Multiple Carrier Systems TRIZ Cases
- Stepped Hierarchical Modulation Constellation Design
A stepped hierarchical modulation apparatus generates an asymmetric theta-QAM constellation to map information bits.
- IQ Imbalance Correction via Tunable Auxiliary Receiver
A tunable auxiliary receiver applies predistortion to reduce IQ imbalance and improve bit error rate in multi-band mobile transceivers.
- Data Block Processing Shuffling for Wireless Interference Reduction
Shuffles user data portions between resource units to spread interference, improving channel coding gain and speech capacity in mobile networks.
- Coded QAM Modulation Reducing Envelope Fluctuation
A coded modulation method maps bits to adjacent constellation points with minimized phase transitions.
- Poly-phased Time-interleaved RF-DAC for Spectral Purity
A poly-phased time-interleaved RF digital-to-analog converter system cancels nonlinearity errors through phase-offset waveform processing.
- OFDM Receiver Impulse Noise Mitigation via Symbol Quality Measures
Computes per-symbol quality measures to identify burst noise in OFDM carriers before decoding.
- Modulation Constellation Rotation for Fading Channel Reliability
Rotating modulation constellations separates I and Q components, reducing bit error rates in fading channels.
- Radar Phase Shifter Self-Diagnosis Using PLL Signal Reuse
Self-diagnosis unit generates monitor signals from existing local oscillation sources to evaluate phase shifters without adding dedicated PLL circuits.
- Digital Frontend System for Radio Transmitter Using CORDIC Conversion
A digital frontend system uses a pipeline CORDIC processor to convert quadrature signals into polar format.
- Transmitter Oscillator Calibration for Pulling Effect
Calibration circuitry generates signals to reduce pulling between adjacent oscillators, eliminating phase errors without increasing bandwidth requirements.
- Probabilistic Phase Error Carrier Recovery for Optical Symbols
A carrier recovery algorithm calculates probabilistic phase errors to rotate data symbols.
- Non-Uniform Constellation Modulation for Phase Noise Resilience
An optimized non-uniform constellation reduces bit error rates and SNR requirements under phase noise conditions.