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US 6,724,838 B2Granted
Methods and apparatus to despread dual codes for CDMA systems
AssigneeIndustrial Technology Research Institute
InventorsChung Wei-Ku, Fu-Yen Kuo
Life of this patent
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Abstract
A correlator and matched filter for use with coded transmission, such as CDMA, form new codes from the sums and differences of the original codes, where only one of the new codes is non-zero for each element position and effect hardware savings using the new codes.
Claims6
A dual code correlator coupled to an input signal and a pair of multi-element codes designed such that only one of the corresponding elements of each code is zero, the correlator comprising
- a register bank containing a plurality of partial results;
- an adder circuit receiving the input signal and a partial result;
- steering circuits for directing the output of the adder circuit to the register bank and for directing the appropriate one of the partial results from the register bank to the adder circuit, wherein the appropriate partial result corresponds to different combination of the multi-element codes and the sign of the input signal;
- and
- an adder/subtractor circuit to form correlation results from the partial results outputted by the register bank.
2 more elements
Dependencies are inferred from the claim text.