Interference Cancellation Schemes for Spread Spectrum Systems with Blind Principles
M. G. S. Sriyananda, J. Joutsensalo, Timo Hämäläinen · 2013
Employing a Blind Source Separation (BSS) algorithm is one of the mechanisms used in extracting unobserved signals from observed mixtures in signal processing. Direct Sequence - Code Division Multiple Access (DS-CDMA) is mature and prominent in spreading code assisted spread spectrum based multiple access communication techniques. Mitigation of deteriorative effects caused within the air interface of DS-CDMA is aimed by trying to remove the jamming signal. A pair of algorithms derived with the aid of BSS schemes are presented in this paper. In the short code model time correlation properties of the channel is taken advantage for BSS. Two energy functions of receive signal are used with the iterative fixed point rule in determining the filter coefficients. The methods are tested in a downlink channel. Equal Gain Combining (EGC) is used to treat the channel parameter values. They are important mechanisms due to simplicity and applicability to High Speed Packet Access (HSPA) based systems.