Transmitter and receiver gain calibration by means of feedback in a transceiver

Abstract

The invention relates to gain calibration in a transceiver unit (100) having a transmit unit and a receive unit and a feedback coupling (165) between them. The signal level measuring unit (163) measures the signal level of the feedback signal through the receiving unit or through the signal level detector (167). When connected through the signal level detector (167), the reference signal level of the feedback signal is set by adjusting the transmitting unit until a predetermined value is measured by the signal level measuring unit (163). Then calibrate the absolute value of the transmitter gain. The signal level measuring unit (163) is connected through the receiving unit, and the absolute value of the receiver gain is calibrated. Change the gain in the receiver or in the transmitter. The relative signal level change of the feedback signal is measured and used to calibrate the gain step size.

Description

technical field

[0001] The present invention relates to methods and devices for gain calibration and in particular for automatic calibration in transceiver units such as HiperLAN transceivers. Background technique

[0002] In recent years, there has been a growing focus on wireless communication between various communication and computing devices using Wireless Local Networks (WLAN). One such WLAN technology is High Performance Radio Local Area Network Type 2 (HiperLAN2), which has been standardized by the European Telecommunications Standards Institute (ETSI). HiperLAN2 is capable of communicating at very high data rates (up to 54Mbps) over short distances. HiperLAN2 operates in the 5GHz frequency range, uses Orthogonal Frequency Division Multiplex (OFDM) transmission technology, and supports different Quality of Service (QoS) for different connections. Therefore HiperLAN2 can support different services, including different data services, voice or video services. [0003...

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