Title :
Optimal training for affine-precoded and cyclic-prefized block transmissions
Author :
Ghogho, Mounir ; Swami, Ananthram
Author_Institution :
Sch. of EEE, Leeds Univ.
Abstract :
In block-mode transmission, inserting a cyclic prefix (CP) between two consecutive blocks provides an efficient way of removing inter-block interference and simplifies equalization of frequency-selective channels at the receiver. Here, we address optimal training design for channel estimation in such systems. Our investigations focus on affine precoding schemes. Apart from the CP insertion, no redundancy is introduced in the precoding. In designing the precoder, least squares channel estimation is constrained to be decoupled from symbol detection, which results in orthogonal precoding schemes. If the precoding matrix is full-rank, data-rate (or bandwidth) has to be traded off to accommodate training. We propose full-rank orthogonal single-carrier (FROSC) precoding. Then, in order to improve bandwidth efficiency, we propose a rank deficient orthogonal single carrier (DROSC) precoding scheme. Symbol recovery is still possible thanks to the finite alphabet property of the data symbols. Finally, simulation results show that the bit error rate of the DROSC method can be quite close to that of the FROSC scheme. The former is however spectrally more efficient
Keywords :
channel coding; channel estimation; least squares approximations; matrix algebra; precoding; affine-precoded transmissions; channel estimation; cyclic prefix; cyclic-prefixed block transmissions; frequency-selective channels; full-rank orthogonal single-carrier precoding; inter-block interference; least squares channel estimation; precoding matrix; rank deficient orthogonal single carrier; receiver; symbol detection; Bandwidth; Channel estimation; Chirp modulation; Equalizers; Frequency; Interference; Laboratories; OFDM modulation; Redundancy; Transmitters;
Conference_Titel :
Statistical Signal Processing, 2005 IEEE/SP 13th Workshop on
Conference_Location :
Novosibirsk
Print_ISBN :
0-7803-9403-8
DOI :
10.1109/SSP.2005.1628807