自适应调制扩频技术

文中提出了在OFDM系统中结合自适应调制和自适应扩频,构成自适应调制扩频算法,该算法可适应大范围的信道变化。仿真结果表明:在OFDM系统中采用自适应调制扩频算法,信噪比在-8DB-20DB之间变化时,系统的误码率均可保持在10-3以下。

An adaptive modttlation spread spectrum algorithm （AMSS） in OFDM system is presented in this paper. This algorithm combines adaptive modulation with adaptive spread spectrum, therefore which can accommodate large variation of wireless channel. The simulation results show this algorithm can maintain a BER below 10-3 when SNR varies from -8dB to 20dB.