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CN-122001728-A - Multiple-input multiple-output OFDM communication system and channel tracking control method

CN122001728ACN 122001728 ACN122001728 ACN 122001728ACN-122001728-A

Abstract

The channel tracking control method includes determining noise power according to a preamble of a packet during the preamble of the packet, wherein the preamble is transmitted through a plurality of subcarriers, determining a truncated standard value corresponding to a subcarrier among the plurality of subcarriers according to a noise attenuation factor of a channel detection circuit, determining a signal-to-noise ratio of the subcarrier according to the truncated standard value and the noise power, and controlling a channel tracking circuit to stop tracking a channel response of the subcarrier during a payload of the packet according to the signal-to-noise ratio and a target signal-to-noise ratio.

Inventors

  • ZENG JUNJIE

Assignees

  • 瑞昱半导体股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (10)

  1. 1. A channel tracking control method for a mimo ofdm communication system, the channel tracking control method comprising: Determining a noise power according to a preamble of a packet during the preamble of the packet, wherein the preamble is transmitted via a plurality of subcarriers; determining a truncated standard value corresponding to a subcarrier of the plurality of subcarriers according to a noise attenuation factor of a channel detection circuit during the preamble; determining a signal-to-noise ratio of the sub-carrier during the preamble based on the truncated standard value and the noise power, and A channel tracking circuit is controlled to stop tracking a channel response of the subcarrier during a payload of the packet based on the signal-to-noise ratio and a target signal-to-noise ratio.
  2. 2. The channel tracking control method according to claim 1, wherein the channel detection circuit comprises a coarse channel estimation circuit and a channel smoothing circuit, and the noise attenuation factor is a multiple of the noise on the preamble by the coarse channel estimation circuit and the channel smoothing circuit.
  3. 3. The channel tracking control method according to claim 1, wherein determining the signal-to-noise ratio during the preamble based on the truncated standard value and the noise power comprises: determining a value according to the noise power and the truncated standard value, and Dividing a signal power of the preamble by the value to determine the signal-to-noise ratio.
  4. 4. The channel tracking control method according to claim 1, wherein determining the signal-to-noise ratio during the preamble based on the truncated standard value and the noise power comprises: determining an expected signal-to-noise ratio based on the noise power and a signal power of the preamble, and And determining the signal-to-noise ratio according to the expected signal-to-noise ratio, the noise power and the cut-off standard value.
  5. 5. The channel tracking control method according to claim 1, wherein controlling the channel tracking circuit to stop tracking the channel response of the subcarrier during the payload according to the signal-to-noise ratio and the target signal-to-noise ratio comprises: controlling the channel tracking circuit to stop tracking the channel response during the payload when the signal-to-noise ratio is greater than the target signal-to-noise ratio, and The channel tracking circuit is controlled to track the channel response during the payload when the signal-to-noise ratio is not greater than the target signal-to-noise ratio.
  6. 6. The method of claim 1 wherein an initial tracking error exists between an estimated channel response generated by the channel detection circuit and an actual channel response of the subcarrier, and the truncated standard value is used to indicate a tail-end probability limit value of the initial tracking error.
  7. 7. The channel tracking control method according to claim 1, wherein determining the truncated standard value according to the noise attenuation factor of the channel detection circuit during the preamble comprises: A lookup table is searched according to the noise attenuation factor to determine the truncated standard value.
  8. 8. A multiple-input multiple-output orthogonal frequency division multiplexing communication system comprising: a noise power estimation circuit for determining a noise power according to a preamble of a packet during the preamble of the packet, wherein the preamble is transmitted via a plurality of sub-carriers; a channel detection circuit for providing a noise attenuation factor, and A control circuit for determining a truncated standard value of a subcarrier corresponding to the plurality of subcarriers during the preamble according to the noise attenuation factor, determining a signal-to-noise ratio of the subcarrier according to the truncated standard value and the noise power, and controlling a channel tracking circuit to stop tracking a channel response of the subcarrier during a payload period of the packet according to the signal-to-noise ratio and a target signal-to-noise ratio.
  9. 9. The mimo-ofdm communication system of claim 8, wherein the control circuit controls the channel tracking circuit to stop tracking the channel response during the payload period when the signal-to-noise ratio is greater than the target signal-to-noise ratio, and controls the channel tracking circuit to track the channel response during the payload period when the signal-to-noise ratio is not greater than the target signal-to-noise ratio.
  10. 10. The mimo-ofdm communication system of claim 8 wherein the channel detection circuit comprises a coarse channel estimation circuit and a channel smoothing circuit, and the noise attenuation factor is a multiple of the noise on the preamble by the coarse channel estimation circuit and the channel smoothing circuit.

