METHODS AND APPARATUSES USING FILTER BANKS FOR MULTI-CARRIER SPREAD SPECTRUM SIGNALS

摘要

A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit.

主权项

1. A method of transmitting a spread-spectrum signal, comprising:
spreading at least one data symbol to a plurality of frequencies across a frequency spectrum by encoding the at least one data symbol on each frequency of the plurality; applying a common pulse-shaping filter to each frequency of the plurality of frequencies including the at least one data symbol; applying a plurality of gains to the plurality of frequencies including the at least one data symbol, wherein each gain of the plurality of gains is correlated to each frequency among the plurality of frequencies; combining the plurality of frequencies to generate the spread-spectrum signal; and transmitting the spread-spectrum signal.