Method and System for Designing a Waveform for Data Communication

Abstract

Embodiments herein disclose a method and system for designing a waveform for data communication. The method includes applying, by a phase rotation applying unit, a constellation specific phase rotation between consecutive data symbols in a data stream to obtain a constellation rotated data stream. Further, the method includes introducing, by a frequency domain pulse shaping filter, an inter symbol interference (ISI) between modulated data symbols of the constellation rotated data stream, such that the ISI develops the waveform of the constellated rotated data stream to be transmitted.

What is claimed is: 
     
         1 - 24 . (canceled) 
     
     
         25 . 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 Discrete Fourier transform (DFT)-precoded-OFDM symbol, wherein the DFT-precoded-OFDM symbol generation comprises:
 a phase rotation between successive modulated data elements of a transmitter specific modulated data sequence, 
 a DFT operation, 
 a transmitter dependent subcarrier mapping, 
 a spectrum shaping filtering, 
 an inverse Fourier transform operation, and 
 adding at least one of a cyclic prefix and a cyclic suffix, 
 wherein said transmitter dependent subcarrier mapping comprises localized sub-carriers and/or distributed sub-carriers, and wherein said transmitter dependent subcarrier mapping is one of mutually fully overlapping, mutually partially overlapping and mutually non-overlapping. 
   
     
     
         26 . The method as claimed in  claim 25 , wherein the modulated data sequence is one of BPSK, QPSK and M-ary QAM. 
     
     
         27 . The method as claimed in  claim 26 , wherein the phase rotation is 90 degrees for the BPSK modulated data sequence. 
     
     
         28 . The method as claimed in  claim 26 , wherein the phase rotation is 180/M degrees for the M-ary QAM modulated data sequence, said M is size of the M-ary QAM. 
     
     
         29 . The method as claimed in  claim 25 , wherein the DFT operation is one of a one-sided DFT and a two-sided DFT. 
     
     
         30 . The method as claimed in  claim 25 , wherein the spectrum shaping filtering comprises coefficients that are a function of samples of a linearized Gaussian pulse. 
     
     
         31 . The method as claimed in  claims 30 , wherein the function comprises one of a one-sided DFT and a two-sided DFT. 
     
     
         32 . The method as claimed in  claim 25 , wherein the spectrum shaping filtering comprises coefficients that are a function of one of the three sequences [1], [0.707 0.707] and [0.2605 0.9268 0.2605]. 
     
     
         33 . The method as claimed in  claim 32 , wherein the function comprises one of a one-sided DFT and a two-sided DFT. 
     
     
         34 . The method as claimed in  claim 25 , wherein the one or more transmitters are associated with one or more users. 
     
     
         35 . The method as claimed in  claim 25 , wherein the one or more transmitters are associated with one or more antennas of a user. 
     
     
         36 . The method as claimed in  claim 25 , wherein the one or more transmitters are associated with one or more users and one or more antennas of the users. 
     
     
         37 . The method as claimed in  claim 25 , wherein the spectrum shaping filtering is associated with one of a user, a transmitter and antennas of a user. 
     
     
         38 . A method of receiving a signal which includes pilots and data, wherein said method comprises:
 estimating a channel impulse response using at least one of the pilots and coefficients of a spectrum shaping filter; and   equalizing a portion of the received signal according to the estimated channel impulse response.   
     
     
         39 . The method as claimed in  claim 38 , wherein the equalizing is one of a minimum mean square error (MMSE) and a Widely linear (WL)-MMSE. 
     
     
         40 . The method as claimed in  claim 38 , wherein the received signal is collected from one or more antennas, and wherein the equalizing is operable to obtain data of one or more users.