Chaotic Spread Spectrum Bit Error Rate Reduction
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Solution Overview
Problem
Existing digital chaotic spread spectrum communications systems face challenges in minimizing bit error rates due to non-ideal signal transmission mediums, which distort and degrade signals, leading to nonlinear increases in bit errors based on signal power and noise ratios.
Innovation Solution
The system employs chaotic sequence spread spectrum communications by generating synchronized chaotic chips at both the transmitter and receiver, with each information symbol having a variable transmission duration based on a threshold symbol energy value, ensuring total chip energy meets or exceeds this threshold for reliable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant energy pulse shaping is used, then signal transmission is simplified, but bit error rate increases due to stationary signal energy being vulnerable to channel distortion and noise
Solution Approach 1:
The patent applies dynamics by transitioning from constant energy pulse shaping to variable energy pulse shaping. The signal energy is dynamically adjusted based on channel conditions and noise levels, allowing the system to adapt to varying transmission environments. This dynamic adjustment optimizes the bit error rate by ensuring sufficient signal energy reaches the receiver despite channel distortion, while avoiding excessive energy transmission that would waste power.
2Reliability
If non-constant energy pulse spreading sequences are used, then security and robustness to interferers improve, but computational power requirements increase significantly for synchronization
Solution Approach 1:
The patent applies parameter changes by modifying the energy parameter of the pulse spreading sequences. Instead of using conventional constant energy sequences or complex non-constant energy sequences requiring high computational synchronization, the invention uses variable energy sequences with controlled energy parameters. This approach maintains the security and robustness benefits of non-constant energy sequences while reducing the computational complexity for synchronization by carefully managing the energy variation patterns.
3Reliability
If transmission power margins are increased to reduce bit error rate, then communication reliability improves, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by implementing dynamic power control that adjusts transmission energy based on real-time channel conditions and receiver signal quality. Instead of using fixed high power margins for all transmissions, the system transmits with adaptive energy levels - using higher energy only when channel conditions deteriorate and lower energy when conditions are good. This dynamic approach maintains communication reliability while significantly reducing overall energy consumption compared to fixed high power transmission.
Data Source
AI summary
A system for chaotic sequence spread spectrum communications includes a transmitter (402) for transmitting information symbols using a chaotic sequence of chips generated at the transmitter, the information symbols having a duration of transmission based on a threshold symbol energy value and the chips. The system also includes a receiver (404) for extracting the information symbols from the transmitted signal using a chaotic sequence of chips generated at the receiver and the threshold symbol energy value. In the system, the chips generated at the transmitter and the receiver are identical and synchronized in time, where the duration of transmission of the information symbols in the carrier is a total duration of a selected number of the chips used for transmitting, and where the number of the chips is selected for the information symbols to provide a total chip energy greater than or equal to the threshold symbol energy value.