Orthogonal Frequency Division Multiplexing (OFDM) is a multi–channel modulation technique that makes use of Frequency division multiplexing (FDM) being modulated by a low bit rate digital stream. The main reason of using OFDM is because here the symbol detection is easy and also to increase the robustness against frequency selective fading and narrow band interference. Certain parameter like CF...

In this paper, we examine an orthogonal frequency division multiplexing (OFDM) system under imperfect channel conditions and pilot-insertion- based estimation. However, unlike conventional pilot-insertion-based estimation, some inserted pilot symbols are set to zero where the index of zero-pilot is employed transmit extra data bits. employ a minimum mean squared error (MMSE) detect transmitted ...

Abstract— Orthogonal frequency division multiplexing (OFDM) is an important technique to support high speed transmission of broadband traffic in wireless networks, especially broadband wireless local area networks (LANs). Based on OFDM, a new multiple access scheme, called OFDM-TDMA with subcarrier allocation (OFDMTDMA/SA), is introduced in this paper. It provides more flexibility in resource a...

Presently, digital signal process strategies are wide studied and varied DSP primarily based schemes are appointive for next-generation passive optical network (PON). A hybrid technique is projected which mixes time-division-multiplexing (TDM) design with advanced DSP strategies to attain high spectrum-efficiency colorless transmission. Orthogonal frequency division multiplexing (OFDM) with fre...