Patent · US Active

Method for generating I/Q signal in a TDMA transmitter and corresponding modulator

US7680210B2 · kind B2 · utility

11Cited by

5References

16Claims

0Family size

Assignee

ST-ERICSSON SA · CH

Inventors

Peter Bode · Unterhaching, DE
Harald Bauer · Ehningen, DE
Rainer Dietsch · Heroldsberg, DE

Key dates

Filing date	Aug 14, 2003
Grant date	Mar 16, 2010
Priority date	—
Expiry date	Aug 21, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/2017
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

The present invention relates to a digital I/Q modulator which efficiently supports multi-time-slot operation of wireless TDMA transmitters employing linear power amplifiers. According to the present invention, dips are introduced in the envelope of the I/Q signal in the guard interval between adjacent time-slots or bursts. The dips avoid interference on adjacent radio frequency channels when the gain of the TX chain in switched abruptly in order to change the power level of the TX signal or when the modulation scheme is changed. Also, a method is provided for generating the dips, which is particularly attractive if the modulation scheme in adjacent time-slots changes from GMSK to 8PSK or vice versa.

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