Patent · US Expired

Transmitting and receiving device for a multipoint-to-point network

US7154871B2 · kind B2 · utility

0Cited by

9References

6Claims

0Family size

Assignee

ALCATEL · FR

Inventors

Jurgen Otterbach · Stuttgart, DE
Hardy Halbauer · Stuttgart, DE
Gabriele Schwoerer · Weil der Stadt, DE
Peter Jaenecke · Neuenbürg, DE

Key dates

Filing date	Mar 19, 2001
Grant date	Dec 26, 2006
Priority date	—
Expiry date	Oct 26, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04B2201/709709
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A synchronization procedure for a multipoint-to-point CDMA network (2), which minimizes the influence on the information transmission. Instead of interleaving communications and synchronization signals timewise, a simultaneous emission is proposed, in which the synchronization signals are superimposed on the communications signals. The synchronization signals are coded with a special synchronization code (6), which does not correspond to the CDMA communications code of the information signals, e.g Barker code. In addition, the synchronization signals are sent at a lower amplitude compared with the communications signals. The synchronization signals are also modulated (7) prior to sending, in particular using alternating multiplication by +1 and −1. On the receiving side (3), the synchronization signals are detected by demodulation (12; 15), correlation (13; 16) and subsequent accumulation. The transmission capacity for the communications signals is maximized by this procedure and the influence of the synchronization signals on the communications signals minimized.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.