High data rate spread-spectrum system and method
US6353627B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/004
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A high data rate, high processing gain, direct sequence spread spectrum system that transmits a BPSK or QPSK signal. The system FEC encodes and interleaves data which are collected and stored and forwarded N bits at a time by transmitting one of 2N pseudo random waveforms every time N bits are collected. The 2N pseudo random waveforms can be sent as an orthogonal, bi-orthogonal, or nearly orthogonal waveform. During acquisition, a plurality of product devices multiply a received spread-spectrum signal by a header chip-sequence signal. In each case, the header chip-sequence signal has a different delay, with each delay being at most one chip. Acquisition can also be achieved using a matched filter. After acquisition, the plurality of product device multiply the received spread-spectrum signal by 2N chip-sequence signals to generate a plurality of products, with each chip-sequence signal of the plurality of chip-sequences signals being different from other chip-sequence signals of the plurality of chip-sequence signals; a plurality of integrators integrate the plurality of products thereby forming 2N correlators, and a comparator selects a largest value from the plurality of integrat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.