A new method of suppressing ISI for indoor wireless communications

This paper presents a new method of suppressing intersymbol interference (ISI) for indoor wireless communications in Rayleigh fading channels. In this system, we introduce a 16-ary quadrature amplitude modulation (16QAM) digital model which is spread spectrum with orthogonal Hadamard matrix row vector inserted zeros. This method not only can reduce the ISI resulting from multipath fading channels, but also can lower the peak to average-power ratio (PAPR) problem. On the other hand, the least square (LS) channel estimator has been introduced in order to achieve a better performance. Furthermore, the system performance has been analyzed and computer simulated.