A Class of Multi-Carrier CDMA Access Methods for Wide-Bandwidth Wireless Channels

In this article we describe and evaluate a general class of synchronous multi-carrier CDMA methods. In the proposed methods each accessing user is encoded by a Hadamard sequence and a multi-carrier (MC) encoder. The MC-encoder may provide one or many sub-carriers for each access channel while each accessing user may distribute its transmit power over all sub-carriers of its own access channel or over all subcarriers of all access channels. Each sub-carrier then carries the transmitted symbols of all users which are distinguished by their Hadamard sequences. In the performance evaluation presented herein we have examined their tolerance to synchronization jitter