Method and apparatus for providing antenna diversity in a wireless communication system
First Claim
1. An apparatus comprising:
- at least one processor configured to select M virtual antennas to use for transmission from among V virtual antennas, to map output symbols to the M virtual antennas, and to provide the mapped output symbols for transmission from T transmit antennas, wherein M is equal to one or greater, V is equal to or greater than M, and T is equal to or greater than V; and
a memory coupled to the at least one processor.
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Accused Products
Abstract
Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.
345 Citations
40 Claims
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1. An apparatus comprising:
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at least one processor configured to select M virtual antennas to use for transmission from among V virtual antennas, to map output symbols to the M virtual antennas, and to provide the mapped output symbols for transmission from T transmit antennas, wherein M is equal to one or greater, V is equal to or greater than M, and T is equal to or greater than V; and
a memory coupled to the at least one processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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selecting M virtual antennas to use for transmission from among V virtual antennas, wherein M is one or greater and V is equal to or greater than M;
mapping output symbols to the M virtual antennas; and
providing the mapped output symbols for transmission from T transmit antennas, wherein T is equal to or greater than V. - View Dependent Claims (21, 22, 23)
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24. An apparatus comprising:
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means for selecting M virtual antennas to use for transmission from among V virtual antennas, wherein M is one or greater and V is equal to or greater than M;
means for mapping output symbols to the M virtual antennas; and
means for providing the mapped output symbols for transmission from T transmit antennas, wherein T is equal to or greater than V. - View Dependent Claims (25, 26, 27)
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28. An apparatus comprising:
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at least one processor configured to select M1 virtual antennas to use for transmission to a first receiver from among V virtual antennas, to select M2 virtual antennas to use for transmission to a second receiver from among the V virtual antennas, to map output symbols for the first receiver to the M1 virtual antennas, to map output symbols for the second receiver to the M2 virtual antennas, to provide the mapped output symbols for the first receiver for transmission on a first frequency subcarrier of T transmit antennas, and to provide the mapped output symbols for the second receiver for transmission on a second frequency subcarrier of the T transmit antennas, wherein M1 and M2 are each equal to one or greater, V is equal to or greater than the larger of M1 and M2, and T is equal to or greater than V; and
a memory coupled to the at least one processor. - View Dependent Claims (29, 30, 31, 32, 33)
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34. An apparatus comprising:
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means for selecting M1 virtual antennas to use for transmission to a first receiver from among V virtual antennas, wherein M1 is equal to one or greater and V is equal to or greater than M1;
means for selecting M2 virtual antennas to use for transmission to a second receiver from among the V virtual antennas, wherein M2 is equal to one or greater and is also less than or equal to V;
means for mapping output symbols for the first receiver to the M1 virtual antennas;
means for mapping output symbols for the second receiver to the M2 virtual antennas;
means for providing the mapped output symbols for the first receiver for transmission on a first frequency subcarrier of T transmit antennas, wherein T is equal to or greater than V; and
means for providing the mapped output symbols for the second receiver for transmission on a second frequency subcarrier of the T transmit antennas. - View Dependent Claims (35)
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36. An apparatus comprising:
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at least one processor configured to map output symbols to a plurality of antennas based upon at least one mapping pattern selected from among a plurality of mapping patterns, wherein each mapping pattern indicates a specific mapping of an output symbol to the plurality of antennas; and
a memory coupled to the at least one processor. - View Dependent Claims (37, 38, 39, 40)
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Specification