| 摘要 |
A device and system communicates data and includes a modulation and mappi ng circuit that modulates and maps data symbols into a plurality of multiple subcarrier frequencies that are orthogonal to each other to form an Orthogo nal Frequency Division Multiplexed (OFDM) communications signal based on a f ixed or variable OFDM symbol rate. A pseudo-random signal generator is opera tive with the modulation and mapping circuit and generates pseudo-random sig nals to the modulation and mapping circuit based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate to lower any pr obability of interception and detection, reduce power per frequency (dB/Hz/s ec), and lower any required transmission power while maintaining an instanta neous signal-to-noise ratio, wherein selected subcarriers are turned ON or O FF to increase the transmit power and signal-to-noise ratio and reduce the I nter-Carrier Interference (ICI) and adverse effects of frequency selective f ading. |
