Method and apparatus for achieving data rate variability in orthogonal spread spectrum communication systems
US6366588B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A CDMA communication system is disclosed offering a near continuum of data rates up to a maximum rate. The disclosed CDMA communication system increases the data rate variability, without disturbing the orthogonality between users. An increased number of data rates is obtained by time multiplexing the data rates achievable with conventional CDMA systems to provide additional data rates for various multimedia applications. If a user is assigned a specific orthogonal code sequence, such as a Walsh sequence, which permits a maximum data rate, nR, with conventional systems, the user can obtain additional desired data rates up to the maximum rate nR, by time multiplexing the specific orthogonal code set. Desired bit rates are achievable for applications requiring bit rates that are not an integer multiple of the rates provided by conventional techniques. A fundamental rate of R or “fat pipe” rates of powers-of-two multiples of the fundamental rate can be achieved in a conventional manner. A desired rate up to the maximum “fat pipe” rate is achieved by time multiplexing the codes wkn to achieve rates between R and nR, where wkn, denotes the first nth of the spread…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.