Path searched device and CDMA receiver with the same

A receiver for a direct-sequence code division multiple access (CDMA) system including a reception demodulator, a despreading unit, a determination unit and a path searching device, comprising:

• the path searching device including:
• a sampling unit for sampling an input signal from the reception demodulator to produce a first sampled signal and a second sampled signal;
• a first circuit for finding a maximum correlation value between the first sampled signal and a spreading code;
• and
• a second circuit for providing despread timing of the input signal to the despreading unit according to correlation values between the second sampled signal and a spreading code corresponding to the timing of the maximum correlation value of the first circuit.

A receiver for a direct-sequence code division multiple access (CDMA) system including a reception demodulator, a despreading unit, a determination unit and a path searching device, comprising:

• the path searching device including:
• a sampling unit for sampling an input signal from the reception demodulator to produce a first sampled signal and a second sampled signal;
• and
• a matched filter for finding a maximum correlation value between the first sampled signal and a spreading code when the first sampled signal is applied to the matched filter, the matched filter further providing despread timing of the input signal to the despreading unit according to correlation values between the second sampled signal and a spreading code corresponding to the maximum correlation value when the second sampled signal is applied to the matched filter.

A path searching method for determining despread timing of an input signal in a direct-sequence code division multiple access (CDMA) system, comprising:

• sampling the input signal to produce a first sampled signal and a second sampled signal;
• finding a maximum correlation value between the first sampled signal and a spreading code;
• and
• determining the despread timing of the input signal according to correlation values between the second sampled signal and a spreading code corresponding to the maximum correlation value.