Interference canceller equipment and interference cancelling method for use in a multibeam-antenna communication system
First Claim
1. Multistage interference canceller equipment for eliminating interference between user channels for each signal beam by subtracting interference replica signals from input signals, the equipment comprising:
- an interference canceller section provided for each of input signal beams in each stage of the equipment and including a replica signal generator and an interference removal section coupled to said replica signal generator,wherein said replica signal generator includes means for generating a first interference replica signal from an input beam signal to produce a first error signal, andsaid interference removal section receives from another replica signal generator provided for another signal beam a second interference replica signal which is multiplied by conversion coefficients and subtracts an obtained multiplied second interference replica signal from said first interference replica signal outputted from said replica signal generator to eliminate interference by said another signal beam and produce a second error signal and output said second error signal to a replica signal generator of the next stage.
1 Assignment
0 Petitions
Accused Products
Abstract
A multistage interference canceller equipment and interference canceller method for use, for example, in CDMA (Code Division Multiple Access) multibeam-antenna communication system includes in each stage an interference canceller unit which has a replica signal generator which generates from an input beam signal a first interference replica signal and outputs a first error signal, and an interference removal unit which receives from another replica signal generator a second interference replica signal, multiplies that second interference replica signal by conversion coefficients and subtracts an obtained signal from the first interference replica signal to produce a second error signal so that an error signal is generated for each signal beam from the interference replica signals of a local signal beam and other signal beams to eliminate interference.
88 Citations
14 Claims
-
1. Multistage interference canceller equipment for eliminating interference between user channels for each signal beam by subtracting interference replica signals from input signals, the equipment comprising:
-
an interference canceller section provided for each of input signal beams in each stage of the equipment and including a replica signal generator and an interference removal section coupled to said replica signal generator, wherein said replica signal generator includes means for generating a first interference replica signal from an input beam signal to produce a first error signal, and said interference removal section receives from another replica signal generator provided for another signal beam a second interference replica signal which is multiplied by conversion coefficients and subtracts an obtained multiplied second interference replica signal from said first interference replica signal outputted from said replica signal generator to eliminate interference by said another signal beam and produce a second error signal and output said second error signal to a replica signal generator of the next stage. - View Dependent Claims (2, 3, 10, 11, 12)
-
-
4. Interference canceller equipment comprising:
-
a first stage including a first interference canceller section provided for each beam to generate a first error signal and a symbol replica signal from an input multiple beam signal; a second stage including a second interference canceller section provided for each first interference canceller to generate a second error signal and a symbol replica signal from the first error signal and the symbol replica signal of the first stage; wherein said first interference canceller section includes a first replica signal generator to generate an interference replica signal from an input beam signal, and a first interference removal section to subtract a second interference replica signal receiving a first replica signal generator for another beam signal and multiplied by conversion coefficients, from the first interference replica signal received from said first replica signal generator to produce the first error signal and output the first error signal to a replica signal generator of the next stage, wherein said second interference canceller section includes a replica signal generator to generate an interference replica signal from said first error signal outputted from said first stage and a second interference removal section to subtract a second interference replica signal received from the second replica signal generator for another beam signal and multiplied by conversion coefficients, from the first interference replica signal from said second replica signal generator to produce a second error signal and output the second error signal to the replica signal generator of the next stage. - View Dependent Claims (5, 6)
-
-
7. A multibeam interference cancellation method for eliminating interference between channel users by subtracting interference replica signals from an input signal, the method comprising the steps of:
-
generating interference replica signals and symbol replica signals from first error signals and symbol replica signals input for each of multiple beams; and multiplying an interference replica signal for one of the multiple beams and interference replica signals for other beams by conversion coefficients and subtracting the multiplied interference replica signal from the first error signal to generate a second error signal to input said second error signal to the next stage of multibeam interference cancellation. - View Dependent Claims (8, 9)
-
-
13. Multistage interference canceller equipment for eliminating interference between user channels for each signal beam in a multibeam antenna communication system by subtracting interference replica signals from input signals, the equipment comprising:
-
a beam former, coupled to a plurality of antennas of the multibeam communication system, for converting signals received by said antennas into signal beams; an interference canceller section provided for each of input signal beams in each stage of the equipment and including a replica signal generator and an interference removal section coupled to said replica signal generator, said interference canceller section receiving a corresponding signal beam from said beam former, wherein said replica signal generator includes means for generating a first interference replica signal from an input beam signal to produce a first error signal, and said interference removal section receives from another replica signal generator provided for another signal beam a second interference replica signal which is multiplied by conversion coefficients and subtracts an obtained multiplied second interference replica signal from said first interference replica signal outputted from said replica signal generator to eliminate interference by said another signal beam and produce a second error signal and output said second error signal to a replica signal generator of the next stage.
-
-
14. Interference canceller equipment for eliminating interference between user channels for each signal beam of a plurality of signal beams by subtracting interference replica signals from input signals, the equipment comprising:
-
an interference canceller section provided for each input signal beam of said plurality of input signal beams and including a replica signal generator and an interference removal section coupled to said replica signal generator, wherein said replica signal generation includes means for generating a first interference replica signal from an input beam signal to produce a first error signal, and said interference removal section receives from another replica signal generator provided for another signal beam a second interference replica signal which is multiplied by conversion coefficients and subtracts an obtained multiplied second interference replica signal from said first interference replica signal outputted from said replica signal generator to eliminate interference by said another signal beam and produce a second error signal and output said second error signal.
-
Specification