Optimal design and placement of pilot symbols for channel estimation

Authors:
Min Dong;Lang Tong
Affiliations:
Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY;-
Venue:
IEEE Transactions on Signal Processing
Year:
2002

Citing 0
Cited 9

Spectrally efficient communication over time-varying frequency-selective mobile channels: variable-size burst construction and adaptive modulation

EURASIP Journal on Applied Signal Processing
Optimum pilot-to-data power ratio for partial RAKE receiver in nakagami-m fading channels

IEEE Transactions on Wireless Communications
Pilot design for OFDM with null edge subcarriers

IEEE Transactions on Wireless Communications
Optimal and robust waveform design for MIMO radars in the presence of clutter

Signal Processing
Autocorrelation properties of OFDM timing synchronization waveforms employing pilot subcarriers

EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in wireless communications
Securing OFDM over wireless time-varying channels using subcarrier overloading with joint signal constellations

EURASIP Journal on Wireless Communications and Networking - Special issue on wireless physical layer security
On using transmission overhead efficiently for channel estimation in OFDM

IEEE Transactions on Communications
Packet design for communication under asynchronous interference

MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume II
Pilot Tones Optimization Using Artificial Bee Colony Algorithm for MIMO---OFDM Systems

Wireless Personal Communications: An International Journal

Quantified Score

Hi-index	35.68

Visualization

Abstract

The problem of designing and placing pilot symbols for the estimation of frequency-selective random channels is considered. The channel is assumed to be a block-fading model with finite impulse response (FIR). For both single-input single-output (SISO) and multiple-input multiple-output (MIMO) channels, under the assumption of independent and identical distributed channel taps, the Cramer-Rao bound (CRB) on the mean square error (MSE) of semi-blind channel estimators is derived and minimized with respect to pilot symbols and their placement. It is shown that the optimal strategy is to place pilot symbols satisfying certain orthogonality condition in such a way that data and pilot symbols with higher power are in the middle of the packet. The results also indicate that the optimal pilot placements are independent of channel probability distribution. For constant modulus symbols, we show that the quasi-periodic placement and its generalization in the multiuser case turn out to be optimal. We further consider estimating channels with correlated taps and show that the previous placement strategy is also optimal among orthogonal pilot sequences.