System and method for communicating reference signals
First Claim
Patent Images
1. A method of communicating reference signal symbols, the method comprising:
- communicating, by a wirelessly enabled device, a first subframe in a channel, the first subframe carrying a first set of symbols of a first spreading code sequence and a first set of symbols of a second spreading code sequence; and
communicating a second subframe in a channel, the second subframe carrying a second set of symbols of the first spreading code and a second set of symbols of the second spreading code sequence, wherein the first set of symbols of the first spreading code sequence are excluded from the second subframe and the second set of symbols of the first spreading code sequence are excluded from the first subframe.
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Abstract
A method for communicating DM-RS symbols to support MIMO transmissions having five or more layers of spatial multiplexing. A first subframe is communicated carrying two leading symbols of a first length-4 OCC sequence and two leading symbols of a second length-4 OCC sequence, and a second subframe is communicated carrying two trailing symbols of the first length-4 OCC and two trailing symbols of the second length-4 OCC sequence. Optionally four length-2 OCCs can be carried in a similar manner or, alternatively, in different frequency bands or resource block pairs of a common subframe.
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Citations
27 Claims
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1. A method of communicating reference signal symbols, the method comprising:
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communicating, by a wirelessly enabled device, a first subframe in a channel, the first subframe carrying a first set of symbols of a first spreading code sequence and a first set of symbols of a second spreading code sequence; and communicating a second subframe in a channel, the second subframe carrying a second set of symbols of the first spreading code and a second set of symbols of the second spreading code sequence, wherein the first set of symbols of the first spreading code sequence are excluded from the second subframe and the second set of symbols of the first spreading code sequence are excluded from the first subframe. - View Dependent Claims (2, 3, 4)
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5. An apparatus for communicating reference signal symbols, the apparatus comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; communicate a first subframe in a channel, the first subframe carrying a first set of symbols of a first spreading code sequence and a first set of symbols of a second spreading code sequence; and communicate a second subframe in a channel, the second subframe carrying a second set of symbols of the first spreading code and a second set of symbols of the second spreading code sequence, wherein the first set of symbols of the first spreading code sequence are excluded from the second subframe and the second set of symbols of the first spreading code sequence are excluded from the first subframe. - View Dependent Claims (6, 7, 8)
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9. A method of communicating reference signal symbols, the method comprising:
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communicating, by a wirelessly enabled device, a first subframe in a downlink channel, the first subframe carrying a first symbol and a second symbol of a first length-4 orthogonal cover code (OCC) sequence and a first symbol and a second symbol of a second length-4 OCC sequence; and communicating a second subframe in the downlink channel, the second subframe carrying a third symbol and a fourth symbol of the first length-4 OCC and a third symbol and a fourth symbol of the second length-4 OCC sequence, wherein the third symbol and the fourth symbol of the first length-4 OCC sequence are excluded from the first subframe, and wherein the first symbol and the second symbol of the first length-4 OCC sequence are excluded from the second subframe. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of communicating reference signal symbols, the method comprising:
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communicating, by a wirelessly enabled device, a first subframe in a downlink channel, the first subframe comprising a first resource block pair (RBP) carrying a first symbol and a second symbol of a first length-4 orthogonal cover code (OCC) sequence and a second RBP carrying a first symbol and a second symbol of a second length-4 OCC sequence, the second RBP and the first RBP spanning different frequency bands of the downlink channel, wherein the first length-4 OCC sequence and the second length-4 OCC sequence are configured to provide channel estimation for spatial multiplexing streams in the same channel. - View Dependent Claims (18)
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19. An apparatus for communicating reference signal symbols, the apparatus comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; communicate a first subframe in a downlink channel, the first subframe carrying a first symbol and a second symbol of a first length-4 orthogonal cover code (OCC) sequence; and communicate a second subframe in the downlink channel, the second subframe carrying a third symbol and a fourth symbol of the first length-4 OCC, wherein the first symbol and the second symbol of the first length-4 OCC sequence are excluded from the second subframe, and wherein the third symbol and the fourth symbol of the first length-4 OCC sequence are excluded from the first subframe. - View Dependent Claims (20, 21, 22, 23)
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24. A method of communicating reference signal symbols, the method comprising:
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communicating a first subframe in a downlink channel, the first subframe carrying a first length-2 orthogonal cover code (OCC) sequence and a second length-2 OCC sequence; and communicating a second subframe in the downlink channel, the second subframe carrying a third length-2 OCC sequence and fourth length-2 OCC sequence, wherein the first subframe comprises a first resource block pair (RBP) carrying the first length-2 OCC sequence and a second RBP carrying the second length-2 OCC sequence, wherein the second RBP and the first RBP span different frequency bands of the downlink channel, and wherein the first length-2 OCC sequence and the second length-2 OCC sequence are configured to provide channel estimation for spatial multiplexing streams in the same channel. - View Dependent Claims (25)
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26. An apparatus for communicating reference signal symbols, the apparatus comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; communicate a first subframe in a downlink channel, the first subframe carrying a first length-2 orthogonal cover code (OCC) sequence and a second length-2 OCC sequence; and communicate a second subframe in the downlink channel, the second subframe carrying a third length-2 OCC sequence and fourth length-2 OCC sequence, wherein the first subframe comprises a first resource block pair (RBP) carrying the first length-2 OCC sequence and a second RBP carrying the second length-2 OCC sequence, wherein the second RBP and the first RBP span different frequency bands of the downlink channel, and wherein the first length-2 OCC sequence and the second length-2 OCC sequence are configured to provide channel estimation for spatial multiplexing streams in the same channel.
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27. A method of communicating reference signal symbols, the method comprising:
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communicating, by a wirelessly enabled device, a first subframe in a downlink channel, the first subframe comprising; a first resource block pair (RBP) carrying a first length-2 orthogonal cover code (OCC) sequence and a second length-2 OCC sequence, wherein both the first length-2 OCC sequence and the second length-2 OCC sequence correspond to a first set of four antenna ports; and a second RBP carrying a third length-2 OCC sequence and a fourth length-2 OCC sequence, wherein both the third length-2 OCC sequence and the fourth length-2 OCC sequence correspond to a second set of four antenna ports that is different from the first set of antenna ports, wherein the first length-2 OCC sequence, the second length-2 OCC sequence, the third length-2 OCC sequence, and the fourth length-2 OCC sequence are configured to provide channel estimation for spatial multiplexing streams in the same channel, and wherein the first RBP and the second RBP span different frequency bands of the downlink channel.
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Specification