对称升余弦键控(Symmetric Raised Cosine Keying, SRCK)调制是一种新型的二进制数字调制方法，通过改变频率变化曲线的极性来载荷信息。SRCK信号相位连续，频率变化平滑，具有能量集中度高、频带利用率高、抗幅度衰落能力强等特点。为了分析SRCK信号的通信性能，对SRCK信号波形样本的自相关系数和互相关系数表达式进行了推导，找到用第一类贝塞尔函数来推导其解析表达式的方法，并通过仿真验证，进一步分析了影响其相关值变化的因素。提出一种正交的SRCK调制方法，并对其特性进行了分析，为下一代高效调制通信系统的实现提供了一种新的途径。
Symmetric Raised Cosine Keying (SRCK) modulation is a new binary digital modulation method. The information is sent by the different polar of the frequency change waveform. For continuous phase and smoothing frequency change, the SRCK signals have characteristics about high energy concentration, high bandwidth efficiency and good resistance to amplitude fading. In order to analyze the communication performance of the SRCK modulated signals, the correlation of the SRCK modulated sample waveforms is deduced, and an analytic formula with the Bessel function is obtained. The main factors of effecting the correlation value changes are analyzed. Orthogonal symmetric raised cosine keying modulation method is proposed, and the characteristics of the signals are analyzed. An efficient modulation communication system is provided for next generation wireless communication.