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This paper presents field experiment results for rotational orthogonal frequency division multiplexing (R-OFDM) transmission and demonstrates that R-OFDM is superior to conventional OFDM even in actual radio transmission. R-OFDM is a multi-carrier transmission scheme proposed by the authors. It is characterized by the use of rotational code division multiplexing that enables OFDM to obtain suitable...
This paper presents field experiments on open-loop precoding multiple input multiple output (MIMO) using a testbed targeting International Mobile Telecommunication - Advanced (IMT-Advanced) systems. Open-loop MIMO is realized by applying Rotational OFDM (R-OFDM) to MIMO transmission. MIMO R-OFDM is more robust with respect to correlated channels than conventional open-loop MIMO-OFDM as was shown by...
Orthogonal frequency division multiple access (OFDMA) systems have recently drawn considerable attention as potential candidates for future generation cellular systems. To achieve proportional fairness among users while improving user's satisfaction in the upper layer, e.g. application and transmission control protocol (TCP) layers, we propose a novel multi-layer optimization approach for packet scheduling...
This paper presents an experimental evaluation of open-loop precoding MIMO (multiple input multiple output) using a testbed targeted at IMT-Advanced systems. Open-loop MIMO is realized by applying rotational OFDM (R-OFDM), that is previously proposed by authors, to MIMO transmission. MIMO R-OFDM is more robust with respect to correlated channels than conventional open-loop MIMO-OFDM, because it optimizes...
This paper presents the experimental results of rotational orthogonal frequency division multiplexing (R-OFDM) performance with a turbo decoder implemented in an IMT-Advanced testbed. Taking into account recent advances in research and development toward realization of the IMT-Advanced system era, the authors are developing the testbed. The R-OFDM is multi-carrier transmission scheme and previously...
Aiming at actual evaluation of IMT-Advanced system performance using field tests, this paper presents a developed IMT-Advanced testbed system with transmission bandwidth of 100 MHz. IMT-Advanced supports the "new capability of systems beyond IMT-2000" as indicated by the ITU-R van diagram [1] and requires a peak data rate of 1 Gbps with low mobility. In consideration of the enhanced IMT-2000...
In this contribution, an optimal inter-antenna and subblock shifting and inversion (IAS SI) scheme exploiting additional degrees of freedom brought by multiple antennas and subblocks is proposed to alleviate peak-to-average power ratio (PAPR) problem of MIMO-OFDM systems. In order to reduce the complexity of proposed scheme, two suboptimal schemes based on sequential search and transformation are...
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