Transmit diversity with formed beams in a wireless communications system using a common pilot channel
First Claim
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1. A method comprising:
- transmitting a pilot signal with a first set of spatial parameters for use as a phase reference by a remote terminal;
transmitting a first user-specific traffic signal with a second set of spatial parameters different from the first set of spatial parameters directed to the remote terminal; and
transmitting a second user-specific diversity traffic signal with a third set of spatial parameters different from the second set of spatial parameters directed to the remote terminal, the second traffic signal carrying the same traffic as the first traffic signal.
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Abstract
A method and apparatus are provided that allows beamforming to be used on a user-specific signal together with a sector-wide pilot signal in a communication system, such as a CDMA system. In one embodiment, the invention includes transmitting a pilot signal with a wide beamwidth to a remote terminal from a first array, transmitting a first traffic signal with a narrow beamwidth directed to the remote terminal from the first array, and transmitting a second diversity traffic signal with a second narrow beamwidth directed to the remote terminal from a second array. In some examples, the invention may also include transmitting a second pilot signal from the second antenna array.
67 Citations
39 Claims
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1. A method comprising:
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transmitting a pilot signal with a first set of spatial parameters for use as a phase reference by a remote terminal; transmitting a first user-specific traffic signal with a second set of spatial parameters different from the first set of spatial parameters directed to the remote terminal; and transmitting a second user-specific diversity traffic signal with a third set of spatial parameters different from the second set of spatial parameters directed to the remote terminal, the second traffic signal carrying the same traffic as the first traffic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A machine-readable medium having stored thereon data representing instructions which, when executed by a machine, cause the machine to perform operations comprising:
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transmitting a pilot signal with a first set of spatial parameters for use as a phase reference by a remote terminal; transmitting a first user-specific traffic signal with a second set of spatial parameters different from the first set of spatial parameters directed to the remote terminal; and transmitting a second user-specific diversity traffic signal with a third set of spatial parameters different from the second set of spatial parameters directed to the remote terminal, the second traffic signal carrying the same traffic as the first traffic signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus comprising:
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a signal processor to generate a pilot signal for use as a phase reference by a remote terminal and a traffic signal to carry traffic to the remote terminal; and a transmit modulator to apply a first set of spatial parameters to the pilot signal, a second different set of spatial parameters to the traffic signal for a user-specific directed to the remote terminal, and a third set of spatial parameters different from the second set of spatial parameters to the traffic signal for a user-specific diversity traffic signal directed to the remote terminal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method comprising:
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receiving at a remote terminal a pilot signal with a first set of spatial parameters for use as a phase reference; receiving at the remote terminal a first user-specific traffic signal directed to the remote terminal with a second set of spatial parameters different from the first set of spatial parameters; and receiving at the remote terminal a second user-specific diversity traffic signal directed to the remote terminal with a third set of spatial parameters different from the second set of spatial parameters, the second traffic signal carrying the same traffic as the first traffic signal. - View Dependent Claims (36, 37, 38, 39)
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Specification