{"591121":{"#nid":"591121","#data":{"type":"event","title":"Ph.D. Proposal Oral Exam - Mu Xu","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle:\u0026nbsp; \u003C\/strong\u003E\u003Cem\u003EKey Digital-RoF Mobile-fronthaul Technologies with Statistical Data Compression and Multiband Multiplexing\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee:\u0026nbsp; \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Chang, Advisor\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Ma, Chair\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Weitnauer\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe objective of the proposed research is to design and implement new methods that improve the efficiency and signal quality in data conversion, transmission, and multiplexing processes in next-generation mobile fronthaul networks. The main technical areas involve statistical data compression of digitized wireless signal, spectral-efficient signal multiplexing, and impairment mitigation in heterodyne or homodyne detection in optical UL transmission. As a counterpart of analog radio-over-fiber (A-RoF) technology, digital radio-over-fiber (D-RoF) system, such as common public radio interface (CPRI), is a matured and robust solution to support RF signal delivery in traditional mobile fronthaul (MFH) networks. In view of recent progresses in delta-sigma modulation, data compression, and advanced error correcting coding, the efficiency of D-RoF is significantly improved, which motivates researchers to re-evaluate the role of D-RoF in future mobile fronthaul networks to support 5G and beyond wireless communications. In this proposal, we demonstrate two critical technologies to improve the transmission efficiency and flexibility of D-RoF systems. A fast-statistical estimation based data compression algorithm is proposed to reduce the number of quantization digits in a D-RoF based MFH with low complexity and high quality. Combined with re-sampling and advanced formats, data-transmission efficiency of a 25-Gbit\/s D-RoF testbed is improved by around five times. We also studied an offset-QAM carrier-less amplitude and phase modulation (OQAM-CAP) technique for spectral efficient multi-band RoF systems. In comparison with traditional QAM based CAP modulation schemes, the digital filter for each channel in OQAM-CAP can be adaptively redesigned to obtain either higher spectral efficiency or lower computational complexity.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Key Digital-RoF Mobile-fronthaul Technologies with Statistical Data Compression and Multiband Multiplexing"}],"uid":"28475","created_gmt":"2017-04-28 17:57:44","changed_gmt":"2017-04-28 17:57:44","author":"Daniela Staiculescu","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-05-12T15:30:00-04:00","event_time_end":"2017-05-12T17:30:00-04:00","event_time_end_last":"2017-05-12T17:30:00-04:00","gmt_time_start":"2017-05-12 19:30:00","gmt_time_end":"2017-05-12 21:30:00","gmt_time_end_last":"2017-05-12 21:30:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"434371","name":"ECE Ph.D. Proposal Oral Exams"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"},{"id":"1808","name":"graduate students"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}