Blind channel estimation for multi-rate multicarrier DS/CDMA communications

Huang, L. and Zheng, F.-C. (2005) Blind channel estimation for multi-rate multicarrier DS/CDMA communications. International Journal of Wireless Information Networks, 12 (2). pp. 69-78. ISSN 1572-8129 doi: 10.1007/s10776-004-2401-0

Abstract/Summary

Multi-rate multicarrier DS/CDMA is a potentially attractive multiple access method for future wireless communications networks that must support multimedia, and thus multi-rate, traffic. Several receiver structures exist for single-rate multicarrier systems, but little has been reported on multi-rate multicarrier systems. Considering that high-performance detection such as coherent demodulation needs the explicit knowledge of the channel, based on the finite-length chip waveform truncation, this paper proposes a subspace-based scheme for timing and channel estimation in multi-rate multicarrier DS/CDMA systems, which is applicable to both multicode and variable spreading factor systems. The performance of the proposed scheme for these two multi-rate systems is validated via numerical simulations. The effects of the finite-length chip waveform truncation on the performance of the proposed scheme is also analyzed theoretically.