LTE Advanced

April 1st, 2013
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This is an educational simulator for evaluating both the downlink and uplink performance of the LTE Advanced technology. Turbo-coded OFDMA for downlink and SC-FDMA for uplink are considered. Both direct transmission and relaying are considered. This simulator is especially useful for research students working on wireless communication technologies. It is also a useful resource for network engineers to plan for the placement of base station and relay station for a given geographical map.By taping the info button at the top left corner, users can modify the simulation parameters including modulation scheme, node speed, channel model and the number of users. The transmit Signal to Noise power Ratio (SNR) and Path Loss can also be edited. User can choose to use the current location as the center of the Googlemap. Alternatively, user can choose to use any other location as well as zooming in and out of the map. When the bottom right button is turned to ON, the Base station (B), Relay node (R) and User nodes (U) will appear on the map. Users can tap the nodes to activate (or deactivate) their movements. The nodes can also be dragged to different locations on the map.
The simulator will show the corresponding received SNR (SNRr), distance between B and U as well as the Bit Error Rate (BER). When direct transmission between B and U is poor, a relay node will be employed for Amplify-And-Forward (AAF) or Decode-And-Forward (DAF) the source message from B to U (in the downlink) or U to B (in the uplink). Cooperative cognitive ratio technology is also employed for investigating the potential bandwidth (BW) saving. The calculation of the BW saved is based on the following research papers:
  1. W. Liang, S. X. Ng and L. Hanzo, “Adaptive turbo trellis coded modulation aided cooperative cognitive radio“, in IEEE Wireless Communications and Networking Conference (WCNC), Paris, 01 – 04 Apr 2012.
  2. W. Liang, S. X. Ng and L. Hanzo, “Cooperative Communication Between Cognitive and Primary Users“, IET Communications, 2013.

Versions:

  • 1.0.4:: In this version, we have included both uplink (SC-FDMA) and downlink (OFDMA) simulations. MIMO with 2 transmitters and 2 receivers are also supported. Decode-and-Forward (DAF) is now added on top of the Amplify-And-Forward (AAF). Source coding is added (Huffman coding) and the channel coding used is Turbo codes.
  • 1.0.3:: This version supports iPhone5. In previous versions, the nodes were set to static by default. Now the nodes are set to move by default. The U and R nodes can still be tapped to pause or to move.
  • 1.0.2 :: Bug fixed: in version 1.0.1, the path loss input keyboard does not disappear after hitting the ‘done button’.


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