Cooperative MIMO with Randomized Distributed Spatial Multiplexing
IEEE 802.16 Presentation Submission Template (Rev. 8.3)
Document Number:
IEEE S80216m-08_1272r1
Date Submitted:
2008-10-30
Source:
Chun Nie, Pei Liu, Shu Luo, Thanasis Korakis, Shivendra Panwar
Polytechnic Institute of New York University,
(formerly Polytechnic University)
6 Metrotech , Brooklyn, NY 11201
Voice: 718-260-3740
Fax: 718-260-3074
Email: cnie01@students.poly.edu;
pliu@poly.edu
shuo01@students.poly.edu
korakis@poly.edu;
panwar@catt.poly.edu
Venue:
IEEE 802.16 Session #58, Denver, Dallas (relay)
Base Document:
IEEE C802.16m-08_1272r1
Purpose:
To incorporate cooperative MIMO with randomized distributed spatial multiplexing proposed herein into IEEE 802.16m system description document (SDD).
Notice:
This document has been prepared to assist IEEE 802.16. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this
document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
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Cooperative MIMO with Randomized
Distributed Spatial Multiplexing
Authors:
Chun Nie, Pei Liu, Shu Luo, Thanasis Korakis, Shivendra Panwar
Polytechnic Institute of New York University, Brooklyn, NY, 11201
(formerly Polytechnic University, NY)
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Outline





Introduction
Randomized Distributed Spatial Multiplexing (RDSM)
Summary of RDSM Advantages
Performance Evaluation
Conclusions
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Introduction (1/2)
 In this contribution, we propose the use of Randomized Distributed
Spatial Multiplexing (RDSM) to boost the uplink capacity in a twohop virtual MIMO system
 RDSM is a SM technique that uses Relay Stations (RSs) and
Subscriber Stations (SSs) as “helpers” to deliver higher data rtes.
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,
Introduction (2/2)
RDSM is implemented in a 2-hop system for the uplink transmission
– First hop: All potential helpers decode the source signal.
– Second hop: Helpers cooperatively forward the signal to destination by using
RDSM encoded signals.
 Spatial multiplexing gain is achieved over the second-hop.
 RDSM encoder is embedded in each helper as follows.
MIMO encoder’s output: K parallel
streams, where K is no larger than
the minimum of (M, L), assuming
BS has L antennas and the
second hop has M helpers.
Each helper transmits a random
weighted sum of all K streams.
 RDSM does not limit the number of antenna elements at each
helper.
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Summary of RDSM Advantages
 Provides spatial multiplexing gain for the second hop of a single-antenna
SS in the uplink
 When the number of stations is large, the source can recruit enough
helpers to transmit at peak rate.
 Better than Distributed BLAST
– A predetermined number of helpers in the system is NOT needed.
– No need to index each helper and assign a specific antenna for each of
them. Thus, signaling is reduced. All potential helpers can contribute to
cooperation.
– SS are allowed to participate in cooperation and transparently cooperate
with RS to enhance spatial multiplexing gain.
– Detailed channel information over the two hops is NOT necessary. The
transmitter only needs a statistical estimation of the channel to estimate the
outage performance. Hence, signaling for channel estimation is minimized.
– RDSM is easy to implement in each helper station by using embedded
software. No substantial increment in hardware complexity
Conclusion:
RDSM is more robust than Distributed BLAST
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Performance Evaluation
QPSK
-1
10
Randomized Spatial Multiplexing
Centralized BLAST
Setting:
• V-BLAST is used for comparison.
• Each helper is single-antenna; BS has 4 antennas
• Single-hop: Direct transmission
• Two-Hop Single-Relay: One RS only
• RDSM
Network aggregrated throughput
-2
10
BER
55
-3
10
50
45
Single-hop
Two hop, 1-helper
RDSM
-4
10
15
20
25
SNR (db)
30
35
Throughput (bit/s)
10
40
40
35
30
25
20
15
0
20
40
60
80
100
Number of SS
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Conclusions
 RDSM can significantly enhance system performance in terms of
throughput.
 RDSM significantly increases performance for SS at the cell edge.
 RDSM provides BER performance comparable to a centralized
spatial multiplexing system (e.g., BLAST)
 RDSM is more robust than a general distributed BLAST system.
 RDSM can be incorporated in a multi-hop scenario.
 We suggest incorporating RDSM into IEEE 802.16m
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