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EP-4736515-A1 - SYSTEM AND METHOD FOR MONITORING VSWR IN RADIO SYSTEM

EP4736515A1EP 4736515 A1EP4736515 A1EP 4736515A1EP-4736515-A1

Abstract

The present disclosure provides a system and a method for monitoring Voltage Standing Wave Ratio (VSWR) in a radio system. The present disclosure monitors Radio Frequency (RF) chain performance and VSWR-related issues in a cost- effective manner. The present disclosure enables real-time monitoring of VSWR levels without a need of any external measurement device. The present disclosure continuously analyses the reflected power and impedance matching within the radio system. The present disclosure detects and identifies potential VSWR anomalies that may lead to signal degradation or equipment failure in advance. The present disclosure improves performance and reliability of the radio system. The present disclosure ensures optimal radio system performance in a cost-effective manner. The present disclosure reduces operating expenses or expenditure (OPEX) cost and failure turnaround time of operators.

Inventors

  • BHATNAGAR, PRADEEP KUMAR
  • GUPTA, DEEPAK
  • KHOSYA, NEKIRAM
  • Sahoo, Satyajit
  • BHATNAGAR, AAYUSH

Assignees

  • Jio Platforms Limited

Dates

Publication Date
20260506
Application Date
20240522

Claims (16)

