The fourth-generation (4G) and fifth-generation (5G) wireless communication systems use the orthogonal frequency division multiplexing (OFDM) modulation techniques subcarrier allocations. OFDM modulator demodulator have inverse fast Fourier transform (IFFT) (FFT) respectively. biggest challenge in IFFT/FFT processor is computation of imaginary real values. CORDIC has been proved one best rotati...

This review work based on the Performance analysis of OAM-OFDM system in AWGN Channel. In Digital communication system with multi carrier modulation technique can play very important role in all phase of designing and engineering. In this work we discuss about the performance analysis of 16QAM-OFDM system. We compare the performance analysis of different technique used in the 16 QAM OFDM and di...

Modern-day applications of fifth-generation (5G) and sixth-generation (6G) systems require fast, efficient, robust transmission multimedia information over wireless communication medium for both mobile fixed users. The hybrid amalgamation massive multiple input output (mMIMO) orthogonal frequency division multiplexing (OFDM) proves to be an impressive methodology fulfilling the needs 5G 6G In t...

A parallel and pipelined Fast Fourier Transform (FFT) processor for use in the Orthogonal Frequency division Multiplexer (OFDM) and WLAN, unlike being stored in the traditional ROM. The twiddle factors in our pipelined FFT processor can be accessed directly. A novel simple address mapping scheme and the modified radix 4 FFT also proposed. FPGA was majorly used to develop the ASIC IC’s to which ...

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique which is being used in many wireless systems including 4G. Binary input is mapped onto a constellation diagram, which represents bits in the form of complex numbers. Each mapped complex number is called a constellation symbol. All the constellation symbols are added together by means of inverse fast Fourier...

Orthogonal Frequency Division Multiplexing/Modulation (OFDM) is widely used for symbol level modulationdemodulation in communication systems for a high data rate low distance range applications. OFDM refers to both multiplexing and modulation technique to transmit parallel data using orthogonal carriers in the same or different frequency bands. In this work, DWT-OFDM is modeled which aims to se...

Orthogonal Frequency Division Multiplexing (OFDM) converts a dispersive channel into parallel subchannels and thus facilitates equalization. But when the channel has nulls close to or on the FFT grid, OFDM faces serious symbol recovery problems. As an alternative to various error-control coding techniques that have been proposed to ameliorate the problem, we linearly precode (LP) symbols before...

Abstract Intensity Modulated (IM) optical communication over an LED channel requires the use of a non-negative signal that can also cope with low-pass nature LEDs. For this purpose, dedicated schemes such as Flip-OFDM and Assymetrically Clipped Optical (ACO)-OFDM have been proposed. We derive common mathematical description on which both rely. Exploiting insight, we propose Continuous Phase (CP...

We introduce a computationally efficient FFT-based algorithm for the design of OFDM/ OQAM pulse shaping filters of arbitrary length and with arbitrary overlapping factors. The basic idea of our approach is to start from an arbitrary initial (nonorthogonal) filter and to perform an orthogonalization which yields an ISIand ICI-free pulse shaping filter. The orthogonalization is performed in the d...

This paper presents a software defined radio using Ofdm for high data rate transmission. to demonstrate the concepts of SDR we use a low power fixed-point digital signal processor. for reducing the complexity we use only two operational modes BPSK and QPSK .the adoptability nature using these two modes of OFDM system is discussed. Here we use a straight line method for getting fewer clock signa...