In this chapter, linear JD techniques were presented as an application of STAP in the field of mobile radio communications. STAP was performed on the UL of a cellular SD/TD/CDMA system by adaptively equalising the multiuser system channel matrix, which contains the spatio-temporal channel impulse responses between all transmitting MS and the receiving BS antenna array and the code signatures of the MS. Perfect channel state information at the receiver was assumed, whereas in real-world systems blind/semi-blind/non-blind tracking of the spatio-temporal channel impulse responses has to be performed on a time slot basis. The same holds for the estimation of the spatial ICI covariance matrix. In particular, trade-off between deploying the available DoF in the space and code domain for exploitation of spatial and frequency diversity (to reduce fading) or for intra- and intercell interference cancellation (to create spatial transmission channels) was examined.