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Cyclic Prefix based Enhanced Data Recovery in OFDM T. Y. Al-Naffouri1
 

Summary: Cyclic Prefix based Enhanced Data Recovery in OFDM
T. Y. Al-Naffouri1
and A. Quadeer2
Electrical Engineering Department, King Fahd University of Petroleum and Minerals, Saudi
Arabia, Email: {naffouri1
, aquadeer2
}@kfupm.edu.sa
Abstract
In this correspondence, we show how the cyclic prefix can be used to enhance the performance
of an OFDM receiver. Specifically, we show how an OFDM symbol can be blindly detected using
output symbol and associated cyclic prefix. The algorithm boils down to a nonlinear relationship
involving the input and output data only that can be searched for the maximum likelihood (ML)
estimate of the input.This relationship becomes much simpler in case of constant modulus (CM)
data. We also propose iterative methods to reduce the computational complexity involved in the ML
search of input for CM data.
I. Introduction
Orthogonal Frequency Division Multiplexing (OFDM) has emerged as a modulation scheme that
can achieve high data rate by efficiently handling multipath effects. The additional advantages
of simple implementation and high spectral efficiency due to orthogonality contribute towards the
increasing interest in OFDM. In order to achieve high data rates in OFDM, the receiver must

  

Source: Al-Naffouri, Tareq Y. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals
Quadeer, Ahmed Abdul - Electrical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering