Blind space-time channel estimation for DS-CDMA with aperiodic spreading code

The space-time channel can be described by a vector channel impulse response (VCIR). Estimating the VCIR is very important for smart antenna systems. Based on multiuser decorrelation, a blind VCIR estimation closed form method is proposed for CDMA with an aperiodic spreading code. The new method has the ability to resist the near-far effect. Computer simulation demonstrates that the accuracy of the VCIR estimated by the new method can meet the need for extracting DOA and time delay.