Presentation is loading. Please wait.

Presentation is loading. Please wait.

Uplink MIMO proposal for IEEE m

Similar presentations


Presentation on theme: "Uplink MIMO proposal for IEEE m"— Presentation transcript:

1 Uplink MIMO proposal for IEEE 802.16m
Document Number: C80216m-08/538r1 Date Submitted: Source: Alexei Davydov[2] Yang-seok Choi[1] Voice: [1], [2] Alexander Maltsev[2] Intel Corporation [1]Portland, OR, US [2] Russia, Nizhny Novgorod, Ul. Turgeneva, 30 Venue: Call for contributions on project m SDD: Uplink MIMO Session #56: Denver, USA Base Contribution: IEEE C80216m-08/538r1 Purpose: For discussion and adoption by IEEE m group Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: < and < Further information is located at < and < >.

2 Generic Block Diagram for UL MIMO
Precoded Antenna Symbols Data bits QAM Symbols Number of Spatial Channels NSCH Number of Spatial Streams NSS Number of Transmit Antennas NTX Coded bits Space Frequency (Time) Encoded Symbols

3 Space Frequency Block Codes
Rate – 2 Rate – 1 In accordance to IEEE m system requirement document the system shall support the connection up to the highest supported speed of 350 kmph Space Time Block Code (STBC) is not appropriate for such high speeds due to loss of orthogonality in fast channel fading Space-frequency Block Code (SFBC) should be considered as a baseline scheme for IEEE m due to it’s robustness to the mobility Space Frequency Block Codes offers other advantages: Less buffering requirements – the decoding is performed for single OFMDA symbol Flexible to any frame structure design – easy to satisfy the requirement on even number interval transmissions

4 SFBC Link Layer Performance
Baseline SIMO in Ped.-B (3kmph) SFBC-A in Ped.-B (3kmph) SFBC-A in Veh.-A (60 kmph) SFBC-A in Veh.-A (120 kmph)

5 SFBC Link Layer Performance (Cont’d)
Matrix A rank-1 transmission Matrix B rank-2 transmission

6 Collaborative MIMO MS 1 MS 1 Base Station MS 1 Base Station Base Station MS 2 MS 2 MS 2 The UL network capacity is limited by the peak data rate of MS due to channel bandwidth, low modulation order and transmit power limitations small number of transmit antennas at the MS due to small form factor of hand held MS devices higher implementation cost of multiple power amplifiers Collaborative MIMO is an effective solution to increase the network capacity in the UL for such scenario collaborative MS may reuse the same time-frequency resource and transmit data simultaneously collaborative MS uses orthogonal pilot allocation to enable MIMO processing at the BS The efficiency of interference mitigation at the BS is provided by proper scheduling of collaborative MS Codebook precoding may be used to improve the efficiency of collaborative MIMO IEEE m should support up to four simultaneous streams transmission

7 Collaborative MIMO Link Layer Performance
Spatial Multiplexing Further gain of collaborative MIMO over SU-MIMO spatial multiplexing may be achieved by proper MS scheduling and pairing

8 UL MIMO Codebook Based Precoding
MS Base Station The usage of the precoding at the MS is essential to achieve IEEE m requirements Legacy IEEE802.16e codebook is not constant modulus scheme and causes antenna power imbalance problem for power limited MS Low PAPR codebooks constructions is required for IEEE m UL MIMO Constant amplitude with antenna subset selection codebook (see next slide) Example 1-TX (4 antenna MS) rate-1 antenna selection codebook construction

9 Constant Amplitude with Antenna Subset Selection Codebook Construction
Selection of the TX antenna subset Constant amplitude codebook with antenna subset selection Constant amplitude baseline codebook Antenna selection matrix Precoding on selected antenna subset Advantages of the proposed codebooks Low PAPR Structured construction Easy extensible to any number of MS antennas Optimized to power-limited MS Limits the actual number of transmitting antenna

10 Precoding Link Layer Performance

11 Summary of Proposed Uplink MIMO Modes
SU-MIMO Rate 1 Transmit Diversity Space Frequency Block Code (SFBC) Open loop and codebook precoding Rate 2 Spatial Multiplexing Single Codeword (SCW) MU-MIMO Up to four parallel spatial streams Open loop and precoded collaborative MIMO Two stage codebook precoding antenna subset selection constant amplitude precoding on selected antenna subset

12 Proposed Text for SDD (Cont’d)

13 Proposed Text for SDD (Cont’d)


Download ppt "Uplink MIMO proposal for IEEE m"

Similar presentations


Ads by Google