Performance evaluation of long term evolution downlink-time division duplexing and frequency division duplexing
Oladapo, Oladotun O.
Performance evaluation of long term evolution downlink-time division duplexing and frequency division duplexing Oladotun O. Oladapo Supervisor:Devrim Seral - Nicosia Cyprus International University 2012 - XII, 77 p. col.pic., tab. 31 cm
Includes references.
CHAPTER 1 1 INTRODUCTION 1 Targets and Requirements for LTE 3 LTE Performance and Features 4 LTE Basic Concepts 5 Problems Statements 6 Aims of Thesıs 6 Thesis Organization 7 OVERVIEW OF LONG TERM EVOLUTION 8 LTE Network Architecture 10 Functional Description of LTE Network 11 Evolved Universal Terrestial Access Network (E-UTRAN) 11 Evolved Packet Core 12 LTE Physical Layer 15 Orthogonal Frequency Division Multiplexing(OFDM) 16 Cyclic Prefix 18 Fast Fourier Transform(FFT) 18 Orthogonal Frequency Division Multiple Access(OFDMA) 19 Frame Structure 21 Type-1 Frame Structure 21 Type-2 Frame Structure 22 TDD-FDD Duplex Transmission Modes 24 FDD 24 TDD 24 TDD/FDD Frequency bands 25 TDD versus FDD 27 Physical Layer Downlink 27 Slot Structure and Physical Resources Elements 28 Resources grid 28 Resource blocks 29 Modulation 31 Physical Channels 32 Downlink Channel Processing 34 Physical Signal 37 References Signal 37 Synchronozition Signal 39 Download Multiple Antenna Transmission Modes 40 Downlink Data Transmission 42 Downlink Radio Procedure 42 PROPAGATİON CHANNEL AND MODELS 45 Propagation Channel 45 Standard Channel Models 47 SISO and SIMO Models 47 ITU Channel Model 48 Extended ITU Channel Models 49 MIMO Channel Models 50 ITU Models with Spatial Correlation 51 Spatial Channel Model (SCM) 52 Winner Channel Model 54 SIMULATION MODEL 54 Simulaion Model 54 Bi Error Rate 57 Simulation Parameters 58 RESULT AND DISCUSSIONS 59 Scenario 1 59 Scenario 2 63 Scenario 3 66 CONCLUSION AND FUTURE WORKS 70 Conclusion 70 Future Works 73 REFERENCES 74
'The Long Term Evolution (LTE) is the next step into the next generation mobile cellular communication with the main targets of increased data rates, reduced latency and increased spectral efficiency. LTE has proved itself to be more challenging than its other counterpart\'s technologies and it\'s often been referred to as the leap into a new generation technology - fourth Generation (4G). When compared to other existing 4G technologies like Worldwide Interoperability for Microwave Access (WiMAX), it has shown superiority in terms of high mobility, back-ward compatibility with older generations, and also it supports both paired and unpaired spectrum, these factors makes it a dominant network of choice amongst mobile operators today. Starting from this premise, it is vivid that all aspects of LTE topics are worth investigating for both the industrial and academic communities. This work evaluates the performance of the paired used for Frequency Division Duplex (FDD) and unpaired used for Time Division Duplex (TDD) spectrum in LTE in terms of mobility, an important factor to consider in mobile cellular networks. This is when a mobile user is moving while active; the user\'s velocity causes a doppler effect, a phase shift in the frequency of the signal transmitted along each signal path which leads to fading. This work characterizes users\' mobility speed based on real-life scenarios average 5 km/h for pedestrian, average 70 km/h for mobile users on vehicle speed and average of 300 km/h for mobile users on high speed train. It has compared the TDD and FDD performance in terms of bit error rate (BER) with respect to signal noise ratios (SNR), a fundamental parameter to access the quality of digital transmission, considering different modulation schemes across different fading channels. Keywords: LTE, 4G, WiMAX, FDD, TDD, SNR, BER'
Performance evaluation of long term evolution downlink-time division duplexing and frequency division duplexing
Performance evaluation of long term evolution downlink-time division duplexing and frequency division duplexing Oladotun O. Oladapo Supervisor:Devrim Seral - Nicosia Cyprus International University 2012 - XII, 77 p. col.pic., tab. 31 cm
Includes references.
