System and method for improved spread spectrum signal detection
First Claim
1. For use in a direct sequence spread spectrum (DSSS) receiver adapted to receive a differential phase shift keyed (DPSK) packet on a channel, said DPSK packet having a training preamble and a data portion, a system to improve detection of said packet under degraded channel conditions, comprising:
- a detection circuit that derives phase information from symbols in said packet and a weight that is a function of an estimated power profile for said channel; and
a computation circuit that computes a weighted average for said phase information using said weight, said weighted average being power profile-based to allow said receiver to detect said channel more reliably under said degraded channel conditions.
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Accused Products
Abstract
For use in a direct sequence spread spectrum ("DSSS") receiver adapted to receive a differential phase shift keyed ("DPSK") packet on a channel, the DPSK packet having a training preamble and a data portion, a system to improve detection of the packet under degraded channel conditions, comprising: (1) a detection circuit that derives phase information from symbols in the packet and a weight that is a function of an estimated power profile for the channel and (2) a computation circuit that computes a weighted average for the phase information using the weight, the weighted average being power profile-based to allow the receiver to detect the data contained in the packet more reliably under the degraded channel conditions.
85 Citations
21 Claims
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1. For use in a direct sequence spread spectrum (DSSS) receiver adapted to receive a differential phase shift keyed (DPSK) packet on a channel, said DPSK packet having a training preamble and a data portion, a system to improve detection of said packet under degraded channel conditions, comprising:
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a detection circuit that derives phase information from symbols in said packet and a weight that is a function of an estimated power profile for said channel; and a computation circuit that computes a weighted average for said phase information using said weight, said weighted average being power profile-based to allow said receiver to detect said channel more reliably under said degraded channel conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. For use in a direct sequence spread spectrum (DSSS) receiver adapted to receive a differential phase shift keyed (DPSK) packet on a channel, said DPSK packet having a training preamble and a data portion, a method of improving detection of said packet under degraded channel conditions, comprising the steps of:
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deriving phase information from symbols in said packet and a weight that is a function of an estimated power profile for said channel; and computing a weighted average for said phase information using said weight, said weighted average being power profile-based to allow said receiver to detect said phase information from said channel more reliably under said degraded channel conditions. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A mobile station, comprising:
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a direct sequence spread spectrum (DSSS) receiver adapted to receive a differential phase shift keyed (DPSK) packet on a channel, said DPSK packet having a training preamble and a data portion, said receiver having; a radio frequency (RF) demodulator tunable to a frequency of a carrier of said channel, a correlator, coupled to said RF demodulator, that detects symbols in said packet, a carrier detector, coupled to said correlator, that detects a presence of said carrier, a detection circuit, coupled to said correlator, that, when said carrier detector detects said presence, derives phase information from symbols in said packet and a weight that is a function of an estimated power profile for said channel, and a computation circuit that computes a weighted average for said phase information using said weight, said weighted average being power profile-based to allow said receiver to detect said phase information from said channel more reliably under degraded channel conditions, and a descrambler, coupled to said detection circuit, that produces a stream of digital data from said symbols in said packet. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification