CAJ | 학술논문

为了降低正交频分复用（OFDM）水声（UWA）通信系统的峰均比（PAPR），使放大器能工作在线性有效区，传统的限幅方法通常会引入较大的限幅噪声。针对这一问题，提出了一种低复杂度的降低限幅噪声的算法。该算法采用不同的限幅门限对不同的信号幅度作限幅处理，同时将处理结果以限幅向量的形式传送至接收端，以准确恢复相应被限数据的原始幅度，从而降低限幅噪声。通过理论分析和计算机仿真，结果表明该算法在少量增加系统运算复杂度的前提下，能使线性放大器工作在有效范围内，而且能够有效抑制系统的限幅噪声。
위료강저정교빈분복용（OFDM）수성（UWA）통신계통적봉균비（PAPR），사방대기능공작재선성유효구，전통적한폭방법통상회인입교대적한폭조성。침대저일문제，제출료일충저복잡도적강저한폭조성적산법。해산법채용불동적한폭문한대불동적신호폭도작한폭처리，동시장처리결과이한폭향량적형식전송지접수단，이준학회복상응피한수거적원시폭도，종이강저한폭조성。통과이론분석화계산궤방진，결과표명해산법재소량증가계통운산복잡도적전제하，능사선성방대기공작재유효범위내，이차능구유효억제계통적한폭조성。
In the process of reducing the Peak to Average Power Ratio(PAPR)of the Underwater Acoustic(UWA)Orthogonal Frequency Division Multiplexing(OFDM)systems, the traditional clipping methods are used with high noise for the High Power Amplifier(HPA)working in the linear region effectively. In order to decrease the noise, a novel algorithm with low complexity is proposed. Different clipping values are used to clip different amplitude of signals. And then the above clipping results are recorded by a vector for the recovery of the original amplitude and the clipping noise is decreased. Theoretical analysis and simu-lation results show that the algorithm can restrain the clipping noise effectively with a low computation and make the amplifier work properly.