In this paper, a two-dimensional information transmission method based on k step-complex spread spectrum (KS-CSS) is proposed. The aim is to solve the contradiction between the bandwidth and processing gain of a traditional direct-sequence spread spectrum (DSSS) channel, and to achieve better system performance (such as by obtaining higher processing gain and higher bandwidth utilization). Using the multi-domain characteristics of DSSS signals, based on the time–frequency characteristics of a DSSS, the code-domain characteristics are further combined. The KS-CSS method calculates the control coefficients such as modulation order, PN code group, and conversion time. Thus, dependence mapping for additional two-dimensional data transmission is established. Then, the spread spectrum pseudo-code is mapped and processed with one-dimensional data. Theoretical analysis and simulation results show that the time–frequency domain characteristics of the KS-CSS signal are consistent with those of traditional DSSS signals. However, the information transmission rate can be increased by more than 100%, and the bit error rate of data can be significantly improved. The high-speed transmission performance and low bit error rate of the KS-CSS method can provide a theoretical basis and technical reference for high-performance spread spectrum communication.

提出了一种基于k步复扩频（KS-CSS）的二维信息传输方法。目的是解决传统的直接序列扩频（DSSS）信道的带宽和处理增益之间的矛盾，并获得更好的系统性能（例如通过获得更高的处理增益和更高的带宽利用率）。利用DSSS信号的多域特性，基于DSSS的时频特性，可以进一步组合码域特性。KS-CSS方法计算控制系数，例如调制阶数，PN码组和转换时间。因此，建立了用于附加二维数据传输的依赖性映射。然后，扩频伪码被映射并利用一维数据进行处理。理论分析和仿真结果表明，KS-CSS信号的时频特性与传统DSSS信号一致。但是，信息传输率可以提高100％以上，并且数据的误码率可以显着提高。KS-CSS方法的高速传输性能和低误码率可以为高性能扩频通信提供理论依据和技术参考。