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EP-4738738-A1 - SYSTEMS AND METHODS FOR SIGNAL TO NOISE RATIO (SNR) AND NOISE VARIANCE ESTIMATION FROM ERROR VECTOR MAGNITUDE (EVM)

EP4738738A1EP 4738738 A1EP4738738 A1EP 4738738A1EP-4738738-A1

Abstract

An apparatus includes a receiver configured to receive data, and circuitry configured to receive one or more symbols based at least on the data, determine, using the one or more symbols, an error vector magnitude (EVM) value, identify a quadrature amplitude modulation (QAM) size, determine, using the EVM value and the QAM size, a signal-to-noise (SNR) value, and adjust, based at least on the SNR value, a transmission rate of a transmitter.

Inventors

  • PULIKKOONATTU, RETHNAKARAN

Assignees

  • Avago Technologies International Sales Pte. Limited

Dates

Publication Date
20260506
Application Date
20251104

Claims (15)

  1. An apparatus comprising: a receiver configured to receive data; and circuitry configured to: receive one or more symbols based at least on the data; determine, using the one or more symbols, an error vector magnitude, EVM, value; identify a quadrature amplitude modulation, QAM, size; determine, using the EVM value and the QAM size, a signal-to-noise, SNR, value; and adjust, based at least on the SNR value, a transmission rate of a transmitter.
  2. The apparatus of claim 1, wherein in determining the SNR value, the circuitry is configured to calculate the SNR value corresponding to the EVM value based at least on the QAM size.
  3. The apparatus of claim 1 or 2, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a look-up table, LUT.
  4. The apparatus of any one of the claims 1 to 3, wherein in determining the SNR value, the circuitry is configured to: identify a first EVM value and a second EVM value using an LUT; and calculate, using an interpolation, the SNR value within a range between the first EVM value and the second EVM value.
  5. The apparatus of any one of the claims 1 to 4, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a function of an SNR value and a QAM size.
  6. The apparatus of any one of the claims 1 to 5, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a nonlinear relationship between the SNR value and the QAM size.
  7. The apparatus of any one of the claims 1 to 6, wherein in identifying the QAM size, the circuitry is configured to identify the QAM size from a modulation and coding schemes, MCS, table.
  8. A method comprising: receiving, by a receiver, data; and receiving, by circuitry, one or more symbols based at least on the data; determining, by the circuitry using the one or more symbols, an error vector magnitude (EVM) value; identifying, by the circuitry, a quadrature amplitude modulation, QAM, size; determining, by the circuitry using the EVM value and the QAM size, a signal-to-noise (SNR) value; and adjusting, by the circuitry based at least on the SNR value, a transmission rate of a transmitter.
  9. The method of claim 8, comprising at least one of the following features: (A) determining the SNR value comprises calculating the SNR value corresponding to the EVM value based at least on the QAM size; (B) determining the SNR value comprises identifying the SNR value using a look-up table, LUT; (C) determining the SNR value comprises identifying a first EVM value and a second EVM value using an LUT; and calculating, using an interpolation, the SNR value within a range between the first EVM value and the second EVM value; (D) determining the SNR value comprises identifying the SNR value using a function of an SNR value and a QAM size; (E) determining the SNR value comprises identifying the SNR value using a nonlinear relationship between the SNR value and the QAM size; and (F) identifying the QAM size comprises identifying the QAM size from a modulation and coding schemes, MCS, table.
  10. An apparatus comprising: a transmitter; and circuitry configured to: receive one or more symbols based at least on data received by a receiver; determine, using the one or more symbols, an error vector magnitude (EVM) value; identify a quadrature amplitude modulation, QAM, size; determine, using the EVM value and the QAM size, a signal-to-noise, SNR, value; adjust, based at least on the SNR value, a transmission rate; and transmit, by the transmitter, data using the transmission rate.
  11. The apparatus of claim 10, wherein in determining the SNR value, the circuitry is configured to calculate the SNR value corresponding to the EVM value based at least on the QAM size.
  12. The apparatus of claim 10 or 11, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a look-up table, LUT.
  13. The apparatus of any one of the claims 10 to 12, wherein in determining the SNR value, the circuitry is configured to: identify a first EVM value and a second EVM value using an LUT; and calculate, using an interpolation, the SNR value within a range between the first EVM value and the second EVM value.
  14. The apparatus of any one of the claims 10 to 13, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a function of an SNR value and a QAM size.
  15. The apparatus of any one of the claims 10 to 14, wherein in determining the SNR value, the circuitry is configured to identify the SNR value using a nonlinear relationship between the SNR value and the QAM size.

