Fourier Transform (DFT) to generate transformed data and transformed RS;
• filtering, by the transmitter, the transformed modulated data and the transformed modulated RS using a RS filter and a data filter respectively, to produce a precoded data and precoded RS, said data filter is having one to one correspondence with the RS filter;
• performing circular rotation, by the transmitter, on the filtered transformed RS by a port number p samples to obtain port mapped transformed output;
• mapping, by the transmitter, the port mapped transformed output and filtered data using a plurality of subcarriers to generate a sub-carrier mapped output;
• and
• generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on the sub-carrier mapped output.

A method for generating a waveform in a communication network, the method comprising:

• rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS;
• performing repetition operation, by the transmitter, on the rotated modulated RS to obtain a M-length rotated modulated RS;
• performing circular rotation, by the transmitter, on the M-length rotated modulated RS by multiplying with
• e
• j
• ⁢
• 2
• ⁢
• π
• ⁢
• p
• ⁢
• n
• M
• ,
• where p is the port number and n is the sample number to obtain port mapped modulated RS;
• transforming, by the transmitter, the rotated modulated data and the port mapped modulated RS using M-point Discrete Fourier Transform (DFT) to generate transformed data and transformed RS;
• filtering, by the transmitter, the transformed data and the transformed RS using a RS filter and a data filter respectively, to produce a filtered transformed data and filtered transformed RS;
• mapping, by the transmitter, the filtered transformed data and filtered transformed RS using a plurality of subcarriers to generate a sub-carrier mapped output;
• and
• generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on the sub-carrier mapped output.

A method for detecting received signal in a communication network, the method comprising:

• converting, by a receiver, the received signal into a digital signal, said received signal comprises at least one of data signal, reference signal (RS) and characteristics associated with a plurality of filters, said plurality of filters are data filter and RS filter;
• transforming, by the receiver, the digital signal in to a frequency domain signal using a Fast Fourier Transform (FFT);
• de-mapping, by the receiver, the transformed signal to one or more sub-carriers to obtain a de-mapped transformed signal;
• equalizing, by the receiver, the de-mapped transformed sequence using estimated channel to generate equalized data sequence, wherein the estimated channel is obtained using one of the characteristics associated with the RS filter if explicitly indicated, and using the data filter and the RS filter if explicitly indicated.