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- 저자 : Naotaka Shibata (검색결과 1 건)
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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.
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