anyone plse help me to get the matlab code for ACO- OFDM

please send me the optical OFDM source code

i need the general matlab coding for aco and dco ofdm
pl can u send it to me

To get full information or details of matlab code for dco optical ofdm please have a look on the pages

http://studentbank.in/report-matlab-code...ode=linear


if you again feel trouble on matlab code for dco optical ofdm please reply in that page and ask specific fields in matlab code for dco optical ofdm

Can any one please help me to implement the matlab code to achieve the exact results of (( Comparison of ACO-OFDM, DCO-OFDM and ADO-OFDM in IM/DD Systems ))
farzane ebrahimi71[at]gmail.com

From DC-Biased to DC-Informative Optical OFDM

Abstract

We propose a novel modulation scheme for intensity modulation and direct detection (IM/DD)
based optical communication system employing orthogonal frequency division multiplexing (OFDM).
This method utilizes the DC-bias, which typically is discarded at the receiver-end, to carry information
to achieve higher power efficiency. By formulating and solving a convex optimization problem, a
constellation in high dimensional space is designed offline for the input of the transmitter-side inverse
fast Fourier transform (IFFT) block. We point out that one can choose partial or full DC power for
information transmission. Under the condition that the spectrum efficiency is fixed and attainable, this
method bears notable power gain over traditional DC-biased optical OFDM (DCO-OFDM).

INTRODUCTION

Optical communication using visible light, infrared, or ultraviolet are promising candidates to
provide high-speed indoor/outdoor wireless access on non-regulated frequency bands [1], [2].
Unlike the radio frequency communication (RFC) systems, the light intensity is controlled to
convey information in optical communications. The baseband signals are required to be positive
and real, which impose some constraints on applying existing radio-frequency modulation
schemes, such as the orthogonal frequency division multiplexing (OFDM). Among plenty of
schemes proposed for Optical OFDM (O-OFDM), the asymmetrically-clipped optical OFDM
(ACO-OFDM) and DC-biased optical OFDM (DCO-OFDM) proposed by J. Armstrong etc. are
the most popular [3]. However, the ACO-OFDM scheme suffers from reduced spectral efficiency
since only 1/4 of the subcarriers carry information, and the DCO-OFDM scheme suffers from
low power efficiency due to use of a large DC-bias to compensate for the negative peak.

CONCLUSION AND FUTURE WORKS

We have proposed a novel IFFT-based optical OFDM scheme which uses the DC-bias to carry
information. In a high dimensional space including the DC and multiple subcarriers, optimized
constellation is obtained through solving a convex optimization problem. Further, a BSA scheme
is adopted to further reduce the system BER. Non-negligible power gains are observed from
simulations. We believe that the idea of proposed DC-informative constellation design can be
adopted to other optical modulation schemes.

Abstract
We present a comparative study of Diversity-Combined Asymmetrically Clipped Optical OFDM (D-C ACO-OFDM) and DC-biased Optical OFDM (DCO-OFDM) techniques in 17Gbps intensity modulated and direct detected (IM/DD) fiber page link of passive optical network (PON). From simulation results obtained with realistic components parameters, we find that D-C ACO-OFDM offers an improved demodulation than DCO-OFDM. Using 4QAM format and split ratio of 1×32, D-C ACO-OFDM is showed to reach 45.3km distance which is almost the double distance transmission of DCO-OFDM with the same modulation order. We also show at BER of 10-3, that 20km transmission distance can be reached at 24Gbps 4QAM D-C ACO-OFDM data rate and then D-C ACO-OFDM is a suitable efficient cost-effective solution for GPON deployment with benefit of use of low-cost laser bandwidth in comparison with DCO-OFDM. At the same BER performance, in comparison with D-C ACO-OFDM at high bit rates transmission, DCO-OFDM promises to deliver higher throughput. The Bit Error Rate (BER) performance value is fixed to 10-3 (limit value when Forward Error Codes are used).