Pseudo-Random Hopping Pattern for Collision-Resistant Data Transceivers
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Solution Overview
Problem
Uncoordinated wireless communication systems in unlicensed frequency bands, such as the ISM band, face a high probability of collisions involving multiple consecutive sub-packets, leading to the loss of entire messages due to interference.
Innovation Solution
A data transceiver employs a pseudo-random hopping pattern with constraints to distribute time instants pseudo-randomly within defined time ranges, ensuring synchronization and minimizing collisions by fragmenting data into sub-packets transmitted non-concurrently, using error correction codes to compensate for single sub-packet collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping spread spectrum (FHSS) is used to improve security and reduce interference, then communication reliability is improved, but device complexity increases due to synchronization requirements between transmitter and receiver
Solution Approach 1:
The receiver autonomously acquires synchronization by detecting the preamble sequence and determining the hopping pattern independently, without requiring complex external synchronization signals or manual configuration. The receiver self-adjusts its frequency hopping sequence to match the transmitter by identifying the preamble in the received signal.
Solution Approach 2:
A preamble sequence is transmitted before the actual data to enable the receiver to perform synchronization and acquire the hopping pattern in advance. This preliminary action allows the receiver to prepare its frequency hopping sequence before data transmission begins, simplifying the overall system complexity while maintaining reliability.
2Productivity
If direct sequence spread spectrum (DSSS) is used to improve data transmission capability, then productivity is improved, but susceptibility to interference from repeating patterns increases
Solution Approach 1:
The patent combines FHSS and DSSS techniques into a unified communication system. The data signal undergoes both frequency hopping and direct sequence spreading, merging the interference resistance of FHSS with the high data transmission capability of DSSS to achieve both productivity improvement and interference protection.
Solution Approach 2:
The communication signal uses a composite spreading approach where the pseudorandom sequence combines both frequency hopping components and direct sequence spreading components. This composite signal structure provides both the high data rate of DSSS and the interference resistance of FHSS, protecting against repeating pattern interference.
Data Source
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AI summary
Embodiments provide a transceiver of a wireless communication network, wherein the transceiver is configured to transmit and/or receive data [e.g., a telegram] using a hopping pattern, the hopping pattern defining a sequence of time instants relative to a periodic time grid, wherein the transceiver is configured to determine [e.g., generate or calculate] the hopping pattern by determining, using a first determination function and a second determination function, time offsets between time instants of at least a block of time instants of the sequence of time instants and respective grid positions of the periodic time grid, wherein the first determination function specifies that time distances between immediately subsequent / consecutive time instants of the block of time instants are pseudo-randomly distributed between a predefined minimum time distance and a predefined maximum time distance, wherein the second determination function specifies that time offsets between the time instants of the block of time instants and the respective grid positions lie within respective time offset ranges around respective grid positions, the time offset ranges being defined by a time offset limiting function, each of the time offset ranges defining a maximum allowed offset of a respective time instant of the hopping pattern towards a respective grid position of the periodic grid, wherein, in case that a time instant determined as specified by the first determination function does not lie within the respective time offset range of the time distance limiting function as specified by the second determination function, then said time instant is mapped into [e.g., shifted to a most proximate edge or reflected into] the respective time offset range of the time offset limiting function as specified by the second determination function.