发明名称 |
METHOD AND APPARATUS OF CDMA SPREAD SPECTRUM FOR THE MULTIMEDIA SERVICE WITH VARIOUS RATE |
摘要 |
An apparatus for spreading the information signals in a CDMA (Code Division Multiple Access) system supporting various information rates, and more particularly, to an apparatus for selecting a channel-separating and PN (Pseudo-random Noise) spreading method according to the rate of the symbol to spread. One channel-separating and/or PN spreading method is selected from two different spreading methods according to a condition among the symbol rate, the length of the orthogonal code, and the chip rate. One spreading method is to use an orthogonal code and the long PN code with a fixed time offset as the channel-separating and the PN spreading code, respectively. The other is to use the long code with different time offset for each channel as the channel-separating and/or PN spreading code. The spreading method gives lots of flexibility in system design and also reduces the multiple access interference among channels with a certain rate. |
申请公布号 |
KR100219035(B1) |
申请公布日期 |
1999.09.01 |
申请号 |
KR19970008533 |
申请日期 |
1997.03.13 |
申请人 |
KOREA TELECOM CORP. |
发明人 |
NOH, JUNE-CHUL;CHOI, YANG-HO;PYO, HYUN-MYUNG |
分类号 |
H04B1/707;H04B7/24;H04B7/26;H04J11/00;H04J13/16;H04W28/18 |
主分类号 |
H04B1/707 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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