ELR PPDU Preamble Segmentation for Reliable Packet Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in extending coverage range while maintaining efficient packet detection and reducing complexity and power consumption, leading to increased latency and power consumption in enhanced long range (ELR) communications.
Innovation Solution
Implementing a PPDU design with a first portion including legacy training fields and a second portion with ELR mark fields modulated using QBPSK, along with a modulation scheme selected based on target data rate and duplication procedures, to enhance detection and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy preamble structure is used for ELR communications, then compatibility with existing devices is maintained, but detection reliability and range are insufficient
Solution Approach 1:
The preamble is segmented into two distinct portions: a first portion containing legacy training fields (L-STF, L-LTF, L-SIG, RL-SIG) for compatibility with existing devices, and a second portion containing ELR-specific fields (ELR-STF, ELR-LTF, ELR-SIG, ELR-mark) for enhanced long range detection. This segmentation allows the patent to maintain backward compatibility while introducing new ELR detection capabilities without requiring complete redesign of the preamble structure.
Solution Approach 2:
The ELR-mark field is placed at the beginning of the second preamble portion, performing preliminary identification of ELR packets before the receiver needs to decode the actual data. This preliminary marking action enables receivers to quickly identify ELR packets and adjust their detection parameters accordingly, improving detection reliability without requiring complex processing throughout the entire packet.
2Measurement precision
If QBPSK modulation is used for ELR mark fields, then detection accuracy is improved, but data rate is reduced
Solution Approach 1:
The transmission is segmented into two portions with different modulation requirements: the first preamble portion uses legacy modulation schemes optimized for compatibility and moderate data rates, while the second preamble portion uses QBPSK modulation specifically optimized for detection accuracy in ELR conditions. This segmentation allows each portion to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different modulation schemes are applied to different portions of the preamble based on their specific requirements. The ELR-mark fields use QBPSK modulation with higher detection accuracy, while the legacy fields use more efficient modulation schemes. This local optimization ensures that each portion receives the modulation treatment best suited to its function.
3Reliability
If enhanced long range preamble is transmitted, then reception reliability is improved, but latency increases
Solution Approach 1:
The ELR-mark field performs preliminary identification of ELR packets at the beginning of transmission, allowing receivers to prepare for ELR-specific processing in advance. This preliminary action enables more efficient packet processing and reduces the time required to accurately detect and decode ELR packets, thereby reducing latency despite the enhanced preamble structure.
Solution Approach 2:
The patent uses repeated signal structures (such as repeating the ELR-mark field or using signal sequences that can be detected through repetition) to enhance detection reliability. These repeated patterns allow receivers to quickly identify and lock onto ELR packets, reducing the time needed for initial packet detection and subsequent processing.
4Reliability
If duplication procedure is applied to ELR data, then decoding reliability is improved, but power consumption increases
Solution Approach 1:
The duplication procedure is applied selectively to the ELR data portion only after the receiver has identified the packet as ELR-type through the ELR-mark field. This preliminary identification allows the receiver to avoid processing duplicate legacy packets, thereby reducing unnecessary power consumption while maintaining high decoding reliability for ELR communications.
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 reduces latency and power consumption, improves reception reliability, and increases throughput and spectral efficiency by enabling quick packet detection and decoding in ELR communications.
Implementation Method 1
the first ELR mark field and the second ELR mark field both modulated according to a quadrature-binary phase-shift keying (QBPSK) modulation scheme
Data Source
AI summary
This disclosure provides methods, components, devices and systems for enhanced long range physical layer protocol data unit design and numerology. Some aspects more specifically relate to enhanced long range physical layer protocol data unit design and numerology. A first wireless device may transmit a first portion of a preamble of a PPDU and a second portion of a preamble including at least a first ELR mark field, a second ELR mark field, and an ELR modulated portion. The first ELR mark field and the second ELR mark field both may be modulated according to a quadrature-binary phase-shift keying modulation scheme. The first wireless device may modulate a portion of the PPDU, including at least an ELR signaling field and an ELR data field, according to a modulation scheme selected based on a target data rate and associated with a duplication procedure for the portion of the PPDU.