Abstract
Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined.
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4G | 02/11/2017 | ISLD-201801-001 | APPLE INC |
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Specification Information
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Technologies
Product
Use Cases
Services
Claim
d for transmitting on four antennas comprising:
pre-coding information bits to generate four transmit symbols, wherein the pre-coding comprises generating the four transmit symbols by mapping M information bits as two sets of M/2 bits, wherein the first set of M/2 bits is mapped on a first and a third mapping constellation to produce first and third transmit symbols, wherein the third mapping constellation is a different permutation mapping of the first set of M/2 bits;
encoding two of the transmit symbols into a first matrix and encoding another two of the transmit symbols into a second matrix;
transmitting the two matrices on four antennas over four time intervals or four frequencies by:
transmitting the first matrix on two antennas during two of the four time intervals or at two of the four frequencies;
transmitting the second matrix on the other two antennas during the other two of the four time intervals or at the other two of the four frequencies;
wherein the pre-coding and encoding are such that all of the information bits are represented in what is transmitted from each of the four antennas.
2. The method of claim 1, wherein:
the second set of M/2 bits is mapped on a second and a fourth mapping constellation to produce second and fourth transmit symbols.
3. The method of claim 2, wherein the first and second transmit symbols are encoded in the first matrix and the third and fourth transmit symbols are encoded in the second matrix.
4. The method of claim 2, wherein the second and fourth mapping constellations are the same as the first and third mapping constellations, respectively.
5. The method of claim 1, wherein the transmitting the two matrices over the four time intervals comprises transmitting in a diversity order.
6. The method of claim 1, wherein the two matrices are located within a space time block code (�STBC�).
7. The method of claim 6, wherein remaining positions of the STBC are set to null.
8. A processor configured to:
pre-code information bits to generate four transmit symbols, wherein the pre-coding comprises generating the four transmit symbols by mapping M information bits as two sets of M/2 bits, wherein the first set of M/2 bits is mapped on a first and a third mapping constellation to produce first and third transmit symbols, wherein the third mapping constellation is a different permutation mapping of the first set of M/2 bits;
encode two of the transmit symbols into a first matrix
encode another two of the transmit symbols into a second matrix;
transmit the two matrices on four antennas over four time intervals or four frequencies by:
transmitting the first matrix on two antennas during two of the four time intervals or at two of the four frequencies;
transmitting the second matrix on the other two antennas during the other two of the four time intervals or at the other two of the four frequencies; wherein the pre-code and encode occur such that all of the information bits are represented in what is transmitted from each of the four antennas.
9. The processor of claim 8, wherein
the second set of M/2 bits is mapped on a second and a fourth mapping constellation to produce second and fourth transmit symbols.
10. The processor of claim 9, wherein the first and second transmit symbols are encoded in the first matrix and the third and fourth transmit symbols are encoded in the second matrix.
11. The processor of claim 9, wherein the second and fourth mapping constellations are the same as the first and third mapping constellations, respectively.
12. The processor of claim 8, wherein the transmitting the two matrices over the four time intervals comprises the processing hardware being configured to transmit in a diversity order.
13. The processor of claim 8, wherein the two matrices are located within a space time block code (�STBC�).
14. The processor of claim 13, wherein remaining positions of the STBC are set to null.
15. A device, comprising:
four antennas;
communication circuitry; and
processing hardware coupled to the four antennas and the communication circuitry, wherein the processing hardware is configured to operate with the four antennas and the communication circuitry to:
pre-code information bits to generate four transmit symbols, wherein the pre-coding comprises generating the four transmit symbols by mapping M information bits as two sets of M/2 bits, wherein the first set of M/2 bits is mapped on a first and a third mapping constellation to produce first and third transmit symbols, wherein the third mapping constellation is a different permutation mapping of the first set of M/2 bits;
encode two of the transmit symbols into a first matrix and encode another two of the transmit symbols into a second matrix;
transmit the two matrices on the four antennas over four time intervals or four frequencies by:
transmitting the first matrix on two antennas during two of the four time intervals or at two of the four frequencies;
transmitting the second matrix on the other two antennas during the other two of the four time intervals or at the other two of the four frequencies; wherein the pre-code and encode occur such that all of the information bits are represented in what is transmitted from each of the four antennas.
16. The device of claim 15, wherein
the second set of M/2 bits is mapped on a second and a fourth mapping constellation to produce second and fourth transmit symbols.
17. The device of claim 16, wherein the first and second transmit symbols are encoded in the first matrix and the third and fourth transmit symbols are encoded in the second matrix.
18. The device of claim 16, wherein the second and fourth mapping constellations are the same as the first and third mapping constellations, respectively.
19. The device of claim 15, wherein the two matrices are located within a space time block code (�STBC�).
20. The device of claim 19, wherein remaining positions of the STBC are set to null.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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