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Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yasuyuki Yoshimizu,Shintaro Hisatake,Shigeru Kuwano,Jun Terada,Naoto Yoshimoto,Tadao Nagatsuma 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach forgenerating highly stable coherent sub-terahertz (THz) signals forwireless communications. As proof-of-concept we transmit data at100 GHz carrier frequency using on-off keying modulation andheterodyne detection. The sub-THz carrier signals are generatedby photo-mixing two optical carrier signals at different frequencies,extracted from an optical frequency comb. We introducea novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bitrate of 8.5 Gbit/s at 100 GHz.
Kenji Miyamoto,Naotaka Shibata,Shigeru Kuwano,Jun Terada,Akihiro Otaka 한국통신학회 2018 Journal of communications and networks Vol.20 No.6
In this paper, we evaluate the wireless uplink performanceand the mobile fronthaul (MFH) bandwidth of split-physicallayer (PHY) processing (SPP), which is a base station (BS) functionalsplit scheme used to link baseband units (BBUs) and remoteradio heads (RRHs) in a centralized/cloud - radio access network(C-RAN). SPP enables MFH bandwidth reduction by splittingthe BS functions between channel coding/decoding and modulation/demodulation within the PHY layer functions. SPP alsoenables high coordinated multipoint (CoMP) transmission and receptionperformance by employing uplink joint reception (JR) withlog likelihood ratio (LLR) combining. Link level simulation resultsshow that SPP with LLR combining achieves a block error rate(BLER) performance of 10% with a signal to noise ratio (SNR)penalty of less than 1 dB compared with that of conventional CRAN,which centralizes PHY layer functions in BBU. In addition,SPP has an SNR gain of more than 3 dB over medium access control(MAC)-PHY split, which splits the BS functions between theMAC and PHY layer functions. System level simulation resultsshow that SPP with LLR combining improves the cell-edge userthroughput by more than 33% over MAC-PHY split with selectioncombining and reduces the MFH bandwidth by 91% when comparedwith conventional C-RAN. Moreover, link and system levelsimulation results above are also observed when the channel estimationis non-ideal.
Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yoshimizu, Yasuyuki,Hisatake, Shintaro,Kuwano, Shigeru,Terada, Jun,Yoshimoto, Naoto,Nagatsuma, Tadao The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach for generating highly stable coherent sub-terahertz (THz) signals for wireless communications. As proof-of-concept we transmit data at 100 GHz carrier frequency using on-off keying modulation and heterodyne detection. The sub-THz carrier signals are generated by photo-mixing two optical carrier signals at different frequencies, extracted from an optical frequency comb. We introduce a novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bit rate of 8.5 Gbit/s at 100 GHz.