Optimizing future wireless communication systems

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1 Optimizing future wireless communication systems "Optimization and Engineering" symposium Louvain-la-Neuve, May 24 th 2006 Jonathan Duplicy ( 1

2 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 2

3 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 3

4 The first wireless communication system Jonathan Duplicy 4

5 Much better Jonathan Duplicy 5

6 Timeline (1/2) Maxwell predicts Electromagnetic Waves Hertz proves existence of EM waves Marconi transmits a message to his brother over 1400m Marconi successfully transmits radio signal across Atlantic Ocean First voice radio service A Marconi set was aboard the ocean liner Titanic when it went down Frequency Modulation (FM) radio invented by Armstrong. Jonathan Duplicy 6

7 Timeline (2/2) First generation (1983) : Cellular system Analog transmission Maximum 9.6kHz Second generation (1990) : Digital transmissions to transmit data between 9.5 Kbps and 14.4 Kbps in 800 MHz and 1.9 GHz frequencies Several advantages over analog, including : More efficient uses of frequency spectrum Quality of voice transmission does not degrade over distance Better security; more difficult to decode Requires less transmitter power Uses smaller and less expensive individual receivers and transmitters Third generation (recently) : 144 Kbps for a mobile user 386 Kbps for slowly moving user 2 Mbps for stationary user Fourth generation??? Jonathan Duplicy 7

8 Wireless Local Area Network (WLAN) Provides short-range, high-speed wireless data connections between mobile data devices and nearby Wi-Fi access points. Short range : m High speed : IEEE b : 11 Mb/s IEEE g,a : 54 Mb/s IEEE n : 540 Mb/s Low cost Other local protocols : Bluetooth, Wimax, Zigbee, Jonathan Duplicy 8

9 Wireless systems - summary Mobility High-speed/ Wide-area Medium-speed/ Urban-area Walking/ Local area Second Generation (gsm) Third Generation (UMTS) Fourth Generation? WLAN Standing/ Indoors cable Rates (Mb/s) Jonathan Duplicy 9

10 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple access Downlink OFDM SDMA Conclusions Jonathan Duplicy 10

11 Main challenges Increased data rates (bits/s). Improved quality of service : Bit error rate (BER) Mobility Reachability Latency Achieving a mix of both higher data rate and improved quality of service. Heterogeneous networks Jonathan Duplicy 11

12 Two major constraints Power Environemental issues Battery issues Interferences Need for power efficient schemes Spectrum Highly occupied Costly Frequency selectivity Need for highly spectrally efficient schemes Jonathan Duplicy 12

13 One of the many candidates Linear pre/decoding Orthogonal Frequency Division Multiplexing Linear MIMO-OFDM-SDMA Multiple-Input Multiple-Output Space Division Multiple Access Jonathan Duplicy 13

14 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple access Downlink OFDM SDMA Conclusions Jonathan Duplicy 14

15 Elements of a wireless digital communication system Information source Input transducer Source encoder Channel encoder Digital modulator Wireless channel Digital demodulator Output signal Output transducer Source decoder Channel decoder Jonathan Duplicy 15

16 Source coding Mapping from (a sequence of) symbols from an information source to a sequence of alphabet symbols (usually bits) such that the source symbols can be recovered from the binary bits. Jonathan Duplicy 16

17 Source image example Many redundancies Jonathan Duplicy 17

18 Source coding Mapping from (a sequence of) symbols from an information source to a sequence of alphabet symbols (usually bits) such that the source symbols can be recovered from the binary bits. Data compression : limit the quantity of useless information transmitted by the system. Lossy / lossless source codes Fixed length / Variable length Ex. : JPEG, MPEG, ZIP, Jonathan Duplicy 18

19 Elements of a wireless digital communication system Information source Input transducer Source encoder Channel encoder Digital modulator Wireless channel Digital demodulator Output signal Output transducer Source decoder Channel decoder Jonathan Duplicy 19

20 Channel coding Reverse of source coding : Introducing some structured redundancy among the data Protect data against errors from channel Classical codes : Linear block codes, convolutional codes, "Modern codes " : LDPC codes, turbo codes. Jonathan Duplicy 20

21 Elements of a wireless digital communication system Information source Input transducer Source encoder Channel encoder Digital modulator Wireless channel Digital demodulator Output signal Output transducer Source decoder Channel decoder Jonathan Duplicy 21

22 Digital modulation The modulator maps discrete vector x onto analog waveform, Moves it into transmission band (ex. 2.4Ghz) In phase and in quadrature components. Model : s : complex symbol from constallation (e.g. 16-QAM) Jonathan Duplicy 22

23 Elements of a wireless digital communication system Information source Input transducer Source encoder Channel encoder Digital modulator Wireless channel Digital demodulator Output signal Output transducer Source decoder Channel decoder Jonathan Duplicy 23

24 Wireless channel Jonathan Duplicy 24

25 Elements of a wireless digital communication system Information source Input transducer Source encoder Channel encoder Digital modulator Wireless channel Digital demodulator Output signal Output transducer Source decoder Channel decoder Jonathan Duplicy 25