Description

Multiple-input multiple-output OFDM communication system and channel tracking control method Technical Field The present invention relates to a mimo ofdm communication system, and more particularly, to a mimo ofdm communication system and a channel tracking control method thereof capable of avoiding power consumption by selectively enabling a channel tracking mechanism. Background In an orthogonal frequency division multiplexing communication system, each symbol (OFDM symbol) is transmitted simultaneously over a plurality of subcarriers. The channel tracking mechanism of conventional ofdm communication systems continuously tracks the channel response of the subcarriers during the payload (payload) of the packet to ensure that the receiver correctly decodes the data on the subcarriers. However, in a low mobility packet transmission (packet-based transmission) system, the Preamble (Preamble) is a message that fully reveals each subcarrier. Such an existing blind and continuous channel tracking mechanism would result in unnecessary power consumption. Disclosure of Invention In some embodiments, it is an object of the present invention to provide a mimo-ofdm communication system and a channel tracking control method thereof that can selectively enable a channel tracking mechanism to improve power saving by observing whether the signal-to-noise ratio of each subcarrier in a Preamble (Preamble) is sufficient, so as to improve the shortcomings of the prior art. In some aspects, a channel tracking control method includes determining a noise power based on a preamble of a packet during the preamble of the packet, wherein the preamble is transmitted over a plurality of subcarriers, determining a truncated standard value for a subcarrier corresponding to the plurality of subcarriers based on a noise attenuation factor of a channel detection circuit during the preamble, determining a signal-to-noise ratio for the subcarrier based on the truncated standard value and the noise power during the preamble, and controlling a channel tracking circuit to stop tracking a channel response of the subcarrier during a payload (payload) of the packet based on the signal-to-noise ratio and a target signal-to-noise ratio. In some aspects, a mimo ofdm communication system includes a noise power estimation circuit, a channel detection circuit, and a control circuit. The noise power estimation circuit is configured to determine a noise power according to a preamble of a packet during a preamble of the packet, wherein the preamble is transmitted over a plurality of subcarriers. The channel detection circuit is used for providing a noise attenuation factor. The control circuit is used for determining a cut-off standard value corresponding to one subcarrier in the plurality of subcarriers according to the noise attenuation factors during the preamble period, determining the signal-to-noise ratio of the subcarrier according to the cut-off standard value and the noise power, and controlling a channel tracking circuit to stop tracking the channel response of the subcarrier during the payload period of the packet according to the signal-to-noise ratio and a target signal-to-noise ratio. The features, implementation and functions of the present invention are described in detail below with reference to the preferred embodiments shown in the drawings. Drawings Fig. 1 is a diagram illustrating a mimo ofdm communication system in accordance with some embodiments of the present disclosure; FIG. 2 is a schematic diagram of the detection circuitry of FIG. 1 according to some embodiments of the present disclosure; FIG. 3 is a schematic diagram of a probability density function obtained by squaring the absolute value of a complex Gaussian distribution of initial tracking errors according to some embodiments of the present disclosure, and FIG. 4 is a flowchart illustrating a channel tracking control method according to some embodiments of the present disclosure, and FIG. 5 is a schematic diagram illustrating a channel tracking control mechanism according to some embodiments of the present disclosure. Detailed Description All terms used herein have their ordinary meaning. The foregoing words are defined in commonly used dictionaries, and the use of any word discussed herein is exemplary only and should not be interpreted as limiting the scope and meaning of the present disclosure. Similarly, the present disclosure is not limited to the various embodiments shown in this specification. As used herein, "coupled" or "connected" may mean that two or more elements are in direct physical or electrical contact with each other, or in indirect physical or electrical contact with each other, and may also mean that two or more elements are in operation or action with each other. As used herein, the term "circuitry" may be a particular system implemented by one or more circuits, and the term "circuit" may be a device connected by at least one transistor and/or at least