Description

Field of the Disclosure This disclosure generally relates to systems and methods for signal to noise ratio (SNR) and noise variance estimation from error vector magnitude (EVM) by means of a fixed look up table mapping for quadrature amplitude modulation (QAM) modulated systems. Background The market for wireless communication devices has been growing due to increased use of portable devices, increased connectivity and data transfer between all manners of devices. Digital switching techniques have facilitated the large scale deployment of affordable, easy-to-use wireless communication networks. Wireless communication can operate in accordance with various standards, such as the IEEE 802.11x (e.g., Wi-Fi technology), Bluetooth, global system for mobile communications (GSM), code division multiple access (CDMA). Using such technologies, wireless communication devices can connect to local area networks and the internet without physical cables, communicating over radio frequencies and across various spaces and ranges. Brief Description of the Drawings Various objects, aspects, features, and advantages of the disclosure will become more apparent and better understood by referring to the detailed description taken in conjunction with the accompanying drawings, in which like reference characters identify corresponding elements throughout. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. FIG. 1A is a block diagram depicting a network environment, according to some embodiments;FIGS. 1B and 1C are block diagrams depicting computing devices useful in connection with the methods and systems described herein, according to some embodiments;FIG. 2 shows a block diagram of an example system, according to one or more embodiments;FIG. 3A illustrates an example plot showing non-linear relationships between SNR and EVM, according to one or more embodiments;FIG. 3B illustrates an example LUT, according to one or more embodiments;FIG. 4A illustrates an example plot showing non-linear relationships between SNR and EVM, according to one or more embodiments;FIG. 4B illustrates an example LUT, according to one or more embodiments;FIG. 5 illustrates an example plot showing a relationship between SNR and EVM, according to one or more embodiments;FIG. 6A illustrates an example of transmitted constellation, according to one or more embodiments;FIG. 6B illustrates an example of received constellation corresponding to the transmitted constellation of FIG. 6A, according to one or more embodiments;FIG. 7A illustrates an example of transmitted constellation, according to one or more embodiments;FIG. 7B illustrates an example of received constellation corresponding to the transmitted constellation of FIG. 7A, according to one or more embodiments;FIG. 8 is a flow diagram showing a process for SNR and noise variance estimation from EVM, in accordance with an embodiment. Detailed Description The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, a first feature in communication with or communicatively coupled to a second feature in the description that follows may include embodiments in which the first feature is in direct communication with or directly coupled to the second feature and may also include embodiments in which additional features may intervene between the first and second features, such that the first feature is in indirect communication with or indirectly coupled to the second feature. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. The following IEEE standard(s), including any draft versions of such standard(s), are hereby incorporated herein by reference in their entirety and are made part of the present disclosure for all purposes: WiFi Alliance standards and IEEE 802.11 standards including but not limited to IEEE 802.11a™, IEEE 802.11b™, IEEE 802.11g™, IEEE P802.11n™; IEEE P802.11ac™; and IEEE P802.11be™ through IEEE P802.11bn™ standards. Although this disclosure can reference aspects of these standard(s), the disclosure is in no way limited by these standard(s). For purposes of reading the description of the various embodiments below, the following descriptions of the sections of the specification and their respective contents can be helpful: Section A describes a network environment and computing environment which can be useful for practicing embodiments described herein; andSection B describes embodiments systems and methods for signal to nois