Mimo Transmission Schemes for LTE and HSPA Networks June-2009

[therebounder]

Mimo Transmission Schemes for LTE and HSPA Network. Enjoy!

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
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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