Method for coding data symbols
View Patent ↗Data symbols, transmitted by OFDM radio using at least two transmission antennae, are coded by a DSTBC coding and a DSTFBC coding. Two adjacent data symbols of a selected sub-carrier are provided for initializing a DSTFBC coding in a sub-carrier direction and are used for DSTFBC coding of similarly positioned data symbols in further sub-carriers in the sub-carrier. The DSTFBC coding is carried out from the data symbols of the first sub-carrier direction. In each sub-carrier the two data symbols formed by DSTFBC coding are used for initializing a DSTBC coding in the OFDM symbol direction. In the reverse direction, two sequential DSTBC coded data symbols on a first sub-carrier for initializing a DSTFBC coding in a sub-carrier direction and are used for DSTFBC coding of similarly positioned data symbols in further sub-carriers for DSTFBC coding from the data symbols of the first sub-carrier over the adjacent sub-carriers.
1. A method for coding data symbols transmitted in an orthogonal frequency division multiplex radio transmission via at least two transmitting antennas, comprising:
providing two first adjacent data symbols of a selected first subcarrier for initialization of differential space time frequency block code coding which takes place in a subcarrier direction;
using the two first adjacent data symbols of the selected first subcarrier for differential space time frequency block code coding of similarly positioned data symbols of other subcarriers, where the differential space time frequency block code coding takes place from the data symbols of the first subcarrier onward over adjacent subcarriers in the subcarrier direction, each subcarrier having at two symbol positions two further adjacent data symbols formed by differential space time frequency block code coding in dependence on the two first adjacent data symbols of the first subcarrier;
using on each other subcarrier the two further adjacent data symbols, formed by differ-ential space time frequency block code coding, for initialization of a differential space time block code coding, taking place in an orthogonal frequency division multiplex symbol direction, which is carried out from a third orthogonal frequency division multiplex data symbol onward, and
using on the selected first subcarrier, the two first adjacent data symbols formed by differential space time frequency block code coding, for initialization of a differential space time block code coding, taking place in an orthogonal frequency division multiplex symbol direction, which is carried out from a third orthogonal frequency division multiplex data symbol onward.
2. The method as claimed in claim 1 , further comprising using a robust modulation method for transmission of the data symbols required for the initialization and/or for transmission of the coded data symbols.
3. The method as claimed in claim 2 , wherein binary phase shift key modulation is used as the robust modulation method.
4. The method as claimed in claim 3 , further comprising switching between a two-stage coding method and another coding method in dependence on previously known or estimated radio channel characteristics.
5. The method as claimed in claim 2 , further comprising switching between a two-stage coding method and another coding method in dependence upon previously known or estimated radio channel characteristics.
6. The method as claimed in claim 1 , further comprising switching between a two-stage coding method and another coding method in dependence upon previously known or estimated radio channel characteristics.
7. A method for coding data symbols transmitted in an orthogonal frequency division multiplex radio transmission via at least two transmitting antennas, comprising:
differential space time block code coding, taking place in an orthogonal frequency division multiplex symbol direction, on a selected first subcarrier over a selected number of data symbols;
providing two first successive differential space time block code-coded data symbols of the selected first subcarrier for initialization of a differential space time frequency block code coding which takes place in a subcarrier direction;
using the two first successive differential space time block code-coded data symbols of the selected first subcarrier for the differential space time frequency block code coding of similarly positioned data symbols of other subcarriers, where the differential space time frequency block code coding takes place from the two first successive differential space time block code-coded data symbols of the selected first subcarrier onward over adjacent subcarriers in the subcarrier direction, so that each subcarrier has at two symbol positions two adjacent data symbols which were formed by differential space time frequency block code coding in dependence on the two first successive data symbols of the selected first subcarrier, and
using on each subcarrier, the two adjacent data symbols, formed by differential space time frequency block code coding, for initialization of a differential space time block code coding, taking place in an orthogonal frequency division multiplex symbol direction, which is carried out from a third orthogonal frequency division multiplex data symbol onward.
8. The method as claimed in claim 7 , further comprising using a robust modulation method for transmission of the data symbols required for the initialization and/or for transmission of the coded data symbols.
9. The method as claimed in claim 8 , wherein binary phase shift key modulation is used as the robust modulation method.
10. The method as claimed in claim 9 , further comprising switching between a two-stage coding method and another coding method in dependence on previously known or estimated radio channel characteristics.
11. The method as claimed in claim 8 , further comprising switching between a two-stage coding method and another coding method in dependence upon previously known or estimated radio channel characteristics.
12. The method as claimed in claim 7 , further comprising switching between a two-stage coding method and another coding method in dependence upon previously known or estimated radio channel characteristics.