Abstract:
Multiple access interference (MAI) is the main factor
affecting the performance of channel estimation
techniques for code division multiple access (CDMA)
systems. Although, several multi-user channel estimation
algorithms have been proposed to mitigate MAI, these
algorithms require high computational complexities. In
this paper, we address the problem of least squares (LS)
mobile channel estimation at high channel efficiency that
requires a short training sequence along with the
spreading sequences. Then, we employ an efficient
iterative method based on conjugate gradient (CG)
algorithm to reduce the computational complexity of the
estimation method. Computer simulations illustrate that
the proposed method performs almost identical to the
exact LS estimate for reasonable training lengths.
