发明名称 |
COHERENT DUAL-CHANNEL QPSK MODULATOR, DEMODULATOR AND MODULATING AND DEMODULATING METHOD FOR CDMA SYSTEMS |
摘要 |
A coherent dual-channel QPSK modulator/demodulator for a CDMA system, and modulating/demodulating methods therefor, are disclosed, in which the crosstalk interferences between an I-channel and a Q-channel are eliminated by an orthogonal spreading method, which assigns different Walsh codes to the I-channel and Q-channel. Pseudo-random modulation and pseudo-random demodulation are carried out by using one PN code so as to minimize the channel parameter estimation errors, thereby improving receiving performance. |
申请公布号 |
KR0159201(B1) |
申请公布日期 |
1998.12.01 |
申请号 |
KR19950047060 |
申请日期 |
1995.12.06 |
申请人 |
KETRI |
发明人 |
KIM, SUNG-RAK;LEE, HUN;KANG, BYUNG-SIK;JUNG, JAE-UK |
分类号 |
H04L27/18;H04B1/707;H04B15/00;H04J13/18;H04K1/00;H04L27/30;H04L27/34 |
主分类号 |
H04L27/18 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|