Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-01-03
2006-01-03
Phu, Phuong (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S145000, C375S367000, C375S152000, C375S150000, C370S515000, C370S342000
Reexamination Certificate
active
06983009
ABSTRACT:
An improvement for a method and system for tracking a spreading code, used in a code division multiple access (CDMA) system. An input signal has spread-spectrum modulation. The spreading code embedded in the spread-spectrum modulation has a plurality of chips. The input signal is sampled, and half-chip offset samples are formed from the sampled input signal. An even set of the half-chip offset samples are grouped into an early set of samples, and an odd set of the half-chip offset samples are grouped into a late set of samples. Each early set of samples is multiplied by the spreading code c(n+1), c(n+2), . . . , c(n+L), to generate a first plurality of products. L is approximately equal to the number of chips of delay between the earliest and latest multipath signals. A first plurality of sums and magnitudes are computed from the first plurality of products. The first plurality of magnitudes are summed to generate an early signal-energy value. Each late set of samples is multiplied by the spreading-code c(n−1), c(n−2), . . . , c(n−L), thereby generating a second plurality of products. A second plurality of sums and magnitudes are computed from the second plurality of products. The second plurality of magnitudes are summed to generate a late signal-energy value. A difference is calculated between the early signal-energy value and the late signal-energy value, thereby producing an error signal.
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patent:
InterDigital Technology Corporation
Phu Phuong
Volpe and Koenig P.C.
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