Reliable uplink code-timing synchronization for cellular DS-CDMA
Yucheng Wei, James V. Krogmeier, Saul B. Gelfand · 2002
For the uplink of a CDMA system, some knowledge about the active users is known to the base station and can be used to improve code-timing acquisition of a new arrival. Based on this idea, two maximum-likelihood (ML) code-timing estimation algorithms are proposed. It is shown that both estimators can effectively cancel the multiple-access interference giving robustness to near-far ratio and system load. This fact is verified by simulation results, which also show their superiority to known algorithms.