Multi-Frequency Code Systems TRIZ Cases
- OFDM Frame Synchronization via Pilot Phase Modulation
Phase-modulated pilot symbols replace guard intervals, enabling frame synchronization before the FFT operation and improving spectral efficiency.
- Localized Distributed Transmission Multiplexing for Wireless Overhead Reduction
Base station multiplexes localized and distributed transmissions to reduce overhead costs.
- OFDM Carrier Blocking for Adjacent Channel Interference
Blocking edge OFDM carriers reduces adjacent channel interference against legacy receivers, then unblocks them to restore bandwidth efficiency.
- Non-coherent Ambient Backscatter Using OFDM Cyclic Prefix
A non-coherent ambient backscatter device modulates data onto reflected OFDM signals using the cyclic prefix as a phase reference.
- Blind OFDM Preamble Detection via Autoconvolution
Autoconvolving OFDM sample streams detects preambles, reducing computational complexity while maintaining detection accuracy.
- Receiver Noise Estimation Using Unused Subcarriers
A receiver estimates thermal noise using pilot signals and idle subcarriers to improve channel accuracy.
- PAPR Reduction via RU Duplication Tone Repetition
Mask sequences split tones into sections with rotation values to reduce PAPR while maintaining coding rates in wireless communications.
- Quadrature Modulated Signal Generation Near DC Frequency
Digital interpolation moves the signal spectrum near direct current to reduce power consumption and minimize signal attenuation in short wired connections.