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US 8,300,721 B2Granted
Pseudorandom noise code acquisition in direct sequence spread spectrum systems
AssigneeAgilent Technologies, Inc.
InventorWai Kwok Law
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Abstract
A method for receiving spread spectrum signals and for initial code acquisition from the received signals comprises de-spreading the received signals, based on code phase synchronization, to produce a de-spread signal; and performing a modulation detection based on a change of time-domain characteristic of the de-spread signal.
Claims26
An initial code acquisition method, comprising:
- receiving a spread spectrum signal including symbols;
- de-spreading the received spread spectrum signal based on code phase synchronization to produce a de-spread signal;
- and
- detecting a modulation format of the received spread spectrum signal based on a change of a time-domain characteristic of the de-spread signal,
- wherein the change of a time-domain characteristic comprises a magnitude variation in a despread symbol in the de-spread signal.
2 more elements
An initial code acquisition system, comprising:
- de-spreading circuitry for de-spreading a received spread spectrum signal based on code phase synchronization to produce a de-spread signal comprising symbols;
- and
- a modulation detector for detecting a modulation format of the received spread spectrum signal based on a change of a time-domain characteristic of the de-spread signal,
- wherein the change of a. time-domain characteristic comprises a magnitude variation in a despread symbol in the de-spread signal.
1 more element
Dependencies are inferred from the claim text.