Hiroshi Ochi
Department of Computer Science and Electronics, Kyushu Institute of Technology, Japan

Published : 3 Documents
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IEEE 802.11n Physical Layer Implementation On Field Programmable Gate Array Setiawan, Hendra; Nagao, Yuhei; Kurosaki, Masayuki; Ochi, Hiroshi
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 1: March 2012
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (51.295 KB)

Abstract

Register transfer level (RTL) development is a time cost step that requires high diligence and fidelity to get the valid interpretation of abstraction function of digital circuit. In this research, we introduce and prove that Model-Based Design Process (MBDP) is an effective and efficient way to develop a RTL complex system such as wireless communication. Using MBDP flow, we interpret, develop, and verify the physical layer RTL of a new standard that ratified on the end 2009, i.e. IEEE 802.11n wireless local area network (WLAN). The result of this research is a prototyping FPGA StratixII EP2S180 that has properly worked as a 2x2 MIMO WLAN with maximum throughput 144 Mbps.
DESIGN OF VERY HIGH THROUGHPUT WLAN SYSTEM FOR 4K DIGITAL CINEMA TRANSMISSION Syafei, Wahyul Amien; Ochi, Hiroshi
Transmisi Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.662 KB) | DOI: 10.12777/transmisi.11.4.166-171

Abstract

We proposed a design of a Very High Throughput Wireless LAN system. It reaches 33 meter propagation distance by using 80 Mhz bandwidth on 5 GHz band. The proposed preamble has backward compatibility with IEEE802.11n system, allows band sharing and avoids collision within 5 GHz band. The proposed preamble has comparable PAPR and preamble efficiency with IEEE892.11n system. Run test for transmitting 90 frames of 4K image size with 24 bit per pixel resolution for digital cinema simulation under in-door channel model demonstrates the excellent performance of the proposed system. Keywords: VHT WLAN, backward compatibility, PAPR, preamble efficiency, digital cinema transmission
PAPR REDUCTION FOR VERY HIGH THROUGHPUT WLAN WITH BACKWARD COMPATIBILITY TO IEEE802.11 A/N Syafei, Wahyul Amien; Ochi, Hiroshi
Transmisi Vol 11, No 3 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.762 KB) | DOI: 10.12777/transmisi.11.3.113-117

Abstract

We propose a simple technique to reduce PAPR for a Very High Throughput Wireless LAN with backward compatibility with IEEE 802.11a/n system. By applying proposed phase rotation in partial transmit sequence technique we got PAPR reduction up to 3.01dB lower than conventional one, yields in comparable PAPR with IEEE802.11n preamble. Keywords: Gigabit, Wireless LAN, backward compatibility, IEEE802.11a/n WLAN System, PAPR reduction.