| US 7,522,653 B2 | ||
| System and method for PN correlation and symbol synchronization | ||
| Dan M. Griffin, Bountiful, Utah (US); Richard B. Ertel, Sandy, Utah (US); Johnny M. Harris, Centerville, Utah (US); Kenneth C. Bark, West Jordan, Utah (US); and Zachary C. Bagley, Salt Lake City, Utah (US) | ||
| Assigned to L-3 Communications, Corp., New York, N.Y. (US) | ||
| Filed on Jan. 27, 2005, as Appl. No. 11/46,361. | ||
| Prior Publication US 2006/0165157 A1, Jul. 27, 2006 | ||
| Int. Cl. H04B 1/00 (2006.01) | ||
| U.S. Cl. 375—147 [375/136] | 40 Claims |
| 1. A method for symbol synchronization of a spread spectrum signal at a receiver when a symbol boundary of the signal is not
on a pseudo-random noise (“PN”) epoch or is otherwise unknown, comprising the steps of:
despreading the spread spectrum signal in a receiver to form a despread signal;
integrating the despread signal in the receiver for a plurality of symbol times at a rate of N integrations per symbol time
to form N symbol energies per symbol for a plurality of symbols, wherein each of the N symbol energies corresponds to a different
symbol time hypothesis;
adding in the receiver the N symbol energies of one of the symbols of the plurality of symbols to the N symbol energies of
at least one of the remaining symbols of the plurality of symbols respectively to form N summed symbol time hypotheses; and
finding in the receiver an Nth summed symbol time hypothesis of the N summed symbol time hypotheses, the Nth summed symbol
time hypothesis having a maximum energy of the N summed symbol time hypotheses, wherein a location of the Nth summed symbol
time hypothesis relates to a location of the symbol boundary.
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