scholarly journals Design Trade-offs for Decentralized Baseband Processing in Massive MU-MIMO Systems

2019 ◽  
Author(s):  
Kaipeng Li ◽  
James McNaney ◽  
Chance Tarver ◽  
Oscar Castaneda ◽  
Charles Jeon ◽  
...  
Keyword(s):  
Mimo Systems ◽  
Trade Offs ◽  
Baseband Processing

scholarly journals High Throughput Line-of-Sight MIMO Systems for Next Generation Backhaul Applications

Frequenz ◽  
2017 ◽  
Vol 71 (9-10) ◽  
pp. 389-398
Author(s):  
Xiaohang Song ◽  
Darko Cvetkovski ◽  
Tim Hälsig ◽  
Wolfgang Rave ◽  
Gerhard Fettweis ◽  
...  
Keyword(s):  
High Throughput ◽  
Mimo Systems ◽  
Next Generation Networks ◽  
Line Of Sight ◽  
60 Ghz ◽  
Channel Measurements ◽  
Next Generation ◽  
Wireless Backhaul ◽  
Baseband Processing ◽  
Theoretical Foundations

Abstract The evolution to ultra-dense next generation networks requires a massive increase in throughput and deployment flexibility. Therefore, novel wireless backhaul solutions that can support these demands are needed. In this work we present an approach for a millimeter wave line-of-sight MIMO backhaul design, targeting transmission rates in the order of 100 Gbit/s. We provide theoretical foundations for the concept showcasing its potential, which are confirmed through channel measurements. Furthermore, we provide insights into the system design with respect to antenna array setup, baseband processing, synchronization, and channel equalization. Implementation in a 60 GHz demonstrator setup proves the feasibility of the system concept for high throughput backhauling in next generation networks.

scholarly journals Decentralized Baseband Processing for Massive MU-MIMO Systems

2017 ◽  
Vol 7 (4) ◽  
pp. 491-507 ◽  
Author(s):  
Kaipeng Li ◽  
Rishi R. Sharan ◽  
Yujun Chen ◽  
Tom Goldstein ◽  
Joseph R. Cavallaro ◽  
...  
Keyword(s):  
Mimo Systems ◽  
Baseband Processing

TECHNOLOGICAL APPROACH TO SOLVING THE PROBLEM OF MINIMIZING THE INFLUENCE OF DESTABILIZING FACTORS ON THE WORK OF DISTRIBUTED STRUCTURES OF THE GROUND-ROCKOTECHNICAL COMPLEX IN AN INTEGRAL PROJECT «OBJECT-SYSTEM»

2019 ◽  
pp. 5-19
Author(s):  
V. Chepkyi ◽  
V. Skachkov ◽  
O. Yefymchykov ◽  
V. Nabok ◽  
O. Yelchaninov
Keyword(s):  
Control System ◽  
Information Exchange ◽  
Mimo Systems ◽  
Information Control ◽  
Radio Communication ◽  
External Interference ◽  
Object System ◽  
Trade Offs ◽  
Destabilizing Factors ◽  
Distributed Structures

Mobile structures of the ground-based robotic complex (RTC) are investigated as an active component formation of an integrated project “object-system”, which is operated in a destabilizing environment. The relevant problem of minimizing the influence of external destabilizing factors on the operation of mobile spatially-distributed structures of the ground-based RTC is stated in the descriptions of the conceptual apparatus of complex, poorly formalized multicomponent technical systems. Following the logic of this approach, the basic principles of distributed control are determined and their applications are implemented in the mobile structures of the ground-based RTC with elements of subsidiarity. The quintessence of the latter is represented by the technology of multi-antenna MIMO systems, which made it possible to determine the trade-offs of using classical transmission methods and strategies for receiving and processing MIMO signals in the multi-sensory channels of the information-control system (ICS) and radio communication with the data transmission system and commands. Given the complexity of performing the stated tasks, a set of technological functions of reducing the influence of destabilizing factors and their practical variations in the algorithms for obtaining the target result are proposed. A situational model of reducing (minimizing) information losses at the output of the information-control system of the ground-based robotic complex under destabilization has been built. Options have been proposed to achieve the target result: integration of structural and parametric adaptation methods, MIMO technologies, code division multiplexing techniques with CDMA channels, taking into account the heterogeneity factor of information exchange channels and the artificial redundancy of the system itself with respect to the number of external interference sources.

EVALUATION FRAMEWORK FOR K-BEST SPHERE DECODERS

2010 ◽  
Vol 19 (05) ◽  
pp. 975-995 ◽  
Author(s):  
CHUNG-AN SHEN ◽  
AHMED M. ELTAWIL ◽  
KHALED N. SALAMA
Keyword(s):  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Evaluation Framework ◽  
Practical Implementation ◽  
Holistic View ◽  
Power Cost ◽  
Sphere Decoder ◽  
Advantages And Disadvantages ◽  
Trade Offs ◽  
Power Delay Product

While Maximum-Likelihood (ML) is the optimum decoding scheme for most communication scenarios, practical implementation difficulties limit its use, especially for Multiple Input Multiple Output (MIMO) systems with a large number of transmit or receive antennas. Tree-searching type decoder structures such as Sphere decoder and K-best decoder present an interesting trade-off between complexity and performance. Many algorithmic developments and VLSI implementations have been reported in literature with widely varying performance to area and power metrics. In this semi-tutorial paper we present a holistic view of different Sphere decoding techniques and K-best decoding techniques, identifying the key algorithmic and implementation trade-offs. We establish a consistent benchmark framework to investigate and compare the delay cost, power cost, and power-delay-product cost incurred by each method. Finally, using the framework, we propose and analyze a novel architecture and compare that to other published approaches. Our goal is to explicitly elucidate the overall advantages and disadvantages of each proposed algorithms in one coherent framework.

scholarly journals Low Complexity Hybrid Precoding Designs for Multiuser mmWave/THz Ultra Massive MIMO Systems

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6054
Author(s):  
João Pedro Pavia ◽  
Vasco Velez ◽  
Renato Ferreira ◽  
Nuno Souto ◽  
Marco Ribeiro ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Massive Mimo ◽  
Communication Systems ◽  
High Speed ◽  
Mimo Systems ◽  
Low Complexity ◽  
Phase Shifters ◽  
High Signal ◽  
Design Algorithm ◽  
Trade Offs

Millimeter-wave and terahertz technologies have been attracting attention from the wireless research community since they can offer large underutilized bandwidths which can enable the support of ultra-high-speed connections in future wireless communication systems. While the high signal attenuation occurring at these frequencies requires the adoption of very large (or the so-called ultra-massive) antenna arrays, in order to accomplish low complexity and low power consumption, hybrid analog/digital designs must be adopted. In this paper we present a hybrid design algorithm suitable for both mmWave and THz multiuser multiple-input multiple-output (MIMO) systems, which comprises separate computation steps for the digital precoder, analog precoder and multