Sadayuki Abeta

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This paper proposes broadband packet wireless access employing Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) with two-dimensional spreading that prioritizes time domain spreading in the forward link and Multi-carrier/DS-CDMA (MC/DSCDMA) in the reverse link for the system beyond IMT-2000. Based on the wireless(More)
This paper compares by computer simulation the achievable throughput performance employing fast packet scheduling algorithms focusing on the throughput of each user in High Speed Downlink Packet Access (HSDPA). Three packet scheduling algorithms are employed: the Maximum carrier-to-interference power ratio (CIR), Proportional Fairness (PF), and Round Robin(More)
This paper proposes broadband packet wireless access employing variable spreading factor-orthogonal frequency and code division multiplexing (VSF-OFCDM) in the forward link and multicarrier(MC)/DS-CDMA in the reverse link for the system beyond IMT-2000. Based on wireless access schemes, we propose major radio air interface parameters in the physical layer(More)
Release 8 (hereinafter referred to as “LTE Rel. 8”) specifications [1][2] which completed standardization by the 3GPP in the spring of 2009. LTE Rel. 8 adopts various high-level radio interface technologies such as orthogonal multi-access, frequency-domain scheduling and Multiple Input Multiple Output (MIMO) *2 , and provides even higher system capacity and(More)
Future-generation cellular wireless systems, transporting high bit rates in non-ideal radio propagation environments, must be robust to severe frequency selective multipath. Further requirements include moderate terminal and base station hardware costs, high spectral efficiency, and scalability of the cost of terminals with respect to their maximum bit rate(More)