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IEEE TRANSACTIONS ON COMMUNICATIONS, ACCEPTED FOR PUBLICATION 1 On Optimum Pilot Design for Comb-Type OFDM Transmission over
 

Summary: IEEE TRANSACTIONS ON COMMUNICATIONS, ACCEPTED FOR PUBLICATION 1
On Optimum Pilot Design for Comb-Type OFDM Transmission over
Doubly-Selective Channels
K. M. Zahidul Islam, Student Member, IEEE, Tareq Y. Al-Naffouri, and Naofal Al-Dhahir, Fellow, IEEE
Abstract--We consider comb-type OFDM transmission over
doubly-selective channels. Given a fixed number and total power
of the pilot subcarriers, we show that the MMSE-optimum pilot
design consists of identical equally-spaced clusters where each
cluster is zero-correlation-zone sequence.
Index Terms--Pilot optimization, Doppler, ICI, OFDM, ZCZ
sequence.
I. INTRODUCTION
UNDER high mobility, the subcarriers of an orthogonal
frequency-division multiplexing (OFDM) symbol lose
their orthogonality resulting in performance-limiting Inter-
Carrier Interference (ICI). ICI makes channel estimation more
challenging since both the sub-carrier frequency responses
and the interference caused by each sub-carrier into other
subcarriers in each OFDM symbol have to be estimated.
Recently, we proposed in [1] a frequency-domain high-

  

Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas

 

Collections: Engineering