Method for iterative interference cancellation for co-channel multi-carrier and narrowband systems
First Claim
1. A method for canceling interference between a multicarrier signal and a narrowband signal from a received signal, comprising:
- (a) from an estimate of a narrowband signal, obtaining a regenerated narrowband signal by eliminating random noise from the estimate of the narrowband signal;
(b) obtaining the spectrum of the regenerated narrowband signal;
(c) obtaining an estimate of the spectrum of the multicarrier signal by subtracting a spectrum of the regenerated narrowband signal from a spectrum of the received signal;
(d) from the estimates of multicarrier signals, obtaining a regenerated spectrum of the multicarrier signal;
(e) obtaining a refined estimate of the narrowband signal by subtracting a time domain representation of the regenerated spectrum of the multicarrier signal from the received signal;
(f) using the refined estimate of the narrowband signal to be the estimate of the narrowband signal of step (a), repeat steps (a) to (e) for a predetermined number of iterations; and
(g) after completing the predetermined number of iterations, recovering the data from the latest regenerated spectrum of the multicarrier signal or the narrowb and signal.
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Abstract
In a co-channel deployment of narrowband and multi-carrier technologies (e.g., a femtocell and a macrocell), a method provides cancelling of interference which treats the co-channel signals as desired signals and enhances each of them iteratively. At each iteration, each signal is demodulated and regenerated based on symbol decisions already made and a predetermined channel impulse response. To estimate the other (interfering) co-channel signal, the regenerated signal is subtracted from the aggregate signal. Simulations have shown that a method of the present invention can provide fundamental improvement in the performances of both interfering systems in as few as two iterations. The fundamental performance gain that can be obtained outweigh the required computational burden.
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Citations
26 Claims
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1. A method for canceling interference between a multicarrier signal and a narrowband signal from a received signal, comprising:
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(a) from an estimate of a narrowband signal, obtaining a regenerated narrowband signal by eliminating random noise from the estimate of the narrowband signal; (b) obtaining the spectrum of the regenerated narrowband signal; (c) obtaining an estimate of the spectrum of the multicarrier signal by subtracting a spectrum of the regenerated narrowband signal from a spectrum of the received signal; (d) from the estimates of multicarrier signals, obtaining a regenerated spectrum of the multicarrier signal; (e) obtaining a refined estimate of the narrowband signal by subtracting a time domain representation of the regenerated spectrum of the multicarrier signal from the received signal; (f) using the refined estimate of the narrowband signal to be the estimate of the narrowband signal of step (a), repeat steps (a) to (e) for a predetermined number of iterations; and (g) after completing the predetermined number of iterations, recovering the data from the latest regenerated spectrum of the multicarrier signal or the narrowb and signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A mobile station, comprising:
a receiver which carries out a method for canceling interference between a multicarrier signal and a narrowband signal from a received signal, the method comprising; (a) from an estimate of a narrowband signal, obtaining a regenerated narrowband signal by eliminating random noise from the estimate of the narrowband signal; (c) obtaining an estimate of the spectrum of the multicarrier signal by subtracting a spectrum of the regenerated narrowband signal from a spectrum of the received signal; (d) obtaining a regenerated spectrum of the multicarrier signal; (e) obtaining a refined estimate of the narrowband signal by subtracting a time domain representation of the regenerated spectrum of the multicarrier signal from the received signal; (f) using the refined estimate of the narrowband signal to be the estimate of the narrowband signal of step (a), repeat steps (a) to (e) for a predetermined number of iterations; and (g) after completing the predetermined number of iterations, recovering the data from the latest regenerated spectrum of the multicarrier signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
Specification