High-penetration radiocommunication system using a compact character set
US6421357B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1998 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Jun 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0071
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A high-penetration transmission method uses a compact character set for encoding an alphanumeric message, in which the signal margin is increased by a combination of bit repetition and a relatively small increase in power. The combination of bit repetition and a relatively small increase in power with a encoding via a compact character set avoids unacceptable delay characteristics. Moreover, the combination of repetition and a relatively small increase in power with the compact character set of the present invention avoids the co-channel interference problems of systems which rely solely on a power increase to increase the signal margin, as less power increase is required to obtain the same increase in signal margin for a given delay time. In one embodiment, a mobile radiocommunication system is provided with a short message service feature for transmitting alphanumeric messages to and from a mobile unit. In order to ensure reliable transmission over channels having severe attenuation, the communication system, a short message is encoded with a compact character set. The message may be further encoded with error detection or correction coding; the message is divided into packets or…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.