機能分散型光無線移動通信システムの設計法に関する一検討

摘要

This paper presents the design and performance of fiber-optic cloud mobile communication systems to facilitate smart and broadband distribution networks, which make it possible to provide coordinated multi-point transmission/reception (CoMP) and wireless relaying. The design of Cyclic Prefix (CP) in OFDM signal is discussed to clarify the allowable optical fiber length difference between micro-eNBs. Theoretical CNR performance is described for the two types of optical devices such as FP-LD and DFB-LD. Receiver sensitivity in uplink is pointed out as the overall system performance. Fiber-optic relay node (RN) is also proposed for three types of Layer 1, Layer 2 and Layer 3 relaying. The transmitting CNR and the effort for reducing the interference are discussed. Furthermore, we propose new wireless relaying with CRE to extend coverage automatically to heavily shadowed areas.%本論文では，光無線技術の適用によって通信機能をネットワークとアンテナに分散する機能分散型移動通信システムを提案する.その中で，提案システムの構成，利点を示すとともに，OFDM信号を用いた場合の伝送特性（受信感度特性など）およびCP設計について明らかにする.また，光無線技術のリレー通信への応用について述べる.その構成法，干渉に対する利点等について述べるとともに，上下リンクの伝送特性を明らかにする.さらに，リレーノードのカバレッジをダイナミックに変動させるCRE型リレー通信を提案し，その構成法を示す.