Wireless Receiver Bandwidth Detection Using Early Autocorrelation

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Solution Overview

Problem

Existing bandwidth pattern estimation methods in wireless communication require late computation and resource-intensive storage of symbols, leading to increased latency and resource requirements during packet decoding, particularly in IEEE 802.11be WiFi standard compliance.

Innovation Solution

An early bandwidth pattern estimation method using autocorrelation and correlation combining techniques to determine sub-bands where the signal is transmitted, allowing for refined bandwidth estimation before decoding the L-SIG field, reducing latency and resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If bandwidth pattern estimation is performed late in reception after receiving L-STF, L-LTF, and L-SIG, then measurement precision is improved, but loss of time increases

Engineering Contradiction:

Improvebandwidth pattern estimation accuracyVSAvoidpacket decoding latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs bandwidth pattern estimation during the reception of L-STF and L-LTF fields, before the L-SIG field is fully received. This preliminary action allows the receiver to determine the bandwidth pattern early in the packet reception process, enabling subsequent decoding operations to proceed in parallel without waiting for complete packet reception, thus reducing overall latency while maintaining sufficient estimation accuracy

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If symbols of L-SIG are stored until bandwidth pattern is estimated, then measurement precision is improved, but use of energy increases

Engineering Contradiction:

Improvebandwidth pattern estimation accuracyVSAvoidreceiver energy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent performs bandwidth pattern estimation during the reception of L-STF and L-LTF fields, before the L-SIG field is fully received. This preliminary action eliminates the need to store L-SIG symbols until estimation is complete, as the estimation is performed earlier using only the training fields. This reduces memory requirements and energy consumption associated with symbol storage and processing

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If bandwidth pattern estimation is performed early using autocorrelation, then loss of time is reduced, but measurement precision may deteriorate

Engineering Contradiction:

Improvebandwidth detection latencyVSAvoidbandwidth pattern estimation accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent performs bandwidth pattern estimation during the reception of L-STF and L-LTF fields using autocorrelation-based methods. This preliminary estimation provides sufficient accuracy for determining the bandwidth pattern, enabling early decoding operations. The use of autocorrelation on training fields with known structures provides reliable bandwidth detection without requiring complete packet reception

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses the L-STF and L-LTF training fields as intermediary signals for bandwidth pattern estimation. These training fields contain known sequences that enable reliable autocorrelation-based bandwidth detection. By using these intermediary training signals rather than waiting for the data portion of the packet, the system achieves early and accurate bandwidth estimation

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables efficient decoding of wireless signals with lower packet error rates and reduced resource consumption by providing an early estimate of bandwidth patterns, improving decoding performance in IEEE 802.11be standards.

Implementation Method 1

performing a first angle based autocorrelation when samples of a legacy short training field (L-STF) is received to determine first autocorrelations

Methodology Applied

Scientific EffectAutocorrelation:

Data Source

PatentUS12483457B2Method and apparatus for bandwidth detection in wireless networks

Publication Date: 2025.11.25 NXP USA INC

AI summary

A receiver receives a wireless signal comprising a plurality of fields including a legacy short training field (L-STF), legacy long training field (L-LTF), and legacy signal (L-SIG) field transmitted to a plurality of antenna of the receiver. For each sub-band in a receiver bandwidth and when samples of the L-STF is received, a first angle based autocorrelation is performed to determine a group of sub-bands which maximize a magnitude based on the first autocorrelations for one or more sub-bands. For each sub-band in the receiver bandwidth and when samples of the L-LTF is received, a second angle based autocorrelation is then performed to refine the crude bandwidth pattern estimate. One or more signal fields and one or more data fields of the received signal are decoded based on the refined bandwidth pattern estimate.