An 802.11ax 4×4 spectrum-efficient WLAN AP transceiver SoC supporting 1024QAM with frequency-dependent IQ calibration and integrated interference analyzer
| Autor: | Kentaro Yoshioka, Takahisa Kaihotsu, Shusuke Kawai, Kentaro Taniguchi, Shigehito Saigusa, Yutaka Shimizu, Tomoya Horiguchi, Tsuguhide Aoki, Daisuke Yashima, Hiroaki Hoshino, Toshiyuki Yamagishi, Go Urakawa, Kazushi Koyama, Kensuke Nakanishi, Makoto Morita, Ryuichi Nihei, Takeshi Kumagaya, Yuki Ando, Masaaki Ikuta, Katsuya Nonin, Ichiro Seto, Asuka Maki, Hiroki Mori, Toshiya Mitomo, Atsushi Suzuki, Yasuo Unekawa, Daisuke Taki, Hiroshi Yoshida, Hiromitsu Aoyama, Ryoichi Tachibana, Makoto Arai, Daisuke Goto, Kazuhisa Horiuchi, Hirotsugu Kajihara, Kyosuke Takahashi, Hideki Yamada, Koichiro Ban, Tomohiko Takeuchi, Chen-Kong Teh, Hiroyuki Kobayashi, Motoki Nagata, Kohei Onizuka, Takayuki Kato, Takeshi Tomizawa, Katsuyuki Ikeuchi, Yuki Fujimura, Kengo Nakata, Kengo Kurose, Masahiro Sekiya, Rui Ito, Yosuke Hagiwara, Tomoya Suzuki, Mitsuyuki Ashida |
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| Rok vydání: | 2018 |
| Předmět: |
Spectrum analyzer
Orthogonal frequency-division multiplexing Computer science Bandwidth (signal processing) 020206 networking & telecommunications Throughput 02 engineering and technology Spectral efficiency Chip QAM Wireless lan Phase noise 0202 electrical engineering electronic engineering information engineering Electronic engineering Transceiver |
| Zdroj: | ISSCC |
| DOI: | 10.1109/isscc.2018.8310374 |
| Popis: | An exponentially Increasing number of wireless-LAN (WLAN) devices In a dense environment causes a decrease in throughput owing to collisions among the devices and the lack of contiguous bandwidth. The next-generation standard of 802.11ax improves spectrum efficiency by additionally supporting 1024 (1K) QAM, OFDMA with 80+80MHz; these impose several challenges to silicon design. 1K-QAM demands extreme IQ balance with an IRR better than −50dB over a wide frequency range up to 80MHz to achieve at least −35dB RX EVM or less. Noise characteristics better than −44dBc LO integrated phase noise as well as 50dB isolation between each TRX chain are mandatory. To best make use of the essential features defined in the 11ax standard, a real-time and arbitrary spectrum-resource control capability at each access point (AP) is beneficial both in terms of further improvement in spectrum efficiency as well as communication reliability in ISM coexisting bands and legacy WLAN. Interference identification of the order of 10μe while incorporating everything into a strictly limited silicon area is key to launching the advanced unique functionality. This paper presents a fully integrated 4×4 802.11abgn/ac/ax-compliant AP transceiver SoC. The chip offers frequency-dependent IQ (FD-IQ) mismatch calibration for both amplitude and phase, low-noise TX BB and multimode LO distribution techniques, and real-time interference detection including 2.4GHz inverter-type microwave (MW) ovens. |
| Databáze: | OpenAIRE |
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