E-MBS Zone Specific Pilot Patterns for MBSFN
Document Number: IEEE C80216m-09/1951
Date Submitted: 2009-08-30
Source:
Kaushik Josiam, Wu Qi, JaeJeong Shim, Email: kjosiam@sta.samsung.com
Samsung Electronics
Venue:
IEEE Session #63, Jeju, Korea.
Re:
P802.16m/D1 - Enhanced – Multicast Broadcast Service (E-MBS)
Call for Contributions on Project 802.16m Amendment Content : IEEE 802.16m-09/0037
Purpose:
To discuss and adopt the proposed text in the revision of the 802.16m SDD.
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1
E-MBS Specific Pilots
• E-MBS content is to be transmitted in the SFN
mode, with multiple BSs transmitting the same
information for a particular MBS zone
– Delay spread is higher than typical unicast scenarios,
and is dependent on the ISD and the MBSFN channel
model
– Unicast pilot patterns are not sufficient
• The maximum of pilot streams allowed in E-MBS
specific pilots is 2
• New pilot pattern must be designed for E-MBS
2
Simulation Parameters
OFDM parameters
10 MHz (1024 subcarriers)
Number of OFDM symbols per subframe
6
Data burst size
4 PRUs distributed uniformly over 48 PRUs
Permutation
Tone based LDRU
Number of total RU in one subframe
48
Number of Antennas
Transmission mode
Channel coding
Modulation/Coding
Channel model
Channel estimation
MIMO detector
Scenarios
2 transmitter antennas, 2 receiver antennas [2Tx,2Rx]
1 transmitter antenna, 2 receiver antennas [1Tx,2Rx]
Rate 1 transmission scheme: SFBC, rate – 1 precoding
Rate 2 transmission scheme: Spatial Multiplexing (SM)
LTE FEC with 8 Turbo decoding iterations
QPSK ½, QPSK ¾, 16QAM ½, and 16QAM ¾ (for rate-1 transmission)
16QAM ½, and 16QAM ¾, 64QAM ½, and 64QAM ¾ (for rate-2 transmission)
MBSFN channel models for 1.5km ISD and 5km ISD with MS speed of
120kmph
2-D MMSE channel estimator with 3 PRU level CE
Delay Spread perfectly known
LMMSE for SFBC and SM
Noise limited
3
Pilot Patterns
BLER vs. SNR MBSFN 1500m SFBC
ZTE, ITRI and Samsung
performance similar. INTEL is
slightly worse
SE vs SNR MBSFN 1500m SFBC
BLER vs. SNR MBSFN 5000m SFBC
INTEL pilot pattern is dense,
improves MSE. However, for SFBC,
the code-rate suffers since there are
fewer tone-pairs with INTEL than
with other patterns
SE vs SNR MBSFN 5000m SFBC
Slightly lower overhead
improves SE for Samsung’s
pilot pattern
Observations
• ZTE, ITRI and Samsung Pilot Patterns competitive
– Samsung’s pilot overhead is slight lower than ZTE and
ITRI
• INTC proposes two pilot patterns depending on
ISD
– The ABS is not uniformly deployed, so operator has no
clear idea what pilot pattern to use in case of nonuniform deployment
– The pilot pattern for 5000m ISD increases channel
coding rate for the same packet size due to increased
overhead
Proposed Amendment text
Insert the following pilot pattern under the
section for EMBS Specific pilot patterns
MSE vs SNR MBSFN 5000m SFBC