Demodulation method for receiver
US6782037B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1999 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Jul 27, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0028
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a wireless communication system, the constellation mapping scheme employed may be changed on a per-time-slot basis, i.e., from time slot to time slot, so that the constellation used to encode the symbols of each time slot may be different for each time slot within a single frame and may be different for a particular time slot in different consecutive frames. In other words, several constellation mapping schemes are available, with each providing the ability to transmit a different number of bits per symbol, and the particular constellation mapping scheme employed for any time slot need be selected for that time slot only. The ability to use any particular constellation mapping scheme is dependent on the current channel quality. The particular constellation mapping used for the user data of the time slot may be indicated in the preamble of the time slot. To this end, each time slot may have its own preamble that is mapped with a constellation mapping scheme which is a) known à priori, b) may be the same for all time slots, and c) may be different from the constellation mapping scheme used to encode user data in the time slot. A receiver can determine the constellation mapp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.