Open-loop diversity technique for systems employing four transmitter antennas
US7050510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Apr 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0618
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When using four transmit antennas, conventional channel coding is employed for a decoupled space-time coding approach for each of a number, L, of data substreams derived from the overall source bit stream. The symbols of the data substreams, after any encoding, are processed and the resulting derivatives of the encoded data substreams, which includes at least the complex conjugate of one of the encoded symbols, are grouped to form four transmit time sequences each one spanning L symbol periods which form a transmission matrix B. Each row of the matrix corresponds to an antenna, and the elements of each row represent the samples of a temporal sequence that is emitted by the antenna in L symbol periods. When L=4 the matrix B can be arranged as follows:where b1, b2, b3, and b4 are the encoded symbols from the data substreams and * indicates complex conjugate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.