Receiver with Multi Layer Interference Cancellation
First Claim
1. A multi user receiver configured to receive a signal comprising multiple symbol streams assigned to various users, wherein the multiple symbol streams include at least one first symbol stream assigned to a user of the multi user receiver and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the at least one second symbol stream is unknown at the multi user receiver, the multi user receiver comprising:
- a symbol stream election unit configured to elect a symbol stream of the multiple symbol streams;
an equalizer configured to provide an equalized symbol of the elected symbol stream; and
a detector configured to generate a detected symbol from the equalized symbol based on a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets.
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Accused Products
Abstract
A multi user receiver configured to receive a signal including multiple symbol streams assigned to various users is described. The multiple symbol streams include at least one first symbol stream assigned to a user of the multi user receiver and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the at least one second symbol stream is unknown at the multi user receiver. The multi user receiver includes a symbol stream election unit configured to elect a symbol stream of the multiple symbol streams, an equalizer configured to provide an equalized symbol of the elected symbol stream, and a detector configured to generate a detected symbol from the equalized symbol on the basis of a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation including constellation points of at least two of multiple predefined modulation alphabets.
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Citations
25 Claims
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1. A multi user receiver configured to receive a signal comprising multiple symbol streams assigned to various users, wherein the multiple symbol streams include at least one first symbol stream assigned to a user of the multi user receiver and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the at least one second symbol stream is unknown at the multi user receiver, the multi user receiver comprising:
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a symbol stream election unit configured to elect a symbol stream of the multiple symbol streams; an equalizer configured to provide an equalized symbol of the elected symbol stream; and a detector configured to generate a detected symbol from the equalized symbol based on a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi layer multi user successive interference cancellation (SIC) receiver, comprising:
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an equalizer configured to provide equalized symbols of own layers and interference layers; and a detector configured to generate detected symbols from corresponding equalized symbols, wherein detected symbols of interference layers are detected based on a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets. - View Dependent Claims (12)
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13. A method of detecting a received signal comprising multiple symbol streams including at least one first symbol stream assigned to a user of interest and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the second symbol stream is unknown, the method comprising:
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electing one of the first symbol stream and the second symbol stream; equalizing the received signal to provide an equalized symbol of the elected symbol stream; and generating a detected symbol from the equalized symbol based on a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets. - View Dependent Claims (14, 15, 16, 17)
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18. A method of detecting a received signal comprising multiple symbol streams including at least one first symbol stream assigned to a user of interest and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the second symbol stream is unknown, the method comprising:
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electing one of the first symbol stream and the second symbol stream; equalizing the received signal to provide an equalized symbol of the elected symbol stream; generating a detected symbol from the equalized symbol; and computing a quantization error of the detected symbol, wherein, if the elected symbol stream is the second symbol stream, the quantization error is based on a-priori symbol selection probabilities of multiple predefined modulation alphabets. - View Dependent Claims (19, 20, 21)
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22. A multi user receiver of a user of interest, comprising:
a successive interference cancellation (SIC) receiver comprising a symbol stream election unit configured to elect an interference symbol stream assigned to another user; an equalizer configured to provide equalized symbols of the interference symbol stream; a symbol detector configured to generate detected symbols of the interference symbol stream from the equalized symbols, wherein detected symbols of the interference symbol stream are detected based on a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets; and a maximum likelihood receiver configured to generate detected symbols of one or more symbol streams assigned to the user of interest. - View Dependent Claims (23)
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24. A method of detecting a received signal comprising multiple symbol streams by a user of interest, the method comprising:
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electing an interference symbol stream assigned to another user; equalizing the received signal to provide an equalized symbol of the elected interference symbol stream; generating a detected symbol of the interference symbol stream from the equalized symbol, wherein the detected symbol of the interference symbol stream is detected based on a mixed constellation comprising constellation points of at least two of multiple predefined modulation alphabets; and generating a detected symbol of a symbol stream assigned to the user of interest by using a maximum likelihood detection scheme. - View Dependent Claims (25)
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Specification