Pilot pattern design for a STTD scheme in an OFDM system

1. A transmitting device for transmitting data symbols and pilot symbols in an OFDM transmission system the transmitting device configured to:

generate said data symbols and said pilot symbols; and

transmit said data symbols and pilot symbols using a plurality of subcarriers of said OFDM transmission system, wherein

said generating said pilot symbols includes generating a first type pilot symbol and a second type pilot symbol being orthogonal to said first type pilot symbol so that a pilot symbol pattern in a frequency dimension comprises at least said first type pilot symbol to be transmitted using a first subcarrier and second type pilot symbol to be transmitted using a second subcarrier,

said pilot symbol pattern has a different pattern in a time dimension from a subsequent pilot symbol pattern, and

first pilot symbols are comprised in said pilot symbol pattern and second pilot symbols are comprised in said subsequent pilot symbol pattern, and corresponding first and second pilot symbols have a same frequency and time allocation.

2. The transmitting device of claim 1 , wherein

at least some of the first and second pilot symbols are identical and orthogonal to each other.

3. The transmitting device of claim 1 , wherein

at least some of the first and second pilot symbols are alternately identical and orthogonal to each other.

4. The transmitting device of claim 3 , wherein

corresponding first and second pilot symbols having the same frequency and time allocation are alternatingly identical and orthogonal to each other in the frequency and time dimension.

5. The transmitting device of claim 1 , wherein

the first and the second pilot symbols have a regular distribution in the time and the frequency dimension.

6. The transmitting device of claim 1 , wherein

the second pilot symbols alternately have identical and inverse complex value of the corresponding first pilot symbol in the time and frequency dimension.

7. A transmitting device for transmitting data symbols and pilot symbols in an OFDM transmission system, the transmitting device comprising:

circuitry configured to

generate said data symbols and said pilot symbols; and

transmit said data symbols and pilot symbols using a plurality of subcarriers of said OFDM transmission system, wherein

said generating said pilot symbols includes generating a first type pilot symbol and a second type pilot symbol being orthogonal to said first type pilot symbol so that a pilot symbol pattern in a frequency dimension comprises at least said first type pilot symbol to be transmitted using a first subcarrier and second type pilot symbol to be transmitted using a second subcarrier,

said pilot symbol pattern has a different pattern in a time dimension from a subsequent pilot symbol pattern, and

first pilot symbols are comprised in said pilot symbol pattern and second pilot symbols are comprised in said subsequent pilot symbol pattern, and corresponding first and second pilot symbols have a same frequency and time allocation.

8. The transmitting device of claim 7 , wherein

at least some of the first and second pilot symbols are identical and orthogonal to each other.

9. The transmitting device of claim 7 , wherein

at least some of the first and second pilot symbols are alternately identical and orthogonal to each other.

10. The transmitting device of claim 9 , wherein

corresponding first and second pilot symbols having the same frequency and time allocation are alternatingly identical and orthogonal to each other in the frequency and time dimension.

11. The transmitting device of claim 7 , wherein

the first and the second pilot symbols have a regular distribution in the time and the frequency dimension.

12. The transmitting device of claim 7 , wherein

the second pilot symbols alternately have identical and inverse complex value of the corresponding first pilot symbol in the time and frequency dimension.

13. A method for transmitting data symbols and pilot symbols in an OFDM transmission system, the method comprising:

generating said data symbols and said pilot symbols; and

transmitting said data symbols and pilot symbols using a plurality of subcarriers of said OFDM transmission system, wherein

said generating said pilot symbols includes generating a first type pilot symbol and a second type pilot symbol being orthogonal to said first type pilot symbol so that a pilot symbol pattern in a frequency dimension comprises at least said first type pilot symbol to be transmitted using a first subcarrier and second type pilot symbol to be transmitted using a second subcarrier,

said pilot symbol pattern has a different pattern in a time dimension from a subsequent pilot symbol pattern, and

first pilot symbols are comprised in said pilot symbol pattern and second pilot symbols are comprised in said subsequent pilot symbol pattern, and corresponding first and second pilot symbols have a same frequency and time allocation.

14. The transmitting method of claim 13 , wherein

at least some of the first and second pilot symbols are having a same time allocation and being identical and orthogonal to each other.

15. The transmitting method of claim 13 , wherein

at least some of the first and second pilot symbols are alternately identical and orthogonal to each other.