Apparatus and method for code tracking in an IS-95 spread spectrum communications system
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United States of America Patent
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Mar 20, 2001
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N/A
app pub date -
Dec 23, 1997
filing date -
Dec 23, 1997
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Abstract
A pseudo-noise generator (516) generates an on-time component, an early component and a late component of a pseudo-noise code signal in response to an error signal. The on-time component is routed to a deinterleave and demodulate device (210) which demodulates and decodes baseband signals from received spread spectrum signals. An adder (518) subtracts the early component from the late component to form a summation signal. A multiplier (520) multiplies the summation with the received signal to form a product signal. An integrator (522) integrates the product signal to form the error signal. The error signal is fed back into the pseudo-noise generator (516) to fine tune the on-time component, the early component and the late component of the pseudo-noise code signal. As a result, a spread spectrum signal is demodulated and decoded using only one correlator (504) instead of two.
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