Improved lattice-reduction-aided detectors over added search signals using quantization error for MIMO-OFDM systems

This paper describes approaches to the problem that lattice-reduction-aided (LRA) detectors have non-ideal decision region and detect outlying constellation points. The proposed approaches find the shortest distance from a received signal to added search signals using quantization error. Using these approaches, we can improve a bit error (BER) performance with a low complexity compared to full search maximum-likelihood (ML) detection.