performance-evaluation.rar - This master thesis work is focused on measurement based performance analyses of different special multiplexing (SM) modes available in LTE Release 8 networks using the same LTE base stations as used in this study. Field measurements have been carried out in different propagation environments. In analyses, user application throughput and MIMO utilization have been studied to demonstrate the efficiency of each mode.,2016-10-19 16:11:19,下载2次
Ergodic-capacity-.rar - When the channel is time-varying channel capacity has multiple definitions, depending on what is
known about the channel state or its distribution at the transmitter and/or receiver. These definitions
have different operational meanings. Specifically, when the instantaneous channel gains, also called the
channel state information (CSI), are known perfectly at both transmitter and receiver, the transmitter can
adapt its transmission strategy (rate and/or power) relative to the instantaneous channel state.,2016-07-09 02:38:32,下载5次
Capacity-limits-on-MIMO.rar - Much of the initial excitement about MIMO systems
was due to pioneering work by Winters [132], Foschini [29], and Telatar [113] predicting remarkable
capacity growth for wireless systems with multiple antennas when the channel exhibits rich scattering
and its variations can be accurately tracked. This initial promise of exceptional spectral efficiency almost
“for free” resulted in an explosion of research and commercial activity to characterize the theoretical
and practical issues associated with MIMO systems.,2016-07-09 02:35:37,下载1次
Mimo_Transmission_Schemes_for_LTE_and_HSPA_Networ - The challenge for RF engineers is mainly to
understand the complex systems starting
with the transmitter and ending with the
receiver. It is not enough to investigate only
single components of the communications
link. The antennas are an integral part of the
MIMO system. MIMO systems exploit the
multipath structure of the propagation
channel.,2016-07-05 00:41:43,下载1次
LTE-MIMO-System-Level-Design.rar - New deployments are needed to address the
future needs of 4G networks like high data rate
support for clustered users. As a result, there is
a shift in paradigm for MIMO increasing
the number of antennas at a single cell site to
distributing multiple antennas over a cell area.
Furthermore, such distributed antennas may be
in different power levels, and also in different
antenna configurations. These add an interesting
aspect and require scalable designs as well as
interference management as part of MIMO
improvements. Geographically separated antennas
implemented as remote radio heads can be
controlled by a centrally located baseband unit
using high-speed standardized fiber interfaces.
Such low-latency fiber interfaces ensure good
synchronization across antennas and make the
transmission distributed antennas as a natural
extension of MIMO.,2016-07-05 00:21:22,下载6次
energy_2012_2_30_40107.rar - From the figure, we observe that the performance
gap between ideal and realistic feedback
is much more pronounced for MU-MIMO compared
to SU-MIMO, which illustrates the
increased sensitivity of MU-MIMO with respect
to CSI accuracy. This is due to the fact that
more accurate CSI feedback helps to improve
the accuracy with which interference nulling can
be performed at the eNB and to better predict
the MU-CQIs, which are crucial for multi-user
scheduling [7]. While Fig. 1 sheds light on the
benefits that may be achieved with improved
CSI feedback accuracy, in practice a tradeoff
between improving downlink performance and
increasing uplink overhead needs to be struck.
In Rel-10, increasing the granularity of the feedback
codebooks was discussed but no agreement,2016-07-04 23:41:28,下载14次
MIMO-performance.rar - MU-MIMO is widely considered a key technology
for system capacity improvement in modern
wireless networks. In contrast to
SU-MIMO, where the spatial multiplexing gain
is confined to a single user, MU-MIMO allows
multiple users to be co-scheduled on the same
time-frequency resources to exploit this gain
among two or more UE units. This is particularly
beneficial as high-rank SU-MIMO transmission
is often limited by the number of
antennas and antenna design constraints at the
user end, whereas high-rank transmission using
MU-MIMO is more feasible due to the scattered
user distribution.
It is well known that the information theoretic
optimal MU-MIMO scheme is dirty paper
coding (DPC), which unfortunately is a nonlinear/
non-causal beamforming scheme and therefore
unrealistic in real-life applications. From a
practical deployment point of view, the most,2016-07-04 23:28:57,下载5次
Downlink-MIMO-in-LTE-Advanced-SU-MIMO-vs-MU-MIMO. - CSI feedback allows downlink transmission
to be adaptively optimized based on the
instantaneous DL channel, so that closedloop
beamforming and adaptive link adaptation
can be enabled to optimize the system
performance. The DL reference signal used
for CSI measurement is different in Rel-8
and Rel-10. In Rel-8, CSI measurement is
based on CRS, which is also used for data
demodulation. In contrast, CSI measurement
in Rel-10 is based on a set of newly introduced
CSI-RS signals, which is low-dutycycle
and low-density, and allows a higher
reuse factor than Rel-8 CRS.,2016-07-04 23:26:36,下载9次
Antenna-Configurations-for-4X4-MIMO-in-LTE-Field- - Multiple Input Multiple Outputs, a wireless or radio communications technology normally used with OFDM for many wireless and radio communications. Multiple-input multiple-output, or MIMO, is a radio communications technology or RF technology that is being mentioned and used in many new technologies these days. Wi-Fi, LTE (3G long term evolution) and many other radio, wireless and RF technologies are using the new MIMO wireless technology to provide increased link capacity and spectral efficiency combined with improved link reliability using what were previously seen as interference paths. Even now many there are many MIMO wireless routers on the market, and as this RF technology is becoming more widespread, more MIMO routers and other items of wireless MIMO equipment will be seen.,2016-07-04 23:23:05,下载4次
122402596-mimo.rar - Multiple Input Multiple Outputs, a wireless or radio communications technology normally used with OFDM for many wireless and radio communications. Multiple-input multiple-output, or MIMO, is a radio communications technology or RF technology that is being mentioned and used in many new technologies these days. Wi-Fi, LTE (3G long term evolution) and many other radio, wireless and RF technologies are using the new MIMO wireless technology to provide increased link capacity and spectral efficiency combined with improved link reliability using what were previously seen as interference paths. Even now many there are many MIMO wireless routers on the market, and as this RF technology is becoming more widespread, more MIMO routers and other items of wireless MIMO equipment will be seen.,2016-07-04 23:19:49,下载3次
090321_LTE_measurement_A4_MForum.rar - • demonstrate that LTE works in a
stable way and to prove the radio
link performance assumptions
under realistic initial LTE
deployment scenarios in typical
suburban/urban campus and wide
area environments
• demonstrate that LTE delivers high
transmission performance at the
cell edge and to show which data
rates can be achieved there by
using suitable antenna heights and
near line of sight (LOS) propagation
conditions in urban areas
• explore achievable throughput
rates in a single and multi-user
environment, both outdoors and
inside buildings
• verify the optimal scheduler
behavior of LTE base stations for
mixed QoS scenarios under
various channel conditions,2016-07-04 23:11:33,下载3次