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Vodafone Chair Mobile Communications Systems, Prof. Dr.-Ing. G. Fettweis Case Study: Implementation Aspects of a GFDM-based Prototype for 5G Cellular Communications.

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Presentation on theme: "Vodafone Chair Mobile Communications Systems, Prof. Dr.-Ing. G. Fettweis Case Study: Implementation Aspects of a GFDM-based Prototype for 5G Cellular Communications."— Presentation transcript:

1 Vodafone Chair Mobile Communications Systems, Prof. Dr.-Ing. G. Fettweis Case Study: Implementation Aspects of a GFDM-based Prototype for 5G Cellular Communications Ivan Simões Gaspar  With the Vodafone Chair (Prof. Fettweis) since February 2012  Studies: Electrical Engineering (M.Sc.) at the National Institute of Telecommunications in Brazil – INATEL  Research area: robust non-orthogonal multi- carrier modulation schemes for future cellular systems NI RF Roundtable 2012 December 10-11, 2012, Bristol, UK

2 Motivations for 5G  M2M dominating subscribers diverse requirements (high and lows) :  data rate, latency, mobility, quality, security  asynchronous and non-orthogonal modulation  Opportunistic use of spectrum time and frequency agility accurate sensing no interferer (filtering) RF roundtable 2012

3 RF roundtable 2012 High rate, low latency, interactive video, apps, increased signaling vast # M2M devices low rate / complexity flexible fine-grained sharing of fragmented spectrum Wireless Access: flexible scalable content aware robust reliable CoMP RRM t f asynchronous access Challenges

4 4 Our approach RF roundtable 2012  Question the strict synchronism, orthogonality and high out of band radiation of OFDM based systems with the introduction of new non-orthogonal filtered waveforms that carry the data on the physical layer.  Deal with crosstalk and interference with a transceiver structure termed GFDM (Generalized Frequency Division Multiplexing).  Explore the tradeoff of an increased computational complexity at the Base Stations with a more flexible construction of millions of machine type communications (MTC) devices  Proof of concept prototype with a highly scalable implementation on NI’s PXI platform

5  generalization of OFDM 1 up to M symbols per subcarrier Pulse shaping with circular convolution (block structure - burst) GFDM Transmitter Model Mapping Up sampling FilteringUp conversion RF roundtable 2012 M = number of symbols per subcarrier K = number of active subcarriers

6 6 Matrix Model, x=Ad RF roundtable 2012  The A matrix contains all the possible impulse responses of the system Circular impulse response

7 RF roundtable First Demo – ‘Player Approach’ parametervalue Channel bandwidth20 MHz Max. number of subcarriers2048 PRB30 active subcarriers360 occupied bandwidth9.8 MHz carrier frequency2,4 GHz modulationQPSK filter, roll-offRRC, a = 0.5 block size14 Demo Setup System Parameters Transmit Signals

8 RF roundtable First Demo – ‘Player Approach’  Few weeks after receiving the HW we get a real time signal coming out of the box

9 9 A Low Complexity Model RF roundtable 2012 Time approach:  up sampling, circular convolution and up conversion Frequency approach:  DFT, spectrum repetition, windowing and position shift, IDFT

10 10 A Low Complexity Model RF roundtable 2012 Subcarrier processing time vs. frequency domain Subcarrier superposition in frequency domain circ. convolution repetition zero stuff windowing

11 11 Low Complexity Model (Matrix) RF roundtable 2012

12 12 Low Complexity Model RF roundtable 2012 GFDM Matrix Model OFDM reference GFDM Low Complex GFDM non sparse spectrum

13 13 LabView Style TX Model RF roundtable 2012

14 RF roundtable Second Demo – Offline TX LabVIEW interactive transmitter (offline)  LabView based implementation in less than 2 months after basic training  Very friendly graphical interface

15 15 Out of band Radiation RF roundtable 2012 GFDM (red curve) vs. OFDM (blue curve)

16 RF roundtable Third Demo – Online TX LabVIEW interactive transmitter (online)  PXI based implementation in less than 6 months  Very friendly RT and FPGA enviroments integration

17 RF roundtable Third Demo – Online TX

18 18 Current studies (RX) RF roundtable 2012 Math model Block Diagram ICIChannel distortions

19 19 Future directions RF roundtable 2012 UHF white spaces

20  Pulse shaped subcarriers can be achieved in GFDM at reasonable computational cost  Out of band radiation in GFDM can outperform OFDM by several orders of magnitude  Outlook A hardware implementation of the GFDM transceiver and its multi-user case application 20 Conclusions RF roundtable 2012

21 Vodafone Chair Mobile Communications Systems, Prof. Dr.-Ing. G. Fettweis Thank you.


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