Communication system employing channel estimation loop-back signals
First Claim
1. A method of providing a wireless communication network with downlink propagation channel information, the method comprising:
- receiving a first signal at a wireless device transmitted from a network transmitter through a downlink propagation channel;
determining a channel estimate for the downlink propagation channel at said wireless device based on receiving said first signal;
transmitting said channel estimate from said wireless device to a network receiver within the wireless communication network.
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Accused Products
Abstract
Transmit signal loop-back by a wireless receiver permits a transmitting network to estimate the characteristics of downlink propagation channels between one or more network transmitters and the receiver based on the loop-back signals. Downlink channel estimates may be, for example, used by the network in transmit pre-filtering. With transmit pre-filtering, transmit signals are compensated before transmission for the effects of the downlink propagation channels to, for example, reduce interference between multiple information signals being simultaneously transmitted to a number of wireless receivers. Loop-back techniques include but are not limited to the involved wireless receivers looping back at least a portion of the signal received from the transmitting network, which may then be processed by the network to estimate downlink channels. In some cases, the receivers may estimate downlink channels and provide these estimates to the network.
39 Citations
35 Claims
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1. A method of providing a wireless communication network with downlink propagation channel information, the method comprising:
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receiving a first signal at a wireless device transmitted from a network transmitter through a downlink propagation channel;
determining a channel estimate for the downlink propagation channel at said wireless device based on receiving said first signal;
transmitting said channel estimate from said wireless device to a network receiver within the wireless communication network. - View Dependent Claims (2, 3, 4)
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5. A method of generating a channel estimate for a downlink propagation channel in a wireless communication network, the method comprising:
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transmitting a first signal from said network to a wireless device through the downlink propagation channel;
receiving a second signal at said network from the wireless device comprising channel estimate information derived from the first signal for the downlink propagation channel; and
setting a channel estimate in said network for the downlink propagation channel based on the channel estimate information. - View Dependent Claims (6, 7)
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8. A method of generating a channel estimate for a downlink propagation channel in a wireless communication network, the method comprising:
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receiving a first signal at a wireless device transmitted from a network transmitter through one or more downlink propagation channels;
generating a loop-back signal at the wireless device comprising at least a portion of the first signal; and
transmitting the loop-back signal from the wireless device to a network receiver associated with the wireless communication network, wherein the first signal is known by the network, such that the loop-back signal may be used by the network to estimate the downlink propagation channel. - View Dependent Claims (9, 10, 11, 12)
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13. A method of generating a channel estimate for a downlink propagation channel in a wireless communication network, the method comprising:
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transmitting a first signal to a wireless device through the downlink propagation channel;
receiving a loop-back signal from the wireless device at a network receiver associated with the wireless communication network, said loop-back signal comprising at least a portion of the first signal; and
generating a channel estimate for the downlink propagation channel based on said loop-back signal from the wireless device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of providing a wireless communication network with downlink propagation channel information, the method comprising:
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receiving first signals transmitted by the network as a composite received signal, said first signals combining at said wireless device to provide wanted information to the wireless device while canceling unwanted information intended for other wireless devices;
determining an amount of interference at said wireless device associated with the unwanted information arising from imperfect cancellation of the unwanted information; and
transmitting interference information back to the wireless communication network, wherein said interference information indicates network-based downlink channel estimation error to the network. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method of generating channel estimates for downlink propagation channels in a wireless communication network, the method comprising:
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transmitting first signals from network transmitters to a plurality of wireless devices, such that said first signals combine at each said wireless device to cancel unwanted information signals for other ones of said plurality of wireless devices;
receiving unwanted signal interference measurements from said plurality of wireless devices; and
updating said channel estimates of downlink propagation channels used by said network in generating said first signals based on said unwanted signal interference measurements, such that unwanted signal interference is reduced at said plurality of wireless devices. - View Dependent Claims (29, 30, 31)
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32. A mobile terminal comprising:
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a receiver to generate a received information signal based on receiving a radio signal from a remote transmitter in a wireless network;
a transmitter to generate a transmit signal for transmission to a remote receiver in said wireless network based on processing a transmit information signal;
a combiner to form said transmit information signal based at least in part on said received information signal, such that said transmit signal from said mobile terminal functions as a loop-back signal for said wireless network. - View Dependent Claims (33, 34, 35)
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Specification