Abstract:

A simple timing and frequency synchronization method for the uplink orthogonal frequency division multiplexing code division multiple access (OFDMCDMA)was proposed, where the multi-user symbol timing was achieved by making use of good correlation property of training sequences that are distinguished not only in frequency domain but in code domain. Also the frequency offset was estimated based on maximum likelihood (ML) principle. Simulation result shows that the mean square error (MSE) performance of the proposed estimation algorithm is satisfied.

Key words: orthogonal frequency division multiplexing, code division multiple access, uplink synchronization