Blind multiuser detector based on orthogonal projection

A new stable blind multiuser detector based on signal subspace orthogonal p rojection is presented. By carrying out a pseudo-eigendecomposition (PED) a nalysis, a technique proposed for the first rime, the signal of the interes ted user can be approximated by the orthogonal projection of a received mul tiuser signal onto the related subspace of the interested user. Simulations show that compared with the previous subspace-based MMSE blind multiuser d etector, the new detector offers better performance without leading to an i ncrease in the computational complexity.