CHAPTER 1 1 INTRODUCTION 1 Targets and Requirements for LTE 3 LTE Performance and Features 4 LTE Basic Concepts 5 Problems Statements 6 Aims of Thesıs 6 Thesis Organization 7 OVERVIEW OF LONG TERM EVOLUTION 8 LTE Network Architecture 10 Functional Description of LTE Network 11 Evolved Universal Terrestial Access Network (E-UTRAN) 11 Evolved Packet Core 12 LTE Physical Layer 15 Orthogonal Frequency Division Multiplexing(OFDM) 16 Cyclic Prefix 18 Fast Fourier Transform(FFT) 18 Orthogonal Frequency Division Multiple Access(OFDMA) 19 Frame Structure 21 Type-1 Frame Structure 21 Type-2 Frame Structure 22 TDD-FDD Duplex Transmission Modes 24 FDD 24 TDD 24 TDD/FDD Frequency bands 25 TDD versus FDD 27 Physical Layer Downlink 27 Slot Structure and Physical Resources Elements 28 Resources grid 28 Resource blocks 29 Modulation 31 Physical Channels 32 Downlink Channel Processing 34 Physical Signal 37 References Signal 37 Synchronozition Signal 39 Download Multiple Antenna Transmission Modes 40 Downlink Data Transmission 42 Downlink Radio Procedure 42 PROPAGATİON CHANNEL AND MODELS 45 Propagation Channel 45 Standard Channel Models 47 SISO and SIMO Models 47 ITU Channel Model 48 Extended ITU Channel Models 49 MIMO Channel Models 50 ITU Models with Spatial Correlation 51 Spatial Channel Model (SCM) 52 Winner Channel Model 54 SIMULATION MODEL 54 Simulaion Model 54 Bi Error Rate 57 Simulation Parameters 58 RESULT AND DISCUSSIONS 59 Scenario 1 59 Scenario 2 63 Scenario 3 66 CONCLUSION AND FUTURE WORKS 70 Conclusion 70 Future Works 73 REFERENCES 74
'The Long Term Evolution (LTE) is the next step into the next generation mobile cellular communication with the main targets of increased data rates, reduced latency and increased spectral efficiency. LTE has proved itself to be more challenging than its other counterpart\'s technologies and it\'s often been referred to as the leap into a new generation technology - fourth Generation (4G). When compared to other existing 4G technologies like Worldwide Interoperability for Microwave Access (WiMAX), it has shown superiority in terms of high mobility, back-ward compatibility with older generations, and also it supports both paired and unpaired spectrum, these factors makes it a dominant network of choice amongst mobile operators today. Starting from this premise, it is vivid that all aspects of LTE topics are worth investigating for both the industrial and academic communities. This work evaluates the performance of the paired used for Frequency Division Duplex (FDD) and unpaired used for Time Division Duplex (TDD) spectrum in LTE in terms of mobility, an important factor to consider in mobile cellular networks. This is when a mobile user is moving while active; the user\'s velocity causes a doppler effect, a phase shift in the frequency of the signal transmitted along each signal path which leads to fading. This work characterizes users\' mobility speed based on real-life scenarios average 5 km/h for pedestrian, average 70 km/h for mobile users on vehicle speed and average of 300 km/h for mobile users on high speed train. It has compared the TDD and FDD performance in terms of bit error rate (BER) with respect to signal noise ratios (SNR), a fundamental parameter to access the quality of digital transmission, considering different modulation schemes across different fading channels. Keywords: LTE, 4G, WiMAX, FDD, TDD, SNR, BER'
Performance evaluation of long term evolution downlink-time division duplexing and frequency division duplexing