AGC Symbol Partial Use for V2X Data Recovery

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Solution Overview

Problem

In wireless communication networks, particularly in V2X systems, the automatic gain control (AGC) settling phase leads to corruption of time-domain IQ samples in the first SC-FDMA symbol, resulting in inefficiency and loss of valuable data due to the synchronous nature of 3GPP V2X, where the first symbol is often discarded during AGC calibration, wasting spectrum and time.

Innovation Solution

A method and apparatus that identify and discard only the corrupted pseudo time-domain samples during the AGC settling time, while recovering and repositioning valid samples within the same symbol, allowing for partial utilization of the first symbol and minimizing data loss by using a symbol controller to zero out the affected portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the first symbol is discarded during AGC calibration, then the AGC can properly settle, but valuable data is lost and spectral efficiency decreases

Engineering Contradiction:

ImproveAGC settling reliabilityVSAvoiddata loss in first symbol

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The first symbol is segmented into two parts: a first portion corresponding to the AGC settling time period and a second portion corresponding to the remaining valid data period. The symbol controller identifies and discards only the first portion (invalid samples) while preserving and processing the second portion (valid samples), thereby resolving the contradiction by selective removal rather than complete discarding.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The method discards only the invalid pseudo time-domain samples generated during AGC settling while recovering and repositioning valid samples from the same symbol. The symbol controller recovers valid samples by identifying their locations and repositioning them to maintain proper symbol structure, thus recovering valuable data that would otherwise be lost.

Inventive Principle:

Principle #34Discarding and recovering

2Reliability

If the entire first symbol is discarded, then AGC calibration is ensured, but time and spectrum resources are wasted

Engineering Contradiction:

ImproveAGC calibration reliabilityVSAvoidtime loss from symbol discarding

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of applying excessive action by discarding the entire first symbol, the method applies partial action by discarding only the specific portion corresponding to AGC settling time. The symbol controller calculates the exact duration of AGC settling and removes only that portion, preserving the rest of the symbol for data transmission, thereby minimizing time loss while ensuring AGC calibration reliability.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If invalid pseudo time-domain samples are not discarded, then data processing continues uninterrupted, but corrupted data is processed reducing accuracy

Engineering Contradiction:

Improvedata processing continuityVSAvoiddata decoding accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The symbol controller extracts and removes only the invalid pseudo time-domain samples from the data subframe while preserving valid samples. By taking out only the corrupted portions (samples generated during AGC settling) rather than removing the entire symbol, the method maintains data processing continuity while ensuring decoding accuracy is not compromised by corrupted data.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11082075B2Automatic gain control symbol partial use for decoding

Publication Date: 2021.08.03 NXP BV

AI summary

A method including receiving a data subframe having a plurality of symbols, determining a location of invalid pseudo time-domain samples in the data subframe, and discarding invalid pseudo time domain samples and recovering valid pseudo time domain samples to produce an updated data subframe, and processing the updated data subframe to produce demodulated data.