Radio communication system
US6515960B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1998 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Aug 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/023
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio communication system is formed of a plurality of radio communication terminals and a radio communication control terminal for controlling radio communication. Data communication is performed between each radio communication terminal and the radio communication control terminal by the orthogonal frequency division multiplexing (OFDM) method. Data is multiplexed with a frame structure having the specified number of symbols by the TDMA method. The radio communication control terminal transmits a synchronization acquisition code to the plurality of radio communication terminals in each frame. Each radio communication terminal receives the synchronization acquisition code, sets a timer according to the receiving timing of the synchronization acquisition code, and sets the transmission timing and the receiving timing with the timer being used as the reference. With the use of the OFDM method, demodulation is performed without an error even if jitter occurs. Since the timing of transmission and receiving is set with an M sequence at the top of a frame being used as a reference, the timer of each radio communication terminal is set to the same time. With the use of this time inform…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.