OFCHM Wireless Multiplexing for Channel Efficiency
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Solution Overview
Problem
Conventional orthogonal resource division multiplexing methods lead to channel inefficiency due to unused intervals, especially in low-activity channels, and fail to adapt hopping patterns to varying communication environments, resulting in increased error possibilities from collisions among orthogonal codewords within OFDM-type subcarrier groups.
Innovation Solution
The method employs orthogonal frequency and code hopping multiplexing, allowing channels to hop between subcarrier groups and orthogonal codewords, reducing multi-path loss, and dynamically adjusting spreading and hopping factors based on channel conditions and user mobility to accommodate more channels and ensure quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If orthogonal resource division multiplexing is used to assign fixed subcarrier groups and orthogonal codewords to channels, then channel allocation is simple and deterministic, but channel efficiency deteriorates due to unused intervals in low-activity channels
Solution Approach 1:
The patent implements dynamic resource allocation where subcarrier groups and orthogonal codewords are not fixed but can be reassigned based on channel activity. The system allows channels to hop between different resource blocks adaptively, transforming the static resource division into a dynamic allocation mechanism that responds to varying channel conditions and activity levels, thereby improving channel efficiency without sacrificing allocation simplicity
Solution Approach 2:
The system changes the assignment parameters (subcarrier group indices and orthogonal codeword indices) dynamically based on channel conditions. By varying these parameters according to channel activity and interference conditions, the system optimizes resource utilization while maintaining deterministic allocation through defined hopping patterns and assignment rules
2Device complexity
If fixed hopping patterns are assigned to channels, then scheduling is simplified, but reliability deteriorates due to increased collision probabilities among orthogonal codewords within subcarrier groups
Solution Approach 1:
The patent employs dynamic hopping patterns that change over time and adapt to channel conditions. Instead of fixed patterns, the system uses pseudo-random hopping sequences that are updated based on interference detection and channel state, reducing collision probabilities while maintaining scheduling simplicity through structured randomization and defined update rules
Solution Approach 2:
The system implements feedback mechanisms where collision detection results and channel quality information are used to adjust hopping patterns dynamically. When collisions are detected or channel conditions change, the system modifies the hopping sequences to avoid problematic resource assignments, thereby improving reliability while keeping scheduling complexity manageable through rule-based adaptation
3Ease of operation
If spreading and hopping factors are kept constant, then system operation is simplified, but adaptability deteriorates in varying channel environments with different distances and relative velocities
Solution Approach 1:
The patent makes spreading factors and hopping patterns dynamic parameters that adapt to channel conditions. The system adjusts these factors based on detected channel characteristics such as distance, relative velocity, and interference levels, transforming a static configuration into a dynamic one that automatically optimizes performance across varying environments while maintaining operational simplicity through automated adaptation
Solution Approach 2:
The system changes key parameters (spreading factor, hopping rate, code length) based on channel conditions. By dynamically adjusting these parameters according to distance, velocity, and interference, the system achieves adaptability to diverse channel environments while keeping the underlying mechanism simple through predefined adjustment rules and threshold-based decision logic
Data Source
AI summary
An Orthogonal Frequency and Code Hopping Multiplexing (OFCHM) communication method based Orthogonal Frequency Division Multiplexing (OFDM) in a wireless communication system in which a plurality of communication channels are synchronized through a single medium. Six types of spreading and hopping methods are included, a method of controlling spreading and hopping depending on channel states, and a method of determining whether radio resources, consisting of subcarriers and orthogonal codewords, are allocated in a hopping manner according to the quality of service in the OFCHM communication method based OFDM. Furthermore, an embodiment employing six multiple array antennas is included. For this purpose, a method of combining a collision comparator and controller for monitoring the operations of a subcarrier group hopping pattern generator and an orthogonal code hopping pattern generator, a multiplexer and data symbol mapper, and the collision of hopping patterns that are composed of subcarriers and orthogonal codewords, and comparing data symbols to be transmitted to second communication stations to determine whether the data symbols collide in a symbol interval, a beam-forming processor for managing the operation of multiple array antennas, and a weighting vector controller is proposed.