On the use of TCH sequences for synchronization, channel and noise estimation

Author

Silva, João Carlos ; Souto, Nuno ; Dinis, Rui ; Montezuma, Paulo

Author_Institution

ISCTE, Lisbon, Portugal

fYear

2009

fDate

28-30 Sept. 2009

Firstpage

1

Lastpage

5

Abstract

TCH sequences have been studied for code-spreading and channel coding, but its true essence if that of synchronization and channel estimation. This is due to their property of being (almost) orthogonal to all sequences obtained via circular shifts. This property is extremely useful for time-offset synchronization (there is a distinct ldquopeakrdquo only when both sequences are aligned), and for dispersive channel-estimation (since the multipath-taps are now orthogonal to each other). Alongside the use of the TCH sequences, a sequence of equal symbols is also employed for frequency-synchronization-essential for correcting the phase offset between estimates (especially for high offset values), and thus allowing for the posterior signal-processing.

Keywords

channel coding; channel estimation; dispersive channels; noise; sequences; synchronisation; TCH sequence; channel coding; circular shift; dispersive channel-estimation; frequency synchronization; noise estimation; phase offset correction; posterior signal-processing; time-offset synchronization; AWGN; Autocorrelation; Channel coding; Channel estimation; Dispersion; Frequency estimation; Frequency synchronization; Telecommunications; Timing; Wireless LAN; Channel Estimation; Synchronization; TCH sequences;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing and Communication Systems, 2009. ICSPCS 2009. 3rd International Conference on

Conference_Location

Omaha, NE

Print_ISBN

978-1-4244-4473-1

Electronic_ISBN

978-1-4244-4474-8

Type

conf

DOI

10.1109/ICSPCS.2009.5306425

Filename

5306425