Continuous beamforming for a MIMO-OFDM system
First Claim
1. A method of transmitting data in a multiple-input multiple-output (MIMO) communication system, comprising:
- performing spatial processing on data symbols for each of a plurality of frequency subbands to obtain spatially processed symbols for the frequency subband; and
performing beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas.
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Abstract
A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.
211 Citations
72 Claims
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1. A method of transmitting data in a multiple-input multiple-output (MIMO) communication system, comprising:
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performing spatial processing on data symbols for each of a plurality of frequency subbands to obtain spatially processed symbols for the frequency subband; and performing beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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a spatial processor to perform spatial processing on data symbols for each of a plurality of frequency subbands and provide spatially processed symbols for the frequency subband; and a beamformer to perform beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for performing spatial processing on data symbols for each of a plurality of frequency subbands to obtain spatially processed symbols for the frequency subband; and means for performing beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. A method of receiving data in a multiple-input multiple-output (MIMO) communication system, comprising:
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deriving a spatial filter matrix for each of a plurality of frequency subbands, the spatial filter matrix for each frequency subband including effects of spatial processing and beamforming performed on data symbols sent on the frequency subband; and performing spatial processing on received symbols obtained from a plurality of antennas for each subband with the spatial filter matrix for the subband to obtain detected data symbols for the subband. - View Dependent Claims (42, 43, 44)
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45. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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a controller to derive a spatial filter matrix for each of a plurality of frequency subbands, the spatial filter matrix for each frequency subband including effects of spatial processing and beamforming performed on data symbols sent on the frequency subband; and a spatial processor to perform spatial processing on received symbols obtained from a plurality of antennas for each subband with the spatial filter matrix for the subband to obtain detected data symbols for the subband. - View Dependent Claims (46)
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47. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for deriving a spatial filter matrix for each of a plurality of frequency subbands, the spatial filter matrix for each frequency subband including effects of spatial processing and beamforming performed on data symbols sent on the frequency subband; and means for performing spatial processing on received symbols obtained from a plurality of antennas for each subband with the spatial filter matrix for the subband to obtain detected data symbols for the subband. - View Dependent Claims (48)
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49. A memory unit having software codes stored thereon, the software codes executable by a processor for performing a method, the software codes comprising:
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software codes for performing spatial processing on data symbols for each of a plurality of frequency subbands to obtain spatially processed symbols for the frequency subband; and software codes for performing beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A processor configured to execute instructions, the instructions comprising:
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instructions to perform spatial processing on data symbols for each of a plurality of frequency subbands to obtain spatially processed symbols for the frequency subband; and instructions to perform beamforming on the spatially processed symbols for the plurality of frequency subbands prior to transmission from a plurality of antennas. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification