RF Transceiver Spreading Sequence Generation via Channel Power Levels
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Solution Overview
Problem
Current radio-frequency (RF) transceiver systems face challenges in creating matching spreading sequences independently without coordinating on the use of a particular spreading sequence, especially in dynamic environmental conditions, which affects data transmission reliability.
Innovation Solution
RF transceivers generate spreading sequences based on power level variations received from the RF channel, using methods such as concatenating power level values or applying them to error correction codes or pseudorandom number generators, to create orthogonal sequences that adapt to current channel characteristics, allowing for independent creation and use in frequency-hopping, direct-sequence, time-hopping, or orthogonal frequency division multiplexing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RF transceivers use predetermined spreading sequences, then system implementation is simplified, but adaptability to dynamic channel conditions deteriorates
Solution Approach 1:
The patent makes the spreading sequence dynamic by generating it from real-time power level measurements of the RF channel. Instead of using fixed predetermined sequences, the system continuously adapts the spreading sequence based on current channel characteristics, resolving the contradiction between implementation simplicity and adaptability.
Solution Approach 2:
The patent changes the parameters used to generate spreading sequences from fixed predetermined values to dynamically measured power levels. By using actual RF channel power level measurements as the basis for sequence generation, the system achieves both ease of implementation (using existing measurement capabilities) and adaptability (sequences automatically match current channel conditions).
2Loss of time
If RF transceivers independently create spreading sequences, then coordination overhead is reduced, but sequence matching reliability deteriorates
Solution Approach 1:
The patent enables each RF transceiver to independently generate its own spreading sequence by measuring power levels from the RF channel. Both transceivers perform the same measurement and generation process autonomously, eliminating the need for coordination while ensuring they create matching sequences through identical algorithms applied to the same channel characteristics.
Solution Approach 2:
The system uses feedback from real-time power level measurements of the RF channel to generate spreading sequences. Each transceiver measures the actual channel power levels and uses this feedback to create sequences that are guaranteed to match, as both are based on the same physical channel measurements rather than predetermined or randomly generated values.
Data Source
AI summary
A spreading sequence generator for a first radio frequency (RF) transceiver receives an RF signal from a second RF transceiver. The first RF transceiver measures power levels of the received RF signal at a plurality of instants to generate respective digital power level values and uses the plurality of digital power level values to create a first spreading sequence. The second RF transceiver receives an RF signal from the first RF transceiver and performs the same functions to create a second spreading sequence. Due to the reciprocal nature of the RF channel between the first and second RF transceivers, the first and second cryptographic keys match.