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

一种收发信机、接收单元的技术，应用在发射机监控、接收器监控、传输监控等方向，能够解决系统复杂等问题，达到信号电平恒定、低动态范围、高准确性动态范围的效果

Inactive Publication Date: 2005-09-07
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system described is relatively complex and specifically requires two transceivers operable to communicate with each other

Method used

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

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Embodiment Construction

[0036] For clarity, the following description of the preferred embodiment of the invention focuses on the application of the HiperLAN2 transceiver, but it should be recognized that the invention is not limited to this application and can be used in a variety of transceivers that require or benefit from calibration. machine.

[0037] Fig. 1 is a diagram of a HiperLAN2 transceiver according to a preferred embodiment of the present invention.

[0038] The transmitter unit includes a digital part and an analog part. The digital part includes an Inverse Fast Fourier Transform (iFFT) 101 for modulating the data stream to be communicated to multiple sub-channels, as is known in OFDM transmitters. IFFT 101 is complex and produces an in-phase (I) signal and a quadrature (Q) signal. Each of the I and Q signals is converted to an analog signal in each of two digital-to-analog converters (DACs) 103 , 105 . The converted I and Q signals are low-pass filtered in Low Pass Filters (Low Pas...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B17/00
CPCH04B17/318H04B17/20H04B17/0067H04B17/0012H04B17/004H04B17/0057H04B17/24H04B17/14H04B1/40H04B1/10
Inventor 安东尼·牛顿海因茨·莱宁
Owner APPLE INC
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