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This paper proposes suboptimal precoding vector (PV) selection schemes combined with frequency domain scheduling when closed-loop MIMO precoding is adopted in the LTE (Long-Term Evolution)-Advanced uplink based on single carrier-frequency division multiple access (SC-FDMA) radio access. In the proposed schemes, frequency domain channel-dependent scheduling is performed based on a tentatively selected...
A wide area ubiquitous network (WAUN) was proposed as a new network for achieving a ubiquitous/pervasive environment. A WAUN covers a geographically wide area and connects us to a large variety of sensors and actuators distributed in the real world. To detect events and to flexibly control actuators in the real world using this connectivity, we have proposed a data-sharing mechanism called uTupleSpace...
This paper addresses broadband radio access techniques for the long-term evolution (LTE) specified as the Release 8 specifications (Rel. 8 LTE) and LTE-Advanced in the 3rd Generation Partnership Project (3GPP). We first briefly describe the system requirements for the Rel. 8 LTE and LTE-Advanced. Then, we describe wider transmission bandwidths around 100 MHz to satisfy the peak data rate of 1 Gbps...
A sensor network covering a large area enables connection to various types of sensors and actuators, but application development becomes complicated because of the uncontrollable behavior of such a large number of devices. We propose the u Tuple Space model for uniform and indirect communication with two extensions to the original tuple space model. The extensions enable efficient range search for...
We present field experiment results on multiple input multiple output (MIMO) precoding using orthogonal frequency division multiple access (OFDMA) in the E-UTRA downlink. We measured the throughput performance of 4??4 MIMO precoding with 1- to 4-stream transmission. Time variation characteristics of throughput, SINR, and antenna correlations are compared to evaluate the selection criteria for the...
This paper investigates the effect of the antenna (polarization diversity (PD) or space diversity (SD)) configuration at evolved Node B and antenna angle of user equipment (UE) on the throughput performance of multiple input multiple output (MIMO) in Evolved UMTS Terrestrial Radio Access (E-UTRA) field experimental system. The results show that the throughput performance as a function of the measured...
This paper investigates the uplink throughput performance while taking into account transmission power control (TPC), adaptive modulation and channel coding (AMC), and allocation bandwidth using an Evolved UTRA (E-UTRA) laboratory experimental system. Based on the experimental results, the E-UTRA improves the peak rate of a single user equipment (UE) by allocating a wider bandwidth to that UE and...
This paper investigates the effect of the bandwidth allocated to the physical downlink shared channel (PDSCH) and the amount of channel quality indicator (CQI) information that is feedback by the user equipment (UE) via the physical uplink control channel (PUCCH) on the throughput performance of the PDSCH using an E-UTRA laboratory experimental system in SIMO, 2x2 MIMO, and 4x4 MIMO transmissions...
This paper presents experimental results on MIMO multiplexing and MIMO diversity using precoding for OFDMA radio access in the evolved UTRA downlink. In the evaluations, we compare throughput performance of 4times4 MIMO with 1 to 4-stream transmission for various modulation and channel coding scheme (MCS) set to clarify the selection criteria for the number of streams on rank adaptation as the function...
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