Single user multiple input multiple output user equipment
First Claim
Patent Images
1. A method comprising:
- receiving information descriptive of a type of radio access which a user equipment is acting on; and
in response to receiving the information descriptive of a particular type of radio access, transmitting from a multiple transmit antenna user equipment, where the particular type of radio access is a Rel-8/9 LTE type radio access, where the transmission is made on a physical uplink shared channel, where the transmitting further comprises cyclically delaying signals from different ones of the multiple transmit antennas, relative to a first transmit antenna, by an antenna specific delay such that the user equipment appears to a base station as having a single transmit antenna, and where the antenna specific delay determined such that the delay does not reduce coherence bandwidth of the resulting signal, when the signals from the multiple transmit antennas are combined, below a typical channel coherence bandwidth, and such that a delay spread of the transmitted signal is increased by an acceptable amount when compared to a cyclic prefix length.
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Abstract
In accordance with the exemplary embodiments of the invention there is at least a method, apparatus, and a computer program to perform operations including receiving information descriptive of a type of radio access which a user equipment is acting on, and in response to receiving the information descriptive of a particular type of radio access, transmitting from a multiple transmit antenna user equipment so that the transmission appears, at a receiver, to have been made by a single antenna user equipment, or by a user equipment that supports antenna switching/selection.
3 Citations
15 Claims
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1. A method comprising:
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receiving information descriptive of a type of radio access which a user equipment is acting on; and in response to receiving the information descriptive of a particular type of radio access, transmitting from a multiple transmit antenna user equipment, where the particular type of radio access is a Rel-8/9 LTE type radio access, where the transmission is made on a physical uplink shared channel, where the transmitting further comprises cyclically delaying signals from different ones of the multiple transmit antennas, relative to a first transmit antenna, by an antenna specific delay such that the user equipment appears to a base station as having a single transmit antenna, and where the antenna specific delay determined such that the delay does not reduce coherence bandwidth of the resulting signal, when the signals from the multiple transmit antennas are combined, below a typical channel coherence bandwidth, and such that a delay spread of the transmitted signal is increased by an acceptable amount when compared to a cyclic prefix length. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least; receive information descriptive of a type of radio access which a user equipment is acting on; and in response to receiving the information descriptive of a particular type of radio access, transmit from a multiple transmit antenna user equipment, where the particular type of radio access is a Rel-8/9 LTE type radio access, where the transmission is made on a physical uplink shared channel, and where the transmitting comprises cyclically delaying signals from different ones of the multiple transmit antennas, relative to a first transmit antenna, by an antenna specific delay such that the user equipment appears to a base station as having a single transmit antenna, and where the antenna specific delay determined such that the delay does not reduce coherence bandwidth of a resulting signal, when the signals from the multiple transmit antennas are combined, below a typical channel coherence bandwidth, and such that a delay spread of the transmitted signal is increased by an acceptable amount when compared to a cyclic prefix length. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method comprising:
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receiving information descriptive of a type of radio access which a user equipment is acting on; in response to receiving the information descriptive of a particular type of radio access, transmitting from a multiple transmit antenna user equipment so that the transmission appears, at a receiver, to have been made by a single antenna user equipment, or by a user equipment that supports antenna switching/selection; and rotating signals to individual ones of the multiple transmit antennas with an antenna-specific phase rotation, where a change in the rotation rate and sign is selected such that a coherence time/time correlation of the resulting signal, when the signals from the multiple transmit antennas are combined, corresponds to a coherence time/time correlation that would be received from a user terminal moving at a low velocity.
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15. An apparatus comprising:
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at least one processor; and at least one memory including computer program code, where the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least; receive information descriptive of a type of radio access which a user equipment is acting on; in response to receiving the information descriptive of a particular type of radio access, transmit from a multiple transmit antenna user equipment so that the transmission appears, at a receiver, to have been made by a single antenna user equipment, or by a user equipment that supports antenna switching/selection; and rotating signals to individual ones of the multiple transmit antennas with an antenna-specific phase rotation, where a change in the rotation rate and sign is selected such that a coherence time/time correlation of the resulting signal, when the signals from the multiple transmit antennas are combined, corresponds to a coherence time/time correlation that would be received from a user terminal moving at a low velocity.
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Specification