  1. 1. A method for performing monitoring of voltage standing wave ratio (VSWR) in a radio system (200), the method comprising: capturing a feedback digital pre-distortion (DPD) power from a DPD application at an application specific integrated circuit (ASIC)/ a digital front end (DFE) (230); calculating a transmit power at an antenna port (214) by adding a transmit power factor and the DPD feedback power; reading a radio frequency (RF) power detector voltage output of a power detector circuitry (232) received via an on-board coupler (222) and a pi-PAD; converting the RF power detector voltage output into an ADC value by an analog to digital converter (ADC) (234); detecting whether the ADC value is valid; on detecting that the ADC value is valid, calculating power detected at the power detector circuitry (232), wherein on detecting that the ADC value is not valid, reading the radio frequency (RF) power detector voltage output at the power detector circuitry (232); calculating a reflected power at the antenna port (214) by adding a reflected power factor and the power detected at the power detector circuitry (232); calculating a return loss at the antenna port (214); detecting whether the return loss is equal to or less than zero; and on detecting that the return loss is equal to or less than zero, calculating a reflection coefficient and the VSWR.
  2. 2. The method claimed as in claim 1, wherein the return loss is difference between the transmitted power and the reflected power at the antenna port (214).
  3. 3. The method claimed as in claim 1, wherein the DPD application is configured to: characterize distortion by analyzing output of a power amplifier (PA) (206); and alter an input signal to the PA (206).
  4. 4. The method claimed as in claim 1, wherein on detecting that the return loss is not equal to or less than zero, the method comprising performing of monitoring of VSWR.
  5. 5. The method claimed as in claim 1, wherein the transmit power calculation factor is calculated for each of plurality of transmit chains based on difference between the DPD feedback power received at the ADC of the ASIC/DFE and the transmitted power received at the antenna port (214).
  6. 6. A system for performing monitoring of voltage standing wave ratio (VSWR) in a radio system comprising an application specific integrated circuit (ASIC)/ a digital front end (DFE) (230), a transceiver chain (228), a cavity filter (212), and a radio frequency (RF) antenna port (214); the ASIC/ DFE (230) having a digital pre-distortion (DPD) application configured to capture a DPD feedback power; the RF antenna port (214) configured to calculate a transmit power by adding a transmit power factor and the DPD feedback power; an analog to digital converter (ADC) (234) of the transceiver chain configured to read a radio frequency (RF) power detector voltage output received at a power detector circuitry (232) via an on-board coupler (222) and a pi-PAD; the ADC (234) of the transceiver chain configured to convert the RF power detector voltage output into an analog value; the ASIC/ DFE (230) configured to detect whether an ADC value is valid; on detecting that the ADC value is valid, the ASIC/ DFE (230) configured to calculate power detected at the power detector circuitry (232), wherein on detecting that the ADC value is not valid, the power detector circuitry (232) configured to read the radio frequency (RF) power detector voltage output; the ASIC/ DFE (230) configured to calculate a reflected power by adding a reflected power factor and the power detected at the power detector circuitry (232); the ASIC/ DFE (230) configured to calculate a return loss; the ASIC/ DFE (230) configured to detect whether the return loss is equal to or less than zero; and on detecting that the return loss is equal to or less than zero, the ASIC/ DFE (230) configured to calculate a reflection coefficient and the VSWR.
  7. 7. The system claimed as in claim 6, wherein the return loss is difference between the transmitted power and the reflected power at the antenna port.
  8. 8. The system claimed as in claim 6, wherein on detecting that the return loss is not equal to or less than zero, the system configured to perform monitoring of VSWR.
  9. 9. The system claimed as in claim 6, wherein the transmit power calculation factor is calculated for each of plurality of transmit chains based on difference between the DPD feedback power received at the ADC (220) of the ASIC/DFE (230) and the transmitted power received at the antenna port (214).
  10. 10. The system claimed as in claim 6, wherein the transceiver chain (228) comprises a transmission chain, a feedback chain, and a receiver chain, wherein the transmission chain comprises a first filter (202), a first digital step attenuator (DSA), a pre-driver, a power amplifier (206), a coupler (208) and a circulator (210); the feedback chain comprises a filter (216) and a first Pi-PAD and the receiver chain comprises a second PI-PAD, a single pole double throw (SPDT), a gain block, a second DSA, a second filter, a third SPDT, a low noise amplifier and the on-board coupler (222).
  11. 11. An apparatus for performing monitoring of voltage standing wave ratio (VSWR), the apparatus comprising an on-board coupler (222), a radio frequency (RF) power detector (232), and an analog-to-digital converter (ADC) (234); the on-board coupler (222) configured to receive power reflected at an antenna port; the RF power detector (232) configured to calculate received power via the on-board coupler; the RF power detector (232) configured to translate the calculated power into analog voltage; the ADC (234) configured to convert the analog voltage to digital voltage signal; and the ADC (234) configured to send the digital voltage signal to an application specific integrated circuit (ASIC)/ a digital front end (DFE) (230).
  12. 12. The apparatus claimed as in claim 11, wherein calculating a transmitted power at the antenna port (214) comprising: a signal analyser configured to measure a digital pre-distortion (DPD) feedback power; the signal analyser configured to calculate transmit power calculation factor for each of plurality of transmit chains based on difference between the DPD feedback power received at an ADC of the ASIC/DFE (230) and the transmitted power received at the antenna port (214); and the signal analyser configured to calculate the transmitted power at the antenna port (214) based on the DPD power and the transmit power calculation factor.
  13. 13. The apparatus claimed as in claim 11, wherein calculating a reflected power at the antenna port (214) comprising: the signal analyser configured to calculate reflected power calculation factor for each of plurality of receive chains based on insertion loss between the antenna port (214) to the RF power detector (232); and the signal analyser configured to calculate the reflected power at the antenna port (214) based on the received power at the RF power detector (232) and the reflected power calculation factor.
  14. 14. The apparatus claimed as in claim 11, wherein calculating a return loss at the antenna port comprising: the ASIC/ the DFE (230) configured to calculate the return loss at the antenna port (214) is difference between the reflected power and the transmitted power at the antenna port (214).
  15. 15. The apparatus claimed as in claim 11, wherein calculating VSWR comprising: the ASIC/ the DFE (230) configured to calculate a reflection coefficient based on the return loss at the antenna port (214); and the ASIC/ the DFE (230) configured to calculate VSWR based on the reflection coefficient.
  16. 16. A computer program product comprising a non-transitory computer- readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform a method for performing monitoring of voltage standing wave ratio (VSWR) in a radio system, the method comprising: capturing a feedback digital pre-distortion (DPD) power from a DPD application at an application specific integrated circuit (ASIC)/ a digital front end (DFE) (230); calculating a transmit power at an antenna port (214) by adding a transmit power factor and the DPD feedback power; reading a radio frequency (RF) power detector voltage output of a power detector circuitry (232) received via an on-board coupler (222) and a pi-PAD; converting the RF power detector voltage output into an ADC value by an analog to digital converter (ADC) (234); detecting whether the ADC value is valid; on detecting that the ADC value is valid, calculating power detected at the power detector circuitry (232), wherein on detecting that the ADC value is not valid, reading the radio frequency (RF) power detector voltage output at the power detector circuitry (232); calculating a reflected power at the antenna port (214) by adding a reflected power factor and the power detected at the power detector circuitry (232); calculating a return loss at the antenna port (214); detecting whether the return loss is equal to or less than zero; and on detecting that the return loss is equal to or less than zero, calculating a reflection coefficient and the VSWR.

