Systems and methods for a multiple-input-multiple-output (MIMO) data transmission scheme using a space time block code (STBC)

1. A method for transmitting data on a multiple-input-multiple-output (MIMO) channel using a space time block code (STBC), the method comprising:

obtaining, at a wireless transmitter, a data stream including a plurality of data symbols to transmit;

determining whether a data symbol from the data stream is a last symbol in the data stream;

in response to determining that the data symbol is not the last symbol in the data stream, generating a STBC using the data symbol and a next data symbol from the data stream and transmitting the STBC to the MIMO channel; and

in response to determining that the data symbol is the last symbol in the data stream and that the data stream has an odd number of data symbols, pre-coding only the last data symbol based on a pre-determined pre-coding matrix and transmitting the pre-coded data symbol to the MIMO channel.

2. The method of claim 1 , further comprising:

calculating a number of data symbols from the plurality of data symbols by dividing a total number of data bits based on a number of data bits per every orthogonal frequency-divisional multiplexing (OFDM) symbol.

3. The method of claim 2 , further comprising:

determining whether the calculated number of data symbols from the plurality of data symbols is an even number or an odd number;

in response to determining that the calculated number of data symbols from the plurality of data symbols is an odd number:

using a maximum even number of data symbols from the odd number of data symbols to generate a plurality of STBCs in a form of a two-by-two matrix, and

pre-coding the last symbol using the pre-determined pre-coding matrix.

4. The method of claim 3 , further comprising:

calculating a number of data padding bits based on the calculated number of data symbols; and

performing data padding for the plurality of data symbols.

5. The method of claim 4 , further comprising:

selecting an average padding length for the data padding as half-symbol when the calculated number of data symbols from the plurality of data symbols is an even number; and

selecting an average padding length for the data padding as one and a half symbols when the calculated number of data symbols from the plurality of data symbols is an odd number.

6. The method of claim 1 , further comprising:

constructing the pre-coding matrix depending on availability of channel information.

7. The method of claim 1 , further comprising:

constructing the pre-coding matrix to indicate that the last data symbol is transmitted using one antenna at the wireless transmitter; and

specifying information of the one antenna for transmitting the last data symbol in a data field of the last data symbol.

8. The method of claim 1 , further comprising:

constructing the pre-coding matrix to indicate that the last data symbol is repeatedly transmitted at multiple antennas at the wireless transmitter.

9. The method of claim 8 , further comprising:

normalizing transmission power for the last data symbol among the number of the multiple antennas.

10. The method of claim 1 , further comprising:

transmitting information relating to the pre-coding matrix to a wireless receiver.

11. A system for transmitting data on a multiple-input-multiple-output (MIMO) channel using a space time block code (STBC), the system comprising:

a wireless transmitter configured to obtain a data stream including a plurality of data symbols to transmit;

control circuitry configured to:

determine whether a data symbol from the data stream is a last symbol in the data stream,

in response to determining that the data symbol is not the last symbol in the data stream, generate a STBC using the data symbol and a next data symbol from the data stream, and

in response to determining that the data symbol is the last symbol in the data stream and that the data stream has an odd number of data symbols, pre-code only the last data symbol based on a pre-determined pre-coding matrix; and

the wireless transmitter being configured to transmit the STBC and the pre-coded data symbol to the MIMO channel.

12. The system of claim 11 , wherein the control circuitry is further configured to:

calculate a number of data symbols from the plurality of data symbols by dividing a total number of data bits based on a number of data bits per every orthogonal frequency-divisional multiplexing (OFDM) symbol.

13. The system of claim 12 , wherein the control circuitry is further configured to:

determine whether the calculated number of data symbols from the plurality of data symbols is an even number or an odd number;

in response to determining that the calculated number of data symbols from the plurality of data symbols is an odd number:

use a maximum even number of data symbols from the odd number of data symbols to generate a plurality of STBCs in a form of a two-by-two matrix, and

pre-code the last symbol using the pre-determined pre-coding matrix.

14. The system of claim 13 , wherein the control circuitry is further configured to:

calculate a number of data padding bits based on the calculated number of data symbols; and

perform data padding for the plurality of data symbols.

15. The system of claim 14 , wherein the control circuitry is further configured to:

select an average padding length for the data padding as half-symbol when the calculated number of data symbols from the plurality of data symbols is an even number; and

select an average padding length for the data padding as one and a half symbols when the calculated number of data symbols from the plurality of data symbols is an odd number.

16. The system of claim 11 , wherein the control circuitry is further configured to:

construct the pre-coding matrix depending on availability of channel information.

17. The system of claim 11 , wherein the control circuitry is further configured to:

construct the pre-coding matrix to indicate that the last data symbol is transmitted using one antenna at the wireless transmitter; and

specify information of the one antenna for transmitting the last data symbol in a data field of the last data symbol.

18. The system of claim 11 , wherein the control circuitry is further configured to:

construct the pre-coding matrix to indicate that the last data symbol is repeatedly transmitted at multiple antennas at the wireless transmitter.

19. The system of claim 18 , wherein the control circuitry is further configured to:

normalize transmission power for the last data symbol among the number of the multiple antennas.

20. The system of claim 11 , wherein the wireless transmitter is further configured to:

transmit information relating to the pre-coding matrix to a wireless receiver.