Secret Communication TRIZ Cases
- Frequency Offset Estimation Using Multipath Signal Correlation
A frequency offset estimator correlates received signals with synchronization sequences to separate multipath components for precise measurement.
- Dynamic Data Scrambling for Link Synchronization and Power
A logic unit dynamically scrambles data portions to maintain synchronization reliability on communication links.
- OFDM Transmitter Windowing for Adjacent Channel Interference Suppression
Prolate spheroidal wave functions shape OFDM pulses to suppress adjacent channel interference while maintaining optimal frequency band utilization.
- Cyclic Delay Diversity for Wireless Signal Reliability
Time-shifted transmissions mitigate energy cancellation and improve channel estimation for legacy single-antenna receivers.
- Adaptive OFDM Channel Estimation Using Demodulated Data Feedback
An adaptive channel estimator updates subcarrier estimates using demodulated data symbols to refine signal detection.
- Finite Field Multiplication Masking for Secure Cryptography
A finite field multiplication method uses random value addition to maintain data masking during cryptographic processing.
- Virtual Cryptic Notes via Rotated Message Segments
A computer system generates virtual cryptic notes by arranging message portions in rotated orientations.
- Parallel Scrambler Diversity for Receiver Malfunction Prevention
Parallel scramblers select diverse outputs to prevent harmful patterns causing bit errors.
- Common and Dedicated Reference Symbols for Channel Estimation
Segmenting reference symbols into common and dedicated types improves channel estimation precision while reducing pilot overhead in multi-antenna transmissions.
- Asymmetric Filter Function for Adjacent Subband Interference
Asymmetric filter functions adapt roll-off factors based on adjacent subband occupancy, reducing peak-to-average power ratio and improving spectral efficiency.
- Transmitter-Side Equalizer for High-Speed Serial Link Reflection Cancellation
Transmitter-side equalization using floating tap finite impulse response filters reduces inter-symbol interference without increasing latency or die area.
- One-Way Broadcast Channel Hopping Synchronization
Pseudo-random channel hopping protocol maintains receiver synchronization without feedback loops.
- Tactical Radio Router for LOS and BLOS Switching
A tactical radio router directs encrypted data between line-of-sight and beyond-line-of-sight transceivers.
- UP-OFDMA Precoding for Constant Modulus Wireless Efficiency
Unitary precoding across OFDMA subcarriers maintains constant modulus transmissions for uplink wireless communications.
- Receiver Signal Detection via Frequency Domain Spectrum Analysis
A receiver transforms input signals from the time domain to the frequency domain to derive spectrum characteristics for signal detection.
- Split-MMSE Channel Estimation for OFDM Subcarriers
A Split-MMSE algorithm groups OFDM subcarriers into subgroups to perform secondary channel estimation using linear filter coefficients.
- Secured Digital Broadcasting Key Management via HSM
Regenerating secret keys in secured memory prevents key theft from decoder boxes, reducing logistical risks while maintaining stand-alone device operation.
- Low Complexity Sampling Recovery Method and Apparatus
Sampling rate conversion module estimates time domain impulse response to correct frequency offset at low sampling rates.
- Givens Rotation Quantization for MIMO Beamforming Feedback
Apply Givens rotation decomposition to quantize beamforming matrices, reducing feedback overhead while maintaining signal-to-noise ratio accuracy.
- Reducing PAPR in OFDM Systems via Complex Gradient Tone Reservation
Complex gradient scaling of reserved tone impulses reduces peak-to-average power ratio without sacrificing spectrum efficiency.
- Acoustic One-Time Password Authentication via Ultrasound
User devices transmit one-time passwords as ultrasound signals to authenticator hardware for seamless verification.
- One-way Key Fob Pairing Using Device IDs and ECC
Device identifiers enable secure one-way pairing via elliptical curve cryptography, eliminating secret key distribution vulnerabilities.
- Pilot Assisted Channel Estimation Using Interpolation Filters
Time and frequency interpolation filters estimate channel gain and phase at missing pilot indexes, resolving accuracy issues caused by varying pilot spacing.
- Keystream Encryption via Clock-Controlled Pseudo Random Number Generation
Clock-controlled pseudo random number generation resolves synchronization deviations and key leakage in word-level stream encryption.
- I/Q Imbalance Compensation in Wireless Transceivers
Frequency-domain least mean square algorithms update multiplier coefficients to neutralize I/Q imbalance interference and maintain signal orthogonality.
- Wireless Device Physical Layer Security Management
A wireless device verifies downlink signal authenticity using signature-based integrity protection mechanisms.
- Digital Feed Forward Noise Cancelling Regulator Circuit
A digital feed forward noise cancelling regulator circuit adapts output current based on detected data patterns to stabilize voltage.
- LPD Waveform Using PPM and Frequency Hopping
A low probability of detection waveform modulates in-phase and quadrature components using pulse-position modulation and randomized frequency hopping.
- NGN Card Call Service Authentication via Extraction
A call processing server obtains user card information to determine service eligibility and provide the card call service.
- SKEIN256 Instruction Set for 128-bit Processor Security
Specialized instruction set executes SKEIN256 MIX-PERMUTE operations using 128-bit registers, reducing cycle count while maintaining cryptographic security.
- Distance-Dependent Random Phase Modulation for Wireless Security
Transmitter applies random phase modulation to signals based on transmission delay.
- Parallel Precoder Circuit for DPSK Timing Margin
Segmenting the precoder into parallel units with offset phase adjustment resolves timing margin degradation caused by cascade logic depth.