26 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 26

27 Multiple antenna concept SISO : Single Input Single Output SIMO : Single Input Multiple Output Jonathan Duplicy 27

28 MIMO : Multiple Input Multiple Output Increased received power (array gain) Diversity: transmit the signal via several independent diversity branches to get independent signal replicas High probability: all signals not fade simultaneously. Protection against fading. Hence, to increase the signal quality Or increase data rates Need for rich scattering environnement Jonathan Duplicy 28

29 Beamforming Single omni-directional antenna Array of omni-directional antennas Jonathan Duplicy 29

30 Beamforming Jonathan Duplicy 30

31 Beamforming illustration (1/4) Jonathan Duplicy 31

32 Beamforming illustration (2/4) Jonathan Duplicy 32

33 Beamforming illustration (3/4) Jonathan Duplicy 33

34 Beamforming illustration (4/4) Jonathan Duplicy 34

35 Beamforming spatial diversity Jonathan Duplicy 35

36 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 36

37 Frequency selectivity Broadband channels are frequency selective : Jonathan Duplicy 37

38 Multicarrier modulation OFDM : Orthogonal Frequency Division Multiplexing gain frequency N flat fading channels Jonathan Duplicy 38

39 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 39

40 Space Division Multiple Access Use beamforming to separate the users which transmit at : The same time The same frequency Jonathan Duplicy 40

41 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple Access Downlink OFDM SDMA Conclusions Jonathan Duplicy 41

42 System model Jonathan Duplicy 42

43 Goal / Assumptions Design linear pre/decoder to optimize signal quality with : rate constraints transmit power constraint : Perfect channel knowledge First idea : come back to single user solutions Jonathan Duplicy 43

44 Pre-decoder orthogonal design (Ortho1) Jonathan Duplicy 44

45 Ortho1 : Nulling constraints Jonathan Duplicy 45

46 Ortho1 : Nulling constraints Jonathan Duplicy 46

47 Ortho1 : Availability conditions Jonathan Duplicy 47

48 Ortho1 : Simulations Jonathan Duplicy 48

49 Ortho1 : Simulations Pre-ortho (5x2) (5x1) Post-ortho (1x2) (3x1) Jonathan Duplicy 49

50 Post-decoder orthogonal design (Ortho2) Jonathan Duplicy 50

51 Ortho2 : nulling constraints Idea : same as Ortho1 with enhanced channel : However, optima receivers G : Jonathan Duplicy 51

52 Ortho2 : iterative algorithm Jonathan Duplicy 52

53 Ortho2 : Availability conditions Jonathan Duplicy 53

54 Ortho2 : simulations Jonathan Duplicy 54

55 Ortho2 : simulations Pre-ortho Post-ortho Ortho1 (5x2) (1x2) Ortho2 (5x2) (3x2) Jonathan Duplicy 55

56 Min-MSE design MSE : Mean Square Error Jonathan Duplicy 56

57 Min-MSE design Jonathan Duplicy 57

58 Min-MSE design Jonathan Duplicy 58

59 Min-MSE design : iterative algorithm Jonathan Duplicy 59

60 Min-MSE design : simulations Jonathan Duplicy 60

61 Max-min-SINR design - preliminaries Assume flat fading channels (N=1) Split beamforming design and power allocation : Jonathan Duplicy 61

62 Max-min-SINR design SINR : Signal to Interference and Noise Ratio Jonathan Duplicy 62

63 Max-min-SINR design Jonathan Duplicy 63

64 Max-min-SINR design Optimal receive beamformers for given p,f : Jonathan Duplicy 64

65 Max-min-SINR design Optimal transmit beamformers for given p,g : Coupled problem!! Jonathan Duplicy 65

66 SINR duality Duality : The same SINR can be achieved for both the downlink and uplink scenarios. Jonathan Duplicy 66

67 Uplink dual system Jonathan Duplicy 67

68 Max-min-SINR design Optimal transmit beamformers for given p,g : Duality => F designed as the optimal receiver of the dual system Jonathan Duplicy 68

69 Max-min-SINR design Optimal power assignment for fixed pre/decoders Jonathan Duplicy 69

70 Max-min-SINR design Optimal power assignment for fixed pre/decoders Jonathan Duplicy 70

71 Max-min-SINR design Optimal power assignment for fixed pre/decoders Uplink case : Jonathan Duplicy 71

72 Max-min-SINR design : iterative algorithm Concave for Nr=1 Jonathan Duplicy 72

73 Max-min-SINR : simulations Jonathan Duplicy 73

74 Summarizing comparison Jonathan Duplicy 74

75 Outline History Challenges and constraints Fundamentals Multiple antenna concept Multicarrier Modulation Space Division Multiple access Downlink OFDM SDMA Conclusions Jonathan Duplicy 75

76 Conclusions You are very welcome to the digital communications community! Hot topics include : MIMO Multiuser schemes Imperferct CSI based designs Relay networks Ad Hoc networks Sensor networks Ultrawide band systems Turbo coding Jonathan Duplicy 76

77 Thanks for your attention Questions? Jonathan Duplicy 77

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