Patent ID: 7656931
Filing Date: 2010-02-02
Classification: H04B

Abstract:
1. A transmitter for generating a hybrid spread-spectrum signal to transmit data bits, wherein each of the data bits has a data bit time, the transmitter comprising: a pseudo-random code generator configured to generate a first stream of pseudo-random code words and a second stream of pseudo-random code words, wherein the second stream of pseudo-random code words is generated as a function of the first stream of pseudo-random code words to interrelate the second stream of pseudo-random code words to the first stream of pseudo-random code words based upon a predetermined relationship; a direct sequence generation circuit configured to receive the data bits to be transmitted and the first stream of pseudo-random code words, the direct sequence generation circuit configured to generate a direct sequence spread spectrum signal including a plurality of sub-sequences of chips for each of the data bits based upon the first stream of pseudo-random code words; a programmable direct digital frequency synthesizer coupled to the pseudo-random code generator to receive the second stream of pseudo-random code words, the programmable direct digital frequency synthesizer configured to generate a carrier signal at a sequence of carrier frequencies for each of the data bits based upon a sequence of the pseudo-random code words of the second stream of pseudo-random code words received by the programmable direct digital frequency synthesizer during each data bit time; and a modulator in communication with the direct sequence generation circuit and the programmable direct digital frequency synthesizer, the modulator configured to modulate the carrier signal with the direct sequence spread spectrum signal to generate a direct sequence fast frequency hopped spread spectrum signal.