Title :
A capacity comparison between time-multiplexed and superimposed pilots
Author :
Tapio, Mikael ; Bohlin, Patrik
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
In pilot-based communication systems, a known pilot (training) sequence is transmitted and used for estimation of the unknown channel. Without any strong motivation, recent publications suggest superimposing the pilot to the data instead of time-multiplexing it. In this paper an information theoretic approach is used to compare the communication performances of systems that employ time-multiplexed or superimposed pilots (SIP) for estimation of a frequency-selective blockwise-fading channel. By maximizing a parameterized expression on the mutual information of a SIP-based scheme, we investigate whether SIP-based systems have any gain in performance compared to conventional time-multiplexed systems.
Keywords :
channel estimation; fading channels; optimisation; time division multiplexing; SIP; channel estimation; frequency-selective blockwise-fading channel; information theoretic approach; maximization; pilot sequence; pilot-based communication system; superimposed pilot; Channel estimation; Communication systems; Data models; Frequency estimation; Intersymbol interference; Mutual information; Partial transmit sequences; Performance gain; Throughput; Wireless communication;
Conference_Titel :
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on
Print_ISBN :
0-7803-8622-1
DOI :
10.1109/ACSSC.2004.1399300
