High dynamic range low ripple RSSI for zero-IF or low-IF receivers

A technology of received signal strength and indicator, applied in transmission monitoring, electrical components, transmission systems, etc., and can solve problems such as complex signals

Inactive Publication Date: 2004-10-13
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Calculation of such a received vector magnitude approximation as an interm...

Method used

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  • High dynamic range low ripple RSSI for zero-IF or low-IF receivers
  • High dynamic range low ripple RSSI for zero-IF or low-IF receivers
  • High dynamic range low ripple RSSI for zero-IF or low-IF receivers

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Embodiment Construction

[0023] figure 1 A block diagram of a transceiver 1 is shown as a zero-IF or low-IF radio. Such a radio may be a time division duplex radio or any other suitable radio operating in the so-called 2.4 GHz ISM band according to the IEEE 802.11 standard. The transceiver 1 comprises a receiving branch RX and a transmitting branch T X . In another embodiment there is no transmission branch T X , the radio equipment is only a receiver. sending branch T X Includes a quadrature mixer with filters 2 and 3, mixers 4 and 5, and adder 6. Adder 6 is coupled to power amplifier 7 . The power amplifier 7 is coupled to R X / T X switch 8. R X / T X Switch 8 is coupled to antenna 9 . Orthogonal transmit signal T X -I and T X -Q is generated by a demodulator (not shown) and supplied to filters 2 and 3, respectively. receiving branch R X consists of a low noise radio frequency amplifier (LNA) 10 coupled to R X / T X switch. The LNA10 amplifies the radio frequency signal RF received ...

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Abstract

A received signal strength indicator operating at low intermediate of zero intermediate frequency is provided. The received signal strength indicator forms absolute values from an in-phase signal component and a quadrature signal component of a low or zero intermediate frequency signal that represents a received radio frequency signal. The absolute values are added. Logarithmic signal processing is performed either before absolute signal forming or after adding. Finally, low pass filtering is performed.

Description

technical field [0001] This invention relates to signal strength indicators for use in zero-IF or low-IF radio equipment such as receivers or transceivers. Such radio equipment receives radio frequency signals and also transmits signals when there is a transmitting part. Such radios may be cellular radios, cordless telephones, wireless local area network radios, satellite radios, or any other suitable radio. Background technique [0002] In US patent 5603112 a received signal strength indicator is disclosed. The received signal strength indicator is used to make signal strength measurements of radio frequency signals received in a radio frequency receiver. The received signal strength indicator includes an analog-to-digital converter for sampling a quadrature down-modulated signal at an intermediate frequency. The output signal of the analog-to-digital converter is provided to each comparator to compare the amplitude of the quadrature intermediate frequency signal. Depen...

Claims

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Application Information

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IPC IPC(8): H04B17/00
CPCH04B17/0057H04B17/318H04B1/26
Inventor R·莫欣德拉P·M·斯特雷特
Owner NXP BV
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