Wireless Packet Encoding Using Preamble Spreading Factors
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Solution Overview
Problem
In wireless communication environments, existing technologies face challenges in efficiently transmitting high-capacity multimedia content like HD and UHD due to data congestion, requiring adaptive coding schemes that balance error rates and data rates, while maintaining header size and transmission reliability.
Innovation Solution
A method and apparatus for determining a suitable coding scheme and spreading factor based on the wireless channel environment, configuring a packet preamble, and encoding the payload, with the transmitter and receiver sharing information on the coding scheme and spreading factor, and the receiver decoding the packet by detecting the spreading factor and estimating the coding scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coding scheme with high code rate is applied to transmit high capacity content, then data transmission rate is improved, but error rate increases due to wireless channel conditions
Solution Approach 1:
The patent applies dynamic adaptation by selecting different coding schemes and spreading factors based on real-time wireless channel conditions. The system transitions from static coding to dynamic selection, adjusting the code rate and spreading factor according to channel quality feedback, thereby optimizing both data transmission rate and error rate under varying channel conditions.
Solution Approach 2:
The patent changes key parameters (coding scheme, code rate, spreading factor) based on wireless channel environment assessment. By dynamically adjusting these parameters according to channel conditions, the system achieves optimal balance between high data transmission rate and low error rate, resolving the contradiction between productivity and reliability.
2Productivity
If adaptive coding schemes are used to optimize data transmission, then transmission efficiency is improved, but header size and system complexity increase
Solution Approach 1:
The patent makes the preamble sequence serve multiple functions: it acts as both a synchronization signal and a carrier of coding scheme information. By embedding spreading factor information in the preamble that both transmitter and receiver share, the system avoids adding separate header fields, thus maintaining transmission efficiency while minimizing header size increase.
Solution Approach 2:
The system uses the existing preamble structure to convey coding information without requiring additional header elements. The preamble itself serves the dual purpose of synchronization and coding indication, allowing the system to achieve adaptive coding efficiency without proportionally increasing header size.
3Measurement precision
If spreading factor is applied to preamble sequence, then coding scheme identification is improved, but processing complexity at receiver increases
Solution Approach 1:
The transmitter determines and applies the spreading factor to the preamble sequence in advance before transmission. The receiver, knowing the relationship between spreading factors and coding schemes (through pre-shared configuration), can directly identify the coding scheme by detecting the spreading factor in the received preamble, avoiding complex blind search and reducing processing complexity while maintaining detection accuracy.
Data Source
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AI summary
A method of a transmitter transmitting a packet encoded by applying a coding scheme based on a wireless channel environment to a receiver, and a method of the receiver detecting the coding scheme applied to the encoded packet and decoding the packet, in which the transmitter applies a spreading factor corresponding to the coding scheme to a preamble of the packet, and the receiver decodes the packet by detecting the coding scheme using the preamble.