Description

SYSTEM AND METHOD FOR MONITORING VSWR IN RADIO SYSTEM RESERVATION OF RIGHTS [001] A portion of the disclosure of this patent document contains material which is subject to intellectual property rights such as, but are not limited to, copyright, design, trademark, integrated circuit (IC) layout design, and/or trade dress protection, belonging to Jio Platforms Limited (JPL) or its affiliates (herein after referred as owner). The owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all rights whatsoever. All rights to such intellectual property are fully reserved by the owner. TECHNICAL FIELD [002] The present disclosure relates to a field of monitoring Radio Frequency (RF) chain performance and Voltage Standing Wave Ratio (VSWR)- related issues, and specifically to a system and a method for monitoring VSWR in a radio system. BACKGROUND [003] The following description of related art is intended to provide background information pertaining to the field of the disclosure. This section may include certain aspects of the art that may be related to various features of the present disclosure. However, it should be appreciated that this section be used only to enhance the understanding of the reader with respect to the present disclosure, and not as admissions of prior art. [004] In general, a typical Fifth-Generation (5G) New Radio (NR) system includes a transmit chain(s) with a link budget such that a particular output power is radiated as per region specific regulation norms. Higher transmit power than expected power may cause saturation of power amplifier leading to non-linearity, overall signal degradation and non-compliance with regional telecom regulatory laws. Similarly, low transmit power may lead to lower coverage and poor user experience. When no power is reflected at an antenna port, Voltage Standing Wave Ratio (VSWR) may be closed to its ideal value of one or reflection coefficient near to zero. Opened or loose port connections at the antenna or failure of components at output of a power amplifier may lead to poor VSWR. Thereby, leading to degradation of optimal radio system performance and increase in operational expenditure (OPEX) cost and failure turnaround time of the operators. [005] There is, therefore, a need in the art to improve state of enabling proactive monitoring and early detection of VSWR-related issues to ensure optimal radio system performance in a cost-effective manner by overcoming the deficiencies of the prior arts. SUMMARY [006] In an exemplary embodiment, a method for performing monitoring of voltage standing wave ratio (VSWR) in a radio system is described. The method comprises capturing a feedback digital pre-distortion (DPD) power from a DPD application at an application specific integrated circuit (ASIC)/ a digital front end (DFE). The method further comprises calculating a transmit power at an antenna port by adding a transmit power factor and the feedback DPD power. The method comprises reading a radio frequency (RF) power detector voltage output of a power detector circuitry received via an on-board coupler and a pi-PAD. The method further comprises converting the RF power detector voltage output into an ADC value by an analog to digital converter (ADC). The method comprises detecting whether the ADC value is valid. The method further comprises on detecting that the ADC value is valid, calculating power detected at the power detector circuitry. The method comprises on detecting that the ADC value is not valid, reading the radio frequency (RF) power detector voltage output at the power detector circuitry. The method comprises calculating a reflected power at the antenna port by adding a reflected power factor and the power detected at the power detector circuitry. The method comprises calculating a return loss at the antenna port and detecting whether the return loss is equal to or less than zero. The method comprises on detecting that the return loss is equal to or less than zero, calculating a reflection coefficient and the VSWR. [007] In some embodiment, the return loss is difference between the transmitted power and the reflected power at the antenna port. [008] In some embodiment, the DPD application is configured to characterize distortion by analyzing output of a power amplifier (PA) and alter an input signal to the PA. [009] In some embodiment, on detecting that the return loss is not equal to or less than zero, the method comprising performing of monitoring of VSWR. [0010] In some embodiment, the transmit power calculation factor is calculated for each of plurality of transmit chains based on difference between the DPD feedback power received at the ADC of the ASIC/DFE and the transmitted power received at the antenna port. [0011] In another exemplary embodiment, a system for performing monitoring of voltage st