Structured space-time code achieving the full diversity and full rate and generating method thereof, and multi-input multi-output system

• US 7,903,753 B2
• Filed: 02/28/2005
• Issued: 03/08/2011
• Est. Priority Date: 09/03/2004
• Status: Active Grant

• Current Assignee: Ajou University Industry Cooperation Foundation, Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Seung-joon, Yeh, Choong-Il, Kwon, Dong-Seung, Hwang, Seung-Ku, Lim, Hyoung-Soo, Choi, In-Kyeong, Oh, Jong-Ee, Lim, Kwang-Jae, Kim, Seong-Rag, Song, Young-Seog, Lee, Yu-Ro, Oh, Seong-Keun, Lee, Moon-Il
• Primary Examiner(s): Payne, David C
• Assistant Examiner(s): Flores, Leon
• Application Number:
  US11/574,725
• Publication Number:
  US 20080225975A1
• Time in Patent Office: 2,199 Days
• Field of Search: 375/260, 375/267, 375/299, 375/347, 455/101, 455/132, 455/296, 455/500, 455/562.1, 370/334
• US Class Current: 375/267
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0612 Space-time modulation

Abstract

A space-time code used for a transmitter to transmit a plurality of data symbols to a receiver in a MIMO system, the space-time code including a code word matrix for transmitting an amount of data symbols corresponding to a product of the number of transmit antennas and a spatial multiplexing rate during one block period, wherein a row index indicates combined signals transmitted through different transmit antennas and a column index indicates time slots that correspond to the number of transmit antennas, and wherein the number of data symbols allocated to each transmit antenna in a code block corresponds to the spatial multiplexing rate, and the data symbols are combined by different combining coefficients for each transmit antenna at every time slot, and simultaneously transmitted through different transmit antennas, and each transmit antenna transmits a different set of data symbols at every time slot.

Claims

1. A system having multiple transmit antennas, comprising:

a transmitter configured to transmit a plurality of data symbols to a receiver according to a space-time code including a code word matrix,

wherein the transmitter is configured to transmit an amount of data symbols corresponding to a product of the number of transmit antennas and a spatial multiplexing rate during one code block period, a row index of the code word matrix indicating combined signals transmitted through different transmit antennas and a column index of the code word matrix indicating time slots; and

wherein the average number of data symbols allocated to each transmit antenna at every time slot is equal to the spatial multiplexing rate, the data symbols allocated to each transmit antenna at every time slot are combined together using a set of combining coefficients and transmitted through the corresponding transmit antenna, and each transmit antenna transmits a different set of data symbols from a time slot to another, the set of combining coefficients that combines the data symbols allocated to each transmit antenna to be different for each time slot.

2. The system of claim 1, wherein when the average number of data symbols that corresponds to the spatial multiplexing rate is allocated to each transmit antenna at every time slot of the code word matrix, the same number of data symbols is allocated to each transmit antenna for transmission.

3. The system of claim 1, wherein when the average number of data symbols that corresponds to the spatial multiplexing rate is allocated to each transmit antenna at every time slot of the code word matrix, a different number of data symbols is allocated to each transmit antenna for transmission.

4. The system of claim 1, wherein when the average number of data symbols that corresponds to the spatial multiplexing rate is allocated to each transmit antenna at every time slot of the code word matrix, a portion of the data symbols is duplicated to each transmit antenna in a code block period.

5. The system of claim 1, wherein when the average number of data symbols that corresponds to the spatial multiplexing rate is allocated to each transmit antenna at every time slot of the code word matrix, different sets of data symbols are allocated to the respective transmit antennas for transmission.

6. The system of claim 1, wherein when the data symbols allocated to each transmit antenna are combined together and simultaneously transmitted through the corresponding transmit antenna, the data symbols allocated to each transmit antenna are combined together with a set of combining coefficients from a transmit antenna to another.

7. The system of claim 6, wherein the data symbols allocated to each transmit antenna are combined together using only real-number coefficients.

8. The system of claim 6, wherein the data symbols allocated to each transmit antenna are combined together using complex-number coefficients.

9. The system of claim 8, wherein when combining the data symbols using the complex-number coefficients at each transmit antenna, only complex numbers with all having the same magnitude are used to combine together the data symbols for each transmit antenna.

10. The system of claim 1, wherein when each transmit antenna transmits a different set of data symbols from a time slot to another, the number of data symbols transmitted through the corresponding transmit antenna is set to be equal from a time slot to another.

11. The system of claim 1, wherein when each transmit antenna transmits a different set of data symbols from a time slot to another, the number of data symbols transmitted in a time slot is set to be equal from a time slot to another.

12. The system of claim 1, wherein when each transmit antenna transmits a different set of data symbols from a time slot to another, the number of data symbols to be transmitted in a time slot is set to be different from a time slot to another.

13. The system of claim 1, wherein when setting a code word matrix to transmit a plurality of data symbols that corresponds to a product of the number of transmit antennas and the spatial multiplexing rate during one code block period, every data symbols to be transmitted in the code block is allocated at least once to all transmit antennas during one code block period.

14. A system, comprising:

a transmitter having multiple transmit antennas; and

a receiver having multiple receive antennas and configured to decode a plurality of input data input through the multiple receive antennas of the receiver according to a decoding rule based on a space-time code,

wherein the space-time code comprises a square code word matrix for transmitting an amount of data symbols corresponding to a product of the number of transmit antennas and a spatial multiplexing rate during one code block period, a row index of the code word matrix indicating combined signals transmitted through different transmit antennas and a column index of the code word matrix indicating time slots; and

wherein the average number of data symbols allocated to each transmit antenna at every time slot is equal to the spatial multiplexing rate, the data symbols allocated to each transmit antenna at every time slot are combined together using a set of combining coefficients and simultaneously transmitted through the corresponding transmit antenna, and each transmit antenna transmits a different set of data symbols from a time slot to another, the set of combining coefficients that combines the data symbols allocated to each transmit antenna to be different for each time slot.