Frequency multiplex transmitter and method for eliminating crosstalk

US7123591B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Ostertag · Ulm, DE
• Xihe Tuo · Duisburg, DE

Key dates

• Filing date: Mar 3, 1999
• Grant date: Oct 17, 2006
• Expiry date: Mar 3, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/123
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Crosstalk is eliminated in a transceiver which is operated in a frequency-division-multiplex full duplex mode. The technique is suitable in particular for what is referred to as software-defined telecommunications equipment. The frequency division multiplex transceiver has a baseband block, a transmit path and a receive path which respectively transmit and receive on different frequencies (full duplex mode). Furthermore, an auxiliary transmit path is provided which is connected to the receive path and which adds to the received signal a signal whose phase is shifted by 180° with respect to the phase of the crosstalk portion in the first receive path at the summation or superimposition point and which has the same frequency range as the transmit signal. The auxiliary transmit path is driven here, independently of the first transmit path, by the baseband block so as to minimize the crosstalk sensed by the baseband block.