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Project Title Development of the Highly Available Wireless Backhaul Networks
Term 2013 ~ 2016 Funding HFR
Target Developing the optimal recovering/restoring technology against disasters and other network node faults
Key Technology Backhaul routing for mesh network
Interfernce control

Many services, such as mobile Internet and UHD, require high bandwidth, and current backhaul infrastructures are not optimized to handle this traffic. Technological advances like higher-order modulations and MIMO have boosted spectral efficiency, while remote radio heads improve the link budget, achieving lower noise figure receivers and more transmit power by eliminating feeder losses and noise. Also, governments have opened up more spectrum (e.g., digital dividend, new bands) for mobile broadband, responding to the growing importance of the industry. Using higher modulations is a proven, reliable, and well-understood method to increase capacity in a given communication channel, but it has clear limits. With each and every modulation step that we take, such as from 64-state quadrature amplitude modulation (QAM) to 128 QAM or from 1024 QAM to 2048 QAM, the available link budget decreases more or less linearly by 2 to 4 dB, limiting range and thereby cell size and, ironically, capacity. Surely, using higher frequencies like millimeter waves could fix this MIMO antenna placement challenge, yet it would at the same time increase path loss significantly and be very ineffective if not dysfunctional in non-line-of-sight (NLOS) scenarios that are rather the rule in macro cellular settings. High-order MIMO could in the end be confined to (near) line-of sight (LOS) scenarios, such as small cells.


 Networking protocol  

  - Design of on-demand backhaul-routing schemes (laced-ring topology)

   - BHREQ and BHACK

   - Categorized ring-finding and re-finding algorithms on laced-ring topology  

 PHY study   

   - Design and evaluation of relaying schemes for OFDM wireless backhauls 

   - AF with equalization vs. DF with symbol repetition  

  - Space-time coded opportunistic beamforming for MSs with multiple antennas  (to be applied  

     for finding and/or optimizing wireless backhaul-chaining in Rician fading environments)  

   - An efficient and practical MIMO (spatial) pre-coder (to improve link capacity in wireless  

     backhaul with many small antennas on mmWAVE)  

   - Full duplexed AF/DF relay with beamforming (to enhance spectrum efficiency and interference  

     immunity in chained wireless backhaul for dense small cells) 


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