Noriyuki Fukui

On peak to average power ratio of generalized frequency division multiple access

We propose a generalized frequency division multiple access (GFDMA) scheme which realizes a low PAPR characteristic compared with OFDMA, maintaining the sufficient capability of the frequency scheduling. GFDMA transmits the data with one or more frequency resources which can be divided into several pieces in the frequency domain. We can adaptively configure GFDMA between PAPR-oriented configuration like as SC-FDMA and throughput-oriented configuration like as OFDMA, depending on requirements. We focus on the investigation on the PAPR characteristic of GFDMA. Computer simulation confirms that GFDMA has a low PAPR property compared with OFDMA, still keeping sufficient frequency resource allocation capability.

An ultra accurate inter-node carrier frequency synchronization through wireless link

This paper proposes an ultra accurate inter-node carrier frequency synchronization which keeps carrier frequency offset between wireless nodes less than 1Hz in slowly time-varying Rician fading channels. In the proposed method, one of the two nodes adjusts its carrier frequency to be close to the other nodes carrier frequency based on bi-directional channel measurements. We demonstrate that the proposed scheme achieves very small inter-node carrier frequency offset, e.g. less than 0.01 Hz. This synchronization scheme is useful in improving performance of wireless applications, such as cooperative coherent transmission or mobility measurements.