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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. XX, NO. XX, MONTH 2009 1 A Novel CDD-OFDM Scheme with Pilot-Aided Channel Estimation
 

Summary: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. XX, NO. XX, MONTH 2009 1
A Novel CDD-OFDM Scheme with Pilot-Aided Channel Estimation
Sili Lu, Student Member, IEEE and Naofal Al-Dhahir, Fellow, IEEE
Abstract--Cyclic delay diversity (CDD) is a low-complexity
standard-conformable transmit diversity scheme for coded or-
thogonal frequency division multiplexing (OFDM) systems. How-
ever, it makes channel estimation more challenging due to
the increased frequency-selectivity of the equivalent single-input
single-ouput channel. In this paper, we propose a novel CDD-
OFDM scheme with pilot-aided channel estimation for any
number of transmit antennas. By alternating and optimizing the
cyclic delay parameter over adjacent OFDM symbols, we design
a simple yet efficient channel estimation scheme and illustrate
its excellent performance for the DVB-T application.
Index Terms--OFDM, channel estimation, CDD, SISO, MISO.
I. INTRODUCTION
CDD is a low-complexity spatial transmit diversity scheme
where multiple antennas transmit cyclicly-shifted ver-
sions of the same signal. Essentially, CDD transforms a
multiple-input single-output (MISO) frequency-selective chan-

  

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

 

Collections: Engineering