Suboptimal soft-output MAP detector with lattice reduction

The use of lattice reduction (LR) has been shown to be a very effective method for signal detection in multiple antenna systems. In this letter, the performance of the suboptimal soft-output maximum a posteriori (MAP) detector with lattice reduction is studied. We propose two polynomial-time methods for flat fading channels to generate the desired size candidate list in the reduced lattice. The suboptimal soft-output MAP detector with these list generation methods provides a near-optimal performance in uncorrelated multiple-input multiple-output systems but with significantly reduced computational complexity.