Description: 研究了单基站功率约束条件下的多点协作多输入单输出干扰下行链路系统的和速率最大化非凸优化问
题。为有效求解和速率最大化优化问题，首先采用分层优化方法将和速率最大化优化问题分解成发射功率最小
化优化问题和单输入单输出干扰信道的和速率最大化优化问题 其次利用二阶锥规划优化方法求解发射功率最
小化优化问题 然后利用凸近似和几何规划方法求解单输入单输出干扰信道的和速率最大化优化问题 最后通
过交替求解这两个子优化问题，进而提出了一种新颖的单调协同多点波束成形算法 而且利用单有界序列原理
证明了所提算法的收敛性。数值仿真表明所提算法只需约四次迭代即可收敛到稳定点，而且所获得的最优性能
非常接近穷举搜索算法的最优性能。-Single base station power constraints under the multi-point collaboration and the rate of multiple-input single-output interference downlink system to maximize non-convex optimization problem. For maximizing the effective solving and rate optimization problem, first hierarchical optimization method to maximize the rate optimization problem into minimum transmit power optimization problem and the single-input single-output interference channel and rate maximization optimization problem Secondly, the second-order cone programming optimization method for solving the minimum transmit power optimization problem then using convex approximation and geometric programming method for single-input single-output interference channel and maximizing the rate optimization problem Finally, by alternately solving the two sub-optimization problems, and then put forward a novel monotonous collaborative multi-beamforming algorithm and the use of single-, bounded sequence principle that the convergence Platform: |
Size: 684032 |
Author:李腾飞 |
Hits:
Description: tgrr yggg ggg yttt
Space time block coding (STBC) and beamforming
techniques are two emerging technologies that can be
employed at base station with multiple antenna to provide
transmit diversity and beamforming gain to increase signal-to-
noise ratio (SNR) of the downlink. STBC utilizes a diversity
antenna system where the antenna spacing is usually required
to be large enough, say 10 times wavelength of the carrier for
a uniform linear array (ULA) in small angular spread
environments, to obtain low-correlation/independent fading
channels. While the beamforming antenna needs to achieve
spatial directivity and the signals received at and/or
transmitted from all antennas must be correlated or coherent.
So the antenna spacing should usually be very small, e.g. half
wavelength for ULA.
-tgrr ygggggggggggg ytttttt
Space time block coding (STBC) and beamforming
techniques are two emerging technologies that can be
employed at base station with multiple antenna to provide
transmit diversity and beamforming gain to increase signal-to-
noise ratio (SNR) of the downlink. STBC utilizes a diversity
antenna system where the antenna spacing is usually required
to be large enough, say 10 times wavelength of the carrier for
a uniform linear array (ULA) in small angular spread
environments, to obtain low-correlation/independent fading
channels. While the beamforming antenna needs to achieve
spatial directivity and the signals received at and/or
transmitted from all antennas must be correlated or coherent.
So the antenna spacing should usually be very small, e.g. half
wavelength for ULA.
Platform: |
Size: 1024 |
Author:rashi |
Hits:
Description: Space time block coding (STBC) and beamforming
techniques are two emerging technologies that can be
employed at base station with multiple antenna to provide
transmit diversity and beamforming gain to increase signal-to-
noise ratio (SNR) of the downlink. STBC utilizes a diversity
antenna system where the antenna spacing is usually required
to be large enough, say 10 times wavelength of the carrier for
a uniform linear array (ULA) in small angular spread
environments, to obtain low-correlation/independent fading
channels. While the beamforming antenna needs to achieve
spatial directivity and the signals received at and/or
transmitted from all antennas must be correlated or coherent.
So the antenna spacing should usually be very small, e.g. half
wavelength for ULA.
Platform: |
Size: 3387392 |
Author:rashi |
Hits:
Description: Space time block coding (STBC) and beamforming
techniques are two emerging technologies that can be
employed at base station with multiple antenna to provide
transmit diversity and beamforming gain to increase signal-to-
noise ratio (SNR) of the downlink. STBC utilizes a diversity
antenna system where the antenna spacing is usually required
to be large enough, say 10 times wavelength of the carrier for
a uniform linear array (ULA) in small angular spread
environments, to obtain low-correlation/independent fading
channels. While the beamforming antenna needs to achieve
spatial directivity and the signals received at and/or
transmitted from all antennas must be correlated or coherent.
So the antenna spacing should usually be very small, e.g. half
wavelength for ULA.
Platform: |
Size: 3018752 |
Author:rashi |
Hits:
Description: In a multiple transmit antenna, single antenna per receiver downlink channel with limited channel state feedback, we consider the following question: given a constraint on the total system-wide feedback load, is it referable to get low-rate/coarse channel feedback from a large number of receivers or high-rate/high-quality feedback from a smaller number of receivers? Acquiring feedback from many receivers allows multi-user diversity to be exploited, while high-rate feedback allows
for very precise selection of beamforming directions. We show that there is a strong preference for obtaining high-quality feedback, and that obtaining near-perfect channel information from as many receivers as possible provides a significantly larger sum rate than collecting a few feedback bits from a large number of users. Platform: |
Size: 2106368 |
Author:xinpha |
Hits:
Description: If SDMA is used on the downlink of a multi-user MIMO system,
either long-term or short-term channel state information
has to be available at the base station (BS) to faciliate the joint
precoding of the signals intended for the different users. Precoding
is used to efficiently eliminate or suppressmulti-user interference
(MUI) via beamforming or by using ”dirty-paper”
codes. It also allows us to performmost of the complex processing
at the BS which leads to a simplification of the mobile terminals.
In this paper, we provide an overview of efficient linear
and non-linear precoding techniques formulti-userMIMO
systems. The performance of these techniques is assessed via
simulations on statistical channelmodels, and on channels generated
by the IlmProp, a geometry-based channel model that
generates realistic correlations in space, time, and frequency. Platform: |
Size: 74752 |
Author:ImranKhan |
Hits:
Description: 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. Platform: |
Size: 161792 |
Author:nebiyu |
Hits:
Description: TD-LTE中的下行波束复兴的beamforming函数，具体模型参看TS36.104协议-beamforming function in the downlink beam revival TD-LTE, reference model specific protocol TS36.104 Platform: |
Size: 1024 |
Author:Wuyou |
Hits:
Description: Millimeter wave (mmWave) systems will likely employ directional beamforming with large antenna arrays at both the
transmitters and receivers. Acquiring channel knowledge to
design these beamformers, however, is challenging due to the
large antenna arrays and small signal-to-noise ratio before
beamforming. In this paper, we propose and evaluate a downlink system operation for multi-user mmWave systems based
on compressed sensing channel estimation and conjugate
analog beamforming. Adopting the achievable sum-rate as a
performance metric, we show how many compressed sensing
measurements are needed to approach the perfect channel
knowledge performance. Platform: |
Size: 1032192 |
Author:hadjidw |
Hits:
Search - downlink beamforming