Receiver Preamble Detection Gain Control

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Solution Overview

Problem

Existing wireless communication systems face challenges in accurately detecting preambles due to interference and noise, leading to incorrect gain settings and frequency corrections, which can result in packet loss and reduced data throughput.

Innovation Solution

A method where the receiver performs concurrent gain and frequency adjustments before receiving a data packet, allowing for improved accuracy in locking onto the packet without extending the preamble sequence, and continues these adjustments throughout the packet reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the receiver performs automatic gain control during the preamble period, then the gain can be adjusted to match the received signal level, but interfering signals or noise may trigger the AGC prematurely, causing incorrect gain settings and preventing accurate preamble detection

Engineering Contradiction:

Improvepreamble detection accuracyVSAvoidgain control robustness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The receiver performs preliminary actions (gain control initialization and frequency offset correction) before the actual data packet reception begins. The gain controller is configured to complete gain control initialization before the data packet is received, using a predetermined period that starts before packet reception. This preliminary preparation ensures the receiver is properly calibrated before attempting to detect the preamble, preventing premature AGC triggering by interference.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reception process is divided into distinct segments: a predetermined preparation period before packet reception, the actual packet reception period, and ongoing processing during data reception. By segmenting the process and completing gain control initialization in the preparation period, the system separates the vulnerable preamble detection phase from the gain adjustment process, eliminating interference between these functions.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the preamble duration is extended to allow for both gain control and frequency offset correction, then more time is available for accurate detection, but the overall packet transmission time increases and data throughput decreases

Engineering Contradiction:

Improvedetection accuracyVSAvoiddata throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

Frequency offset correction is performed as a preliminary action during the packet reception period, concurrent with gain control initialization. By starting frequency offset correction before the preamble detection is complete and allowing it to run concurrently, the system eliminates the need to extend the preamble duration, maintaining high data throughput while ensuring accurate detection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The frequency offset correction process runs continuously during the packet reception period rather than being confined to a separate preliminary period. This continuous operation allows the correction to proceed in parallel with other reception activities, maximizing the utilization of the preamble period and avoiding transmission delays.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If the receiver listens for signals exceeding a threshold to trigger packet reception, then potential data packets can be detected, but noise or interference may also exceed the threshold, causing false triggering and incorrect gain settings

Engineering Contradiction:

Improvesignal detection capabilityVSAvoidfalse trigger resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The gain controller uses feedback from the received signal to continuously adjust the gain setting. During the predetermined period before packet reception, the controller monitors the signal and adjusts gain based on feedback, then maintains this setting during packet reception. This feedback mechanism allows the system to adapt to actual signal conditions while being guided by the known preamble structure, reducing false triggering.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary gain control initialization before packet reception based on pre-reception signal conditions, rather than reacting to threshold-exceeding events during reception. This preliminary setup establishes a baseline gain setting that is less susceptible to false triggering by transient interference during the critical detection period.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10674459B2Method of operating a receiver to process a preamble of a data packet, and to a receiver operating in accordance with the method

Publication Date: 2020.06.02 ANALOG DEVICES GLOBAL

AI summary

An improved receiver for use in a data pocket communications is provide, where the process of configuring the gain of the receiver and identifying a preamble in the data packet are made more robust. The improved receiver does not need to rely on the received power level exceeding a trigger threshold to initiate the gain control. Instead the gain control runs while the receiver is waiting for a data packet. The frequency correction process can run concurrently with the gain control process.