发明名称 |
Channel compensator for DS-CDMA receiver |
摘要 |
A channel compensator for estimating and for compensating a phase change and a residual frequency offset of a despreaded signal, prior to synchronous demodulation in a DS-CDMA receiver. In the channel compensator, a first integrator accumulates input signals sampled at a given chip rate for a predetermined period and multiplies the accumulated value by a given gain. A shift register having a plurality of registers shifts the data output from the first integrator. A second integrator integrates the data generated at once from the respective registers of the shift register. A delay means delays the input signal for a predetermined time, and a multiplier multiplies the delayed input signal by an output of the second integrator in order to generate the compensated signal. The delay device delays the input signal by a time required for the input signal to reach a central register of the shift register through the first integrator. The second integrator includes a summer means for summing the values of the respective registers of the shift register at an update period of the first integrator, and a multiplier for multiplying a value output from the summer means by a reciprocal number of the number of the registers to reduce the dispersion of an estimation value due to noises, and for adjusting a bit value for detected information.
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申请公布号 |
US6577674(B1) |
申请公布日期 |
2003.06.10 |
申请号 |
US19990390117 |
申请日期 |
1999.09.03 |
申请人 |
SAMSUNG ELECTRONICS CO, LTD. |
发明人 |
KO SEOK-JUN;LEE KYUNG-HA;CHOI HYUNG-JIN |
分类号 |
H04L25/02;(IPC1-7):H04B15/00;H04K1/00;H04L27/30 |
主分类号 |
H04L25/02 |
代理机构 |
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主权项 |
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地址 |
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