Pulse or digital communications – Repeaters – Testing
Patent
1994-01-24
1996-09-10
Gregory, Bernarr E.
Pulse or digital communications
Repeaters
Testing
375200, 380 34, 370 19, 370 21, 370 22, H04B 1707, H04B 169
Patent
active
055552684
ABSTRACT:
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 N.sup.2 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.
REFERENCES:
patent: 4928310 (1990-05-01), Goutzoulis et al.
patent: 4933952 (1990-06-01), Albrieux et al.
patent: 4944009 (1990-07-01), Micali et al.
patent: 5235614 (1993-08-01), Bruckert et al.
Fattouche Michel
Zaghloul Hatim
Dykas Frank J.
Gregory Bernarr E.
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