【資料名稱】：Mimo_Transmission_Schemes_for_LTE_and_HS

【資料作者】：3g american

【資料日期】：June-2009

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

Table of Contents
1 TERMINOLOGY .............................................................................................................................................. 4
2 Executive Summary ...................................................................................................................................... 5
3 PRINCIPLES .................................................................................................................................................... 6
3.1 Multi‐antenna‐transmission basics .........................................................................................................6
3.1.1 Improving SINR ................................................................................................................................ 6
3.1.2 Sharing SINR .................................................................................................................................... 6
3.1.3 Peak rate or coverage ...................................................................................................................... 8
3.1.4 Precoding......................................................................................................................................... 8
3.1.5 MIMO channel properties affecting the choice of transmission scheme ...................................... 11
3.1.6 What distinguishes beamforming relative precoding? .................................................................. 13
3.2 BS ANTENNA CONFIGURATIONS .......................................................................................................... 14
3.3 UE ANTENNA CONFIGURATIONS ......................................................................................................... 15
3.3.1 UE Considerations .......................................................................................................................... 15
3.3.2 Impact of Multiple Antennas on Size ............................................................................................. 17
3.3.3 Battery Consumption of Multiple Antennas .................................................................................. 17
3.3.4 Advanced‐Antenna Concepts for UE Application ........................................................................... 18
4 CURRENT MIMO TRANSMISSION SCHEMES ................................................................................................ 19
4.1 Introduction to LTE Rel‐8 MIMO Algorithms ....................................................................................... 19
4.2 DL SU‐MIMO AND Transmit Diversity (TxD) ........................................................................................ 20
4.2.1 Transmit diversity for two antenna ports ...................................................................................... 20
4.2.2 Transmit diversity for four antenna ports ...................................................................................... 21
4.2.3 Precoded spatial multiplexing for LTE ............................................................................................ 21
4.3 DL‐MIMO in HSPA ............................................................................................................................... 26
4.4 DL MULTIUSER MIMO .......................................................................................................................... 27
4.4.1 Single‐layer dedicated beamforming in LTE ................................................................................... 28
4.5 UL MULTIUSER MIMO .......................................................................................................................... 28
4.6 ALGORITHM ADAPTATION ................................................................................................................... 30
5 EMERGING MIMO TRANSMISSION SCHEMES ............................................................................................. 31
5.1 Downlink Dual‐Layer Beamforming ..................................................................................................... 31
5.2 Uplink Single‐User MIMO .................................................................................................................... 31
5.3 Extended Downlink Single‐User MIMO ............................................................................................... 32
5.4 MU‐MIMO ........................................................................................................................................... 32
5.5 CoMP ................................................................................................................................................... 34
5.5.1 PRINCIPLE ...................................................................................................................................... 34
5.5.2 CoMP Architecture ......................................................................................................................... 34
5.5.3 DL COMP ....................................................................................................................................... 36
5.5.4 UL COMP ....................................................................................................................................... 37
6 SYSTEM PERFORMANCE .............................................................................................................................. 37
6.1 MAPPING MIMO ALGORITHMS TO eNB and UE ANTENNA CONFIGURATIONS .................................. 37
6.1.1 Algorithm Mappings ....................................................................................................................... 38
6.2 DL SYSTEM PERFORMANCE ........................................................................................................... 39
6.2.1 The Baseline Case (1V) ................................................................................................................ 39
6.2.2. OL‐MIMO with DIV Antenna Configurations .............................................................................. 40
6.2.3. CL‐MIMO with DIV Antenna Configurations............................................................................... 43
6.2.4. MIMO with ULA‐4V ..................................................................................................................... 45
6.3 UL SYSTEM PERFORMANCE ........................................................................................................... 46
6.3.1 The Baseline Case with DIV‐1X ................................................................................................... 46
6.3.2 UL MU‐MIMO with DIV‐1X ......................................................................................................... 47
7 Concluding Remarks .................................................................................................................................. 49
8 REFERENCES ................................................................................................................................................ 50
9 ACKNOWLEDGEMENTS ............................................................................................................................... 50