Method and apparatus for pilot communication in a multi-antenna wireless communication system
First Claim
1. A method of performing pilot communication in a wireless communication environment, comprising:
- transmitting a code-division multiplexed (CDM) waveform that is continuous from at least one antenna at a base station; and
transmitting a second waveform comprising pilot information related to the CDM waveform from at least one other antenna at the base station;
wherein the second waveform comprises an OFDM waveform, and the pilot information in the second waveform temporally overlaps one of traffic channel information and control channel information in the CDM waveform.
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Accused Products
Abstract
Systems and methodologies are described that facilitate improved pilot information to MIMO user devices without increasing interference of SISO user devices in a wireless communication environment. A data communication signal can be generated and transmitted at a first power level, and a continuous pilot waveform comprising pilot information related to the data signal can be generated and sent at a second power level below the first transmission power level. Alternatively, a discontinuous pilot waveform can be generated so that it does not overlap with pilot segments in the first waveform, and can be transmitted at the first power level without interfering with the first waveform as received by a SISO user device. A MIMO user device can receive both waveforms, and can employ the pilot waveform to better estimate a MIMO channel for the first waveform.
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Citations
45 Claims
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1. A method of performing pilot communication in a wireless communication environment, comprising:
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transmitting a code-division multiplexed (CDM) waveform that is continuous from at least one antenna at a base station; and transmitting a second waveform comprising pilot information related to the CDM waveform from at least one other antenna at the base station; wherein the second waveform comprises an OFDM waveform, and the pilot information in the second waveform temporally overlaps one of traffic channel information and control channel information in the CDM waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for wireless communication with a SISO user device having a single antenna and a MIMO user device having a plurality of antennas, comprising:
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a plurality of antennas, wherein one of said antennas provides all wireless signaling used by the SISO user device to recover communication information sent by said apparatus to the SISO user device; and a processor, coupled to the plurality of antennas and configured to transmit a CDM waveform from said one antenna for the SISO user device and the MIMO user device, said CDM waveform comprising OFDM pilot segments, said processor further configured to transmit a second waveform comprising pilot information related to the CDM waveform from at least one other of said plurality of antennas for the MIMO user device. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A wireless communication apparatus for communication with first and second wireless communication devices, comprising:
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means for generating a CDM waveform comprising OFDM pilot segments; means for generating an OFDM pilot waveform; and means for transmitting the CDM waveform from an antenna that provides all wireless signaling used by the first device to recover communication information sent by said wireless communication apparatus to the first device, and for transmitting the OFDM pilot waveform from at least one other antenna for reception at the second device. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A computer-readable medium having stored thereon computer-executable instructions for supporting operations of a wireless communication apparatus that communicates with first and second wireless communication devices, said operations comprising:
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generating a CDM waveform comprising OFDM pilot segments; generating an OFDM pilot waveform comprising pilot information related to the CDM waveform; and transmitting the CDM waveform from an antenna that provides all wireless signaling used by the first device to recover communication information sent by said wireless communication apparatus to the first device, and concurrently transmitting the OFDM waveform from at least one other antenna for reception at the second device. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A processor that executes instructions that support operations of a wireless communication apparatus that communicates with first and second wireless communication devices, the operations comprising:
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generating a CDM waveform that has OFDM pilot segments; generating an OFDM pilot waveform that has pilot information related to the CDM waveform; and transmitting the CDM waveform from an antenna that provides all wireless signaling used by the first device to recover communication information sent by said wireless communication apparatus to the first device, and transmitting the OFDM pilot waveform from at least one other antenna for reception at the second device. - View Dependent Claims (41, 42, 43, 44, 45)
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Specification