Date : 17.07.2017
Time: 3:00 PM
Venue: CSD 308
Speaker: Amol Delmade (EE14S020)
Guide: Dr. Deepa Venkitesh
GTC Members :
Dr. Anil Prabhakar (Chairperson)
Dr. Balaji Srinivasan (M)
Dr. Vijayan.C (M)(Ph)
Centralized radio access network (C-RAN) has been extensively studied in past few years for better co-ordination between base stations (BS) to minimize the interference. This necessitates the centralized baseband unit (C-BBU) and remote radio head (RRH) units to be connected through a high speed, low latency and accurately synchronized network, referred to as the fronthaul. Optical fiber have gained importance for providing fronthaul services, with distances expected to be anywhere between several meters to tens of kilometers. Signals can be transmitted through the fronthaul network in analog or digital domain at the baseband (BB) or passband band with respect to optical carrier, resulting in different transmission schemes.
In this talk, we will discuss the possible fronthauling schemes – digitized baseband over fiber (DBBoF), analog intermediate frequency over fiber (AIFoF) and digitized IFoF (DIFoF). Simulation results for transmission of OFDM signals complying to the WLAN standards over these links will be presented. Experimental results for fronthauling – of 20 MHz LTE 4G and 201 MHz 5G candidate waveforms such as generalized frequency division multiplexing (GFDM) and universally filtered – OFDM (UF-OFDM) – over direct modulation based AIFoF link will be discussed. In addition, effect on the performance of LTE signal in coexistence with multiple bands of WLAN and UF-OFDM over fronthaul link will be presented. We conclude with our recommendations on the optimal fronthauling solution for the next generation wireless systems.