This document describes a pre-coded generalized frequency division multiplexing system that exploits special properties of modulation matrices to perform block inverse discrete Fourier transform pre-coding. This pre-coding helps combat wireless channels and significantly reduces peak-to-average power ratio. The pre-coding schemes of block inverse discrete Fourier transform and discrete Fourier transform are found to outperform conventional GFDM receivers while having similar complexity to zero forcing receivers. Potential end users of this system include 5G applications, machine type communication, applications requiring very low latency, and cognitive radio.

1. A Pre-coded Generalized Frequency Division Multiplexing System
0453/KOL/2015 dated April 24, 2015
Novel / Special Features
• Special properties of modulation
matrices are exploited to get Block
IDFT pre-coding
• Pre-coding helps in combating
wireless channel
• Pre-coding reduces Peak power
to average power ratio
significantly
Abstract of invention
The present invention relates to Generalized Frequency
Division Multiplexing (GFDM). In particular, the present
invention is directed to develop a pre-coded generalized
frequency division multiplexing system based on properties of
modulation matrix of three advanced pre-coding schemes
namely Block Inverse Discrete Fourier Transform (BIDFT),
Discrete Fourier Transform (DFT) and Singular Value
Decomposition (SVD). Block inverse discrete Fourier transform
(BIDFT) and discrete Fourier transform (DFT)-based pre-coding
schemes are found to outperform conventional GFDM receiver
due to frequency diversity gain while having complexity similar
to zero forcing receiver of GFDM. Both BIDFT- and DFT-based
pre-coding schemes reduce peak-to-average power ratio
significantly.
Suvra Sekhar Das
Assistant Professor
GSSST, IIT Kharagpur
Shashank Tiwari
Doctoral Student
GSSST, IIT Kharagpur
QAM
Modu
lated
Data
Possible End Users
• 5G Applications
• Machine Type
Communication
• Very low latency
Applications
• Cognitive Radio