Patent ID: 7099377

Claim:
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, 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.