scholarly journals Capacity of fully correlated MIMO system using character expansion of groups

2005 ◽  
Vol 2005 (15) ◽  
pp. 2461-2471 ◽  
Author(s):  
Ejaz Khan ◽  
Conor Heneghan
Keyword(s):  
Antenna Arrays ◽  
Rayleigh Fading ◽  
Mimo Systems ◽  
Mimo System ◽  
Mimo Channel ◽  
Communication Link ◽  
Channel State ◽  
State Information ◽  
Perfect Channel State Information ◽  
Propagation Medium

It is well known that the use of antenna arrays at both sides of communication link can result in high channel capacities provided that the propagation medium is rich scattering. In most previous works presented on MIMO wireless structures, Rayleigh fading conditions were considered. In this work, the capacity of MIMO systems under fully correlated (i.e., correlations between rows and columns of channel matrix) fading is considered. We use replica method and character expansions to calculate the capacity of correlated MIMO channel in closed form. In our calculations, it is assumed that the receiver has perfect channel state information (CSI) but no such information is available at the transmitter.

scholarly journals Optimization of Sparse Learning Problem of Signals on Hybrid mm-Wave MIMO Systems using Sparse Coding based Reconstruction Learning Mechanism

2021 ◽  
Vol 15 ◽  
pp. 713-721
Author(s):  
M., Sunil Kumar ◽  
C. K., Narayanappa ◽  
M. Nagendra Kumar
Keyword(s):  
Millimeter Wave ◽  
Channel State Information ◽  
Sparse Coding ◽  
Mimo Systems ◽  
Mimo System ◽  
Sparse Learning ◽  
Learning Problem ◽  
Channel State ◽  
State Information ◽  
Wave Technology

Researchers and industry experts are looking for the availability of large bandwidth spectrum due to high market demands and expectations for high data rates. And Millimeter Wave technology possess characteristics to fulfill these requirements. However, due to high power consumption and channel estimation requirements, massive MIMO is utilized in coordination with Millimeter Wave technology. Besides, the performance of mm-WAVE MIMO system is measured by the effective estimation of Channel State Information (CSI) which is a critical and challenging process. Therefore, a Sparse Coding based Reconstruction Learning (SCL) mechanism is presented to efficiently estimate Channel State Information (CSI) for Millimeter-WAVE massive Multiple Input Multiple Output (MIMO) system. For efficiency enhancement, joint sparse learning problem is formulated and a denoised joint sparsity learning matrix is obtained using proposed SCL mechanism. Here, optimization of joint sparse learning problem is summarized by reducing inconsistent and overfitting errors. The proposed SCL mechanism performs well under high as well as low SNR conditions. Moreover, joint sparse coding algorithm is utilized for efficient sparse signal restoration. The performance of proposed SCL mechanism is efficiently measured against several state-of-art-algorithms in terms of energy efficiency, NMSE, channel capacity etc.

scholarly journals Realistic antenna modeling for MIMO systems in microcell scenarios

2005 ◽  
Vol 2 ◽  
pp. 141-146
Author(s):  
C. Waldschmidt ◽  
C. Kuhnert ◽  
T. Fügen ◽  
W. Wiesbeck
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Mimo Systems ◽  
Mimo System ◽  
Cellular Systems ◽  
Handheld Devices ◽  
Communication Link ◽  
Cellular Phones ◽  
Power Budget ◽  
Spaced Antennas

Abstract. This paper shows the potential of MIMO in cellular systems, where small handheld devices are used for the terminals. A complete model of a MIMO communication link is used to integrate accurate antenna modelling into MIMO system simulations. All different effects of mutual coupling between closely spaced antennas are considered. The efficiency or power budget respectively of the antenna arrays in the terminals, which are influenced by mutual coupling effects, is taken into account. Capacity simulation results based on a channel obtained from ray-tracing simulations are shown with cellular phones with up to three Inverted-F antennas.

scholarly journals INVESTIGATION OF CAPACITY GAINS IN MIMO CORRELATED RICIAN FADING CHANNELS SYSTEMS

2013 ◽  
pp. 76-83
Author(s):  
NIRAV D. PATEL ◽  
VIJAY K. PATEL ◽  
DHARMESH SHAH
Keyword(s):  
Fading Channels ◽  
Antenna Arrays ◽  
Power Distribution ◽  
Mimo Systems ◽  
Rician Fading ◽  
Communication Link ◽  
Mimo Channels ◽  
Rician Fading Channel ◽  
Propagation Medium ◽  
Diversity Gains

This paper investigate the effect of Rician fading and correlation on the capacity and diversity of MIMO channels. The use of antenna arrays at both sides of the wireless communication link (MIMO systems) can increase channel capacity provided the propagation medium is rich scattering or Rayleigh fading and the antenna arrays at both sides are uncorrelated. However, the presence of line-of-sight (LOS) component and correlation of real world wireless channels may affect the system performance. Along with that we also investigate power distribution methods for higher capacity gains and effect of CSI at the transmitter on the capacity for range of SNR. Our investigation follows capacity gain as function of number of antennas and signal-to-noise (SNR) power ratio Block and frequency nonselective Rician fading channel is assumed, and the effect of Rician factor (L) and the correlation parameter (ρ) on the capacity and diversity gains of MIMO channels are found. Index.

Improved Port Modulation for Multiuser Massive MIMO Systems

2015 ◽  
Vol 7 (4) ◽  
pp. 15-25
Author(s):  
Yujiao He ◽  
Jianing Zhao ◽  
Lijuan Tao ◽  
Fuyu Hou ◽  
Wei Jia
Keyword(s):  
Massive Mimo ◽  
Mimo Systems ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Channel State ◽  
State Information ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Simulation Results ◽  
Csi Feedback

This paper proposes an improved port modulation (PM) method which can be applied to the multiuser (MU) massive multiple-input multiple-output (MIMO) system. The precoding process of the improved PM can be divided into two parts: port precoding and MU precoding. The methods of the precoding and detection are provided and the performance of the proposed improved PM is simulated and analyzed. Simulation results show that the proposed improved PM system can achieve a satisfying bit error rate (BER) performance with a cutdown channel state information (CSI) feedback.

Capacity of Cognitive Radio with Partial Channel Distribution Information in Rayleigh Fading Environments

Frequenz ◽  
2015 ◽  
Vol 69 (11-12) ◽  
Author(s):  
D. Xu ◽  
Q. Li
Keyword(s):  
Cognitive Radio ◽  
Rayleigh Fading ◽  
Primary User ◽  
Channel Gain ◽  
Channel State ◽  
State Information ◽  
Channel Distribution ◽  
Perfect Channel State Information ◽  
Partial Channel ◽  
Fading Environments

AbstractThis paper investigates the capacity of the secondary user (SU) in a cognitive radio (CR) network in Rayleigh fading environments. Different from existing works where perfect channel state information (CSI) or channel distribution information (CDI) of the interference link from the SU to the primary user (PU) is assumed to be available, this paper assumes that only partial CDI is available. Specifically, we assume the distribution parameter is unknown and estimated from a set of channel gain samples. With such partial CDI, closed-form expressions for the ergodic and outage capacities of the SU are obtained under the transmit power and the interference outage constraints. It is shown that the capacity with partial CDI is not degraded compared to that with perfect CDI if the interference outage constraint is loose. It is also shown that the capacity can be significantly improved by increasing the number of channel gain samples.

scholarly journals Comments and Corrections to “Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information”

2019 ◽  
Author(s):  
Kamal Singh ◽  
Chandradeep Singh
Keyword(s):  
Channel State Information ◽  
Mimo Systems ◽  
Ergodic Capacity ◽  
Mimo Channel ◽  
Multiple Antenna ◽  
Channel State ◽  
State Information ◽  
Multiple Antenna Systems ◽  
Capacity Curves ◽  
Multiple Input

<div>In this correspondence, we correct the ergodic capacity versus SNR curves of the coherent multiple-input</div><div>multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading in the correspondence cited in the title. More importantly, the corrected capacity results present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in in the correspondence cited in the title because of flaws in the capacity curves.</div>

scholarly journals Comments and Corrections to “Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information”

2019 ◽  
Author(s):  
Kamal Singh ◽  
Chandradeep Singh
Keyword(s):  
Channel State Information ◽  
Mimo Systems ◽  
Ergodic Capacity ◽  
Mimo Channel ◽  
Multiple Antenna ◽  
Channel State ◽  
State Information ◽  
Multiple Antenna Systems ◽  
Capacity Curves ◽  
Multiple Input

<div>In this correspondence, we correct the ergodic capacity versus SNR curves of the coherent multiple-input</div><div>multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading in the correspondence cited in the title. More importantly, the corrected capacity results present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in in the correspondence cited in the title because of flaws in the capacity curves.</div>

Sign in / Sign up

Export Citation Format

Share Document