Interleaving Techniques for W-CDMA Linear Equalization Receivers

This paper focuses on the use of specific interleaving techniques for use in W-CDMA (wideband code division multiple access). The linear equalization algorithm usually performs a matrix inversion on a matrix with a high level of sparseness, and such sparseness shouldn´t be compromised with the use of a random interleaver; specific interleaver designs should be employed in order to keep the complexity of the equalization algorithm down to an acceptable level. The used equalizer is based on the linear MMSE (minimum mean square error) algorithm and is tested using the UMTS (universal mobile telecommunications system) HSDPA (high speed downlink packet access) standard as a basis, including the reference UMTS environments.