Direct sequence spread spectrum (DSSS) communication systems has been widely used in these years for its advantage of wide spectrum, low working Signal-to-Noise ratio (SNR), anti-interference, anti-multipath effect and capability of LPI and LPD.

传统CDMA程序，支持四用户传输，可以输出误比特率曲线，适合于初学者学习使用。-Traditional CDMA program, support for quad-user transmission, it can output bit error rate curve, suitable for beginners learning to use.

In this paper, we investigate blind channel estimation for Multiple Input Multiple Output (MIMO) multi-carrier CDMA (MC-CDMA) systems in the uplink scenario. An Autocorrelation Contribution Matrix (ACM) method is proposed in comparison with the sub