发明名称 |
Multicode direct sequence spread spectrum |
摘要 |
In this patent, we present MultiCode Direct Sequence Spread Spectrum (MC-DSSS) which is a modulation scheme that assigns up to N DSSS codes to an individual user where N is the number of chips per DSSS code. When viewed as DSSS, MC-DSSS requires up to N correlators (or equivalently up to N Matched Filters) at the receiver with a complexity of the order of N2 operations. In addition, a non ideal communication channel can cause InterCode Interference (ICI), i.e., interference between the N DSSS codes. In this patent, we introduce new DSSS codes, which we refer to as the "MC" codes. Such codes allow the information in a MC-DSSS signal to be decoded in a sequence of low complexity parallel operations which reduce the ICI. In addition to low complexity decoding and reduced ICI. MC-DSSS using the MC codes has the following advantages: (1) it does not require the stringent synchronization DSSS requires, (2) it does not require the stringent carrier recovery DSSS requires and (3) it is spectrally efficient.
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申请公布号 |
US5555268(A) |
申请公布日期 |
1996.09.10 |
申请号 |
US19940186784 |
申请日期 |
1994.01.24 |
申请人 |
FATTOUCHE, MICHEL;ZAGHLOUL, HATIM |
发明人 |
FATTOUCHE, MICHEL;ZAGHLOUL, HATIM |
分类号 |
H04B1/707;H04J13/00;H04L5/02;H04L27/26;(IPC1-7):H04B1/707;H04B1/69 |
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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