Interference mitigation in wireless communications by training of interfering signals
First Claim
1. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
- a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal, wherein said separability condition comprises providing a zero tone in said desired signal; and
c) identifying said undesired signal at said multiple input receive unit using said separability condition.
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Accused Products
Abstract
A method and wireless communication system for identifying one or more undesired signals at a multiple input receive unit receiving a desired signal or several desired signals and the undesired signal or signals. A separability condition between the desired signal and undesired signal is provided to enable that the undesired signal can be identified at the multiple input receive unit. The separability condition includes the use of substantially coherent reception at the receive unit and the use of separable training patterns for the desired and undesired signals. Zero tones are included in desired and undesired signals to further enhance signal separability. Signal training at the receive unit is used to derive the corresponding channel matrices for the interferers and mitigate their effects.
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Citations
34 Claims
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1. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal, wherein said separability condition comprises providing a zero tone in said desired signal; and
c) identifying said undesired signal at said multiple input receive unit using said separability condition. - View Dependent Claims (2)
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3. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal;
wherein providing said separability condition comprises providing said desired signal with an initial training pattern and providing a zero tone in said undesired signal substantially at said initial training pattern; and
c) identifying said undesired signal at said multiple input receive unit using said separability condition.
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4. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal; and
c) identifying said undesired signal at said multiple input receive unit using said separability condition;
wherein providing said separability condition comprises;
providing said desired signal with an initial training pattern; and
providing said undesired signal with a first training pattern separable from said initial training pattern at said multiple input receive unit;
wherein said initial training pattern and said first training pattern are linearly independent at said multiple input receive unit.- View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal, wherein providing said separability condition comprises transmission of said desired signal and said undesired signal, such that said desired signal and said undesired signal are received in substantial coherence at said multiple input receive unit; and
c) identifying said undesired signal at said multiple input receive unit using said separability condition.
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12. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) receiving at said multiple input receive unit a desired signal and an undesired signal;
b) providing a separability condition between said desired signal and said undesired signal;
c) identifying said undesired signal at said multiple input receive unit using said separability condition;
d) receiving at said multiple input receive unit a second undesired signal;
e) providing a second separability condition between said desired signal and said second undesired signal; and
f) identifying said second undesired signal at said multiple input receive unit using said second separability condition. - View Dependent Claims (13, 14, 15, 16, 17)
a) providing said desired signal with an initial training pattern; and
b) providing said second undesired signal with a second training pattern separable from said initial training pattern at said multiple input receive unit.
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14. The method of claim 13, wherein said second training pattern is used for determining a channel matrix for said second undesired signal.
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15. The method of claim 13, wherein said initial training pattern and said second training pattern are transmitted at a boosted power level.
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16. The method of claim 12, wherein said step of providing said second separability condition comprises transmission of said desired signal and said second undesired signal, such that said desired signal and said second undesired signal are received in substantial coherence at said multiple input receive unit.
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17. The method of claim 12, wherein said second undesired signal is a weak interfering signal and said undesired signal is a strong interfering signal.
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18. A method for training undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) providing a desired signal with an initial training pattern;
b) providing an undesired signal with a first training pattern separable from said initial training pattern at said multiple input receive unit, wherein said initial training pattern and said first training pattern are linearly independent at said multiple input receive unit; and
c) training said undesired signal using said first training pattern. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
a) providing a second undesired signal with a second training pattern separable from said initial training pattern at said multiple input receive unit; and
b) training said second undesired signal using said second training pattern.
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27. The method of claim 26, further comprising transmitting said second undesired signal such that said second training pattern is received substantially coherently with said initial training pattern by said multiple input receive unit.
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28. The method of claim 26, wherein said second undesired signal is a weak interfering signal and said first undesired signal is a strong interfering signal.
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29. The method of claim 18, wherein said initial training pattern is transmitted at an initial carrier frequency fk and said first training pattern is transmitted at an offset carrier frequency proximate said initial carrier frequency fk.
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30. The method of claim 29, wherein said wireless communication system is an OFDM wireless communication system and said offset carrier frequency is fk±
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31. The method of claim 29, wherein said initial carrier frequency fk and said offset carrier frequency are randomly assigned.
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32. The method of claim 18, further comprising canceling said undesired signal by said multiple input receive unit.
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33. A method for identifying undesired signals at a multiple input receive unit in a wireless communication system, said method comprising:
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a) providing a desired signal with a zero tone;
b) receiving at said multiple input receive unit said desired signal and an undesired signal;
c) identifying said undesired signal at said multiple input receive unit using said zero tone. - View Dependent Claims (34)
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Specification