Pilot Frequency Selection for Wireless Signal Collision Mitigation
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to signal collisions, particularly in densely populated networks, leading to data corruption and reduced network reliability and efficiency.
Innovation Solution
The method involves obtaining a pilot staggering sequence for a pilot signal and shifting its order to mitigate collisions with other pilot signals, using a randomized starting sub-carrier frequency group or a pseudo-noise sequence generator seeded by network parameters to determine a unique starting pilot sub-carrier frequency group, thereby reducing pilot interference and enhancing reception quality and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless communication systems use fixed pilot frequency sequences, then network deployment is simplified, but signal collisions increase in densely populated networks
Solution Approach 1:
The patent implements dynamic pilot frequency selection by allowing wireless networks to randomly select starting pilot sub-carrier frequency groups from a predefined set. This dynamic approach replaces fixed sequences with variable, network-specific sequences that adapt to local conditions, reducing signal collisions in densely populated networks while maintaining deployment simplicity through automated selection.
Solution Approach 2:
The patent changes the parameter of pilot sub-carrier frequency group selection by introducing randomness and network-specific variations. Each network selects a unique starting frequency group from multiple available options, transforming the static parameter into a variable one that reduces interference without complicating the overall system architecture.
2Adaptability or versatility
If pilot signals use standardized frequency sequences, then interoperability is improved, but reception quality deteriorates due to pilot interference
Solution Approach 1:
The patent applies local quality by allowing each network to select pilot frequency sequences tailored to its specific deployment environment. While maintaining compatibility with standardized formats, each network can choose starting frequency groups that minimize local interference, thereby improving reception quality without sacrificing interoperability.
Solution Approach 2:
The patent introduces a standardized framework as an intermediary that defines the set of available pilot frequency sequences and selection rules. This intermediary structure enables networks to choose optimized sequences for their specific contexts while ensuring they remain compatible with the overall system standards, balancing interoperability and reception quality.
3Device complexity
If wireless networks use identical pilot staggering sequences, then system complexity is reduced, but network efficiency decreases due to signal collisions
Solution Approach 1:
The patent segments the pilot frequency spectrum by dividing it into multiple sub-carrier frequency groups. Each network is assigned or selects a specific starting group, creating segmented frequency resources that reduce collisions. This segmentation increases network efficiency while maintaining relatively simple system architecture through standardized segmentation rules.
Data Source
AI summary
The subject invention selects a starting sub-carrier frequency group for a pilot staggering sequence to facilitate in mitigating the possibility of pilot signal collisions. In one embodiment, a randomized starting sub-carrier frequency group of the pilot is utilized in a first orthogonal frequency division multiplexing (OFDM) symbol of a frame. In another embodiment, a starting pilot sub-carrier frequency group number is determined by utilizing a random number generator such as, for example, a Pseudo-Noise (PN) sequence generator, seeded by a network identification (ID) number. In this manner, the starting sub-carrier frequency group is specific to that particular network. The subject invention also provides a more scalable system through the trading of system bandwidth for coverage.