An OFDM-Based Distributed Transmission Scheme for Uncoordinated Transmitters Without Carrier Frequency and Timing Synchronization
Distributed transmission involving multiple uncoordinated transmitters has become a popular subject in wireless communications, such as cooperative transmissions, relaying, distributed MIMO, network coding, multi-access and multiuser detection. One of the major challenges for implementing distributed transmissions is the difficulty of synchronizing carrier frequency and timing of the distributed transmitters. In this paper, the authors propose a new OFDM-based transmission scheme that does not require carrier frequency and timing synchronization. Specifically, by exploiting jointly OFDM Cyclic Prefixes (CP), spreading and scrambling techniques, the receiver can mitigate multiple carrier frequency offsets and timing offsets successfully.