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 | 10/06/2008 | ISLD-200807-005 | NORTEL NETWORKS LIMITED | No | Family Member | ||||
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No | Family Member | |||
4G | 02/11/2017 | ISLD-201801-001 | APPLE INC |
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4G | 02/11/2017 | ISLD-201801-001 | APPLE INC | Yes | Basis Patent | ||||
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Specification Information
Specification Information
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Technologies
Product
Use Cases
Services
Claim
1. A method of transmitting over three antennas comprising:
for each of the three antennas, generating a respective sequence of OFDM symbols; and
transmitting the respective sequence of OFDM symbols,
wherein the respective sequence of OFDM symbols comprises
a plurality of the OFDM symbols having a plurality of OFDM sub-carriers carrying data;
at least one pilot of a first antenna of the three antennas that is adjacent in one of time or frequency to a pilot of a second antenna of the three antennas; and
the at least one pilot of the first antenna of the three antennas is adjacent in the other of the time or frequency to a pilot of a third antenna of the three antennas; and
grouping pilots for the three antennas collectively in groups of pilots, each of the groups of pilots containing the pilot associated with the first antenna, the pilot of the second antenna, and the pilot of the third antenna, the groups of pilots are scattered in time and frequency.
2. The method of claim 1, wherein each group of pilots comprises a first and a second pilot on a first OFDM sub-carrier, the first and second pilot are over two time intervals and a third pilot on an adjacent OFDM sub-carrier located in the same time intervals as the first and second pilot on the first OFDM sub-carrier.
3. The method of claim 1, wherein the method comprises:
transmitting a rate=2 space-time block code over the three antennas, comprising:
for each pair of transmission intervals:
on each OFDM sub-carrier of the plurality of OFDM sub-carriers, transmitting one code set containing four transmit symbols on the three antennas to result in transmission of the rate=2 space-time block code, such that all of the plurality of OFDM sub-carriers are used and all of the three antennas are active during a given pair of transmission intervals for a given OFDM sub-carrier.
4. The method of claim 3, wherein the transmitting of the one code set comprises transmitting an orthogonal space time/frequency code block including two transmit symbols on two antennas of the three antennas and two transmit symbols on athe third antenna.
5. The method of claim 1, wherein the method comprises
Transmitting a rate=2 space-time block code over the three antennas, comprising:
For each pair of consecutive transmission intervals:
on each OFDM sub-carrier of the plurality of OFDM sub-carriers, transmitting a respective Alamouti code block containing two transmit symbols on a respective pair of the three antennas such that all of the plurality of OFDM sub-carriers are used and only one pair of the three antennas is active during a given pair of consecutive transmission intervals for a given OFDM sub-carrier.
6. The method of claim 1, wherein said generating, said grouping pilots and said transmitting the sequence of OFDM symbols is performed by a mobile station.
7. The method of claim 1, wherein said generating, said grouping pilots and said transmitting the sequence of OFDM symbols is performed by a base station.
8. A transmitter comprising:
Three antennas; and
Processing hardware coupled to the three antennas, wherein the processing hardware is configured to:
for each of the three antennas, generating a respective sequence of OFDM symbols; and
transmit the respective sequence of OFDM symbols over the respective antenna of the three antennas,
wherein; the respective sequence of OFDM symbols comprises
a plurality of the OFDM symbols having a plurality of OFDM sub-carriers carrying data;
at least one pilot of a first antenna of the three antennas that is adjacent in tone of time or frequency to a pilot of a second antenna of the three antennas; and
the at least one pilot of the first antenna of the three antennas is adjacent in the other of the time or frequency to a pilot of a third antenna of the three antennas; and
group pilots for the three antennas collectively in groups of pilots, each of the groups of pilots containing the pilot associated with the first antenna, the pilot of the second antenna, and the pilot of the third antenna, the groups of pilots are scattered in time and frequency.
9. The transmitter of claim 8, wherein each group of pilots comprises a first and a second pilot on a first OFDM sub-carrier, the first and second pilot are over two time intervals and a third pilot on an adjacent OFDM sub-carrier located in the same time intervals as the first and second pilot on the first OFDM sub-carrier.
10. The transmitter of claim 8, transmit a rate=2 space-time block code over the three antennas, comprising:
for each pair of transmission intervals:
on each OFDM sub-carrier of the plurality of OFDM sub-carriers, transmitting one code set containing four transmit symbols on the three antennas to result in transmission of the rate=2 block code, such that all of the plurality of OFDM sub-carries are used and all of the three antennas are active during a given pair of transmission intervals for a given OFDM sub-carrier.
11. The transmitter of claim 10, wherein the transmitting of the one code set comprises transmitting an orthogonal space time/frequency code block including two transmit symbols on two of the three antennas and two transmit symbols on the third antenna.
12. The transmitter of claim 8, wherein the processing hardware is configured to:
transmit a rate=2 space-time block code over the three antennas, comprising:
for each pair of consecutive transmission intervals:
on each OFDM sub-carrier of the plurality of OFDM sub-carriers, transmitting a respective Alamouti code block containing two transmit symbols on a respective pair of the three antennas such that all of the plurality of OFDM sub-carriers are used and only one pair of the three antennas is active during a given pair of consecutive transmission intervals for a given OFDM sub-carrier.
13. The transmitter claim 8, wherein the transmitter is included in a mobile station.
14. The transmitter of claim 8, wherein the transmitter is included in a base station.
15. A transmitter comprising:
2n+1 antennas, where n>=1; and
A processing hardware coupled to the 2n+1 antennas, wherein the processing hardware is configured to transmit a rate=1 space-time block code over the 2n+1 antennas by transmitting at least one code set by:
for each pair of consecutive transmission intervals:
on each OFDM sub-carrier of a plurality of OFDM sub-carriers, transmit a respective Alamouti code block containing two transmit symbols on a respective pair of antennas of the 2n+1 antennas such that all of the plurality of OFDM sub-carriers are used and only the respective pair of antennas is active during each of the pair of consecutive transmission intervals of each of the OFDM sub-carrier of the plurality of OFDM sub-carriers.
16. The transmitter of claim 15, wherein n=3.
17. The transmitter of claim 15, wherein a mobile station comprises the transmitter.
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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.
Family member:related patents or applications that share a common priority or original filing.