Method and device for interference cancellation in a CDMA wireless communication system
First Claim
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1. Method of interference cancellation in a Code Division Multiple Access (CDMA) wireless communication system the method comprising the steps of:
- receiving an incident digital signal containing a user signal transmitted on a CDMA user physical channel and an interfering signal;
projecting said incident digital signal onto a projection space orthogonal to the space containing said interfering signal; and
filtering said projected signal with a filter matched to the CDMA user physical channel for detecting the data contained in said user signal,wherein said interfering signal contains interfering information transmitted on at least one CDMA interfering physical channel,the data transmitted on each CDMA physical channel are sent burst by burst, each burst comprising N data symbols,channel coefficients and a specific code are allocated to each physical CDMA channel during each burst, andthe projecting step comprises the sub-steps of;
determining a burst interfering transmission matrix representative of said interfering signal space and containing information on channel coefficients and specific codes of all the CDMA interfering physical channels in use during said burst transmission;
determining said projection matrix from said burst interfering transmission matrix; and
multiplying said projection matrix with the N symbols of the received burst wherein N is an integer.
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Abstract
The method of interference cancellation in a CDMA wireless communication system comprises receiving an incident digital signal containing a user signal transmitted on a CDMA user physical channel and an interfering signal, projecting said incident digital signal onto a projection space orthogonal to the space containing said interfering signal, filtering said projected signal with a filter matched to the CDMA user physical channel for detecting the data contained in said user signal.
81 Citations
23 Claims
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1. Method of interference cancellation in a Code Division Multiple Access (CDMA) wireless communication system the method comprising the steps of:
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receiving an incident digital signal containing a user signal transmitted on a CDMA user physical channel and an interfering signal; projecting said incident digital signal onto a projection space orthogonal to the space containing said interfering signal; and filtering said projected signal with a filter matched to the CDMA user physical channel for detecting the data contained in said user signal, wherein said interfering signal contains interfering information transmitted on at least one CDMA interfering physical channel, the data transmitted on each CDMA physical channel are sent burst by burst, each burst comprising N data symbols, channel coefficients and a specific code are allocated to each physical CDMA channel during each burst, and the projecting step comprises the sub-steps of; determining a burst interfering transmission matrix representative of said interfering signal space and containing information on channel coefficients and specific codes of all the CDMA interfering physical channels in use during said burst transmission; determining said projection matrix from said burst interfering transmission matrix; and multiplying said projection matrix with the N symbols of the received burst wherein N is an integer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Interference cancellation device for a Code Division Multiple Access (CDMA) wireless communication system the device comprising:
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reception means for receiving an incident digital signal containing a user signal transmitted on a CDMA user physical channel and an interfering signal; preprocessing means for projecting said incident digital signal onto a projection space orthogonal to the space containing said interfering signal; and a Rake receiver connected to the output of the preprocessing means, and matched to the CDMA user physical channel for detecting the data contained in said user signal, wherein said interfering signal contains interfering information transmitted on at least one CDMA interfering physical channel, the data transmitted on each CDMA physical channel are sent burst by burst, each burst comprising N data symbols, channel coefficients and a specific code are allocated to each physical CDMA channel during each burst, and the preprocessing means comprises; first calculation means for determining a burst interfering transmission matrix representative of said interfering signal space and containing information on channel coefficients and specific codes of all the CDMA interfering physical channels in use during said burst transmission; second calculation means for determining said projection matrix from said burst interfering transmission matrix; and multiplication means for multiplying said projection matrix with the N symbols of the received burst wherein N is an integer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification