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US 2003/0189971 A1Published application
Obtaining initial code synchronization in a CDMA communication system
AssigneeLG Electronics Inc.
InventorMin-Ho Jin
Life of this patent
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Abstract
A code detector which may rapidly obtain initial code synchronization by generating different phases of a pseudo noise (PN) codes by a plurality of PN code generators. Also, the code detector implements multipliers in the code detector to perform simple and rapid multiplying operations of the output of the PN code generators.
Claims31
A method comprising:
- adding at least two distinct demodulation codes to produce a sum;
- multiplying a data signal by the sum to produce a product;
- and
- determining, from the product, if at least one of the two distinct demodulation codes corresponds to data embodied in the data signal.
1 more element
An apparatus for obtaining initial code synchronization in a CDMA communication system, comprising:
- a code generator configured to generate a plurality of pseudo noise (PN) codes, adding the codes, and outputting the result;
- a multiplier configured to multiply the outputted code and a received signal;
- an integrator configured to output a correlative value by accumulating the value outputted from the multiplier for a predetermined section;
- and
- a synchronization discriminator configured to compare the value outputted from the integrator and a predetermined critical value.
2 more elements
A method for obtaining initial code synchronization in a CDMA communication system, comprising:
- obtaining a received signal and correlative energy for a predetermined period by adding two pseudo noise (PN) codes;
- comparing the correlative energy and a predetermined first critical value;
- and
- searching which code is synchronized with the received signal if the correlative energy is higher than the first critical value as a result of the comparing.
1 more element
A method for obtaining initial code synchronization in a CDMA communication system, comprising:
- determining a correlative energy for the product of a received signal and a sum of at least two pseudo noise (PN) codes;
- comparing the correlative energy and predetermined first critical value;
- delaying or accelerating phases of two PN codes, if the correlative energy is lower than the first critical value;
- and
- determining which code of the two PN codes is synchronized with the received signal, if the correlative energy is higher than the first critical value.
2 more elements
Dependencies are inferred from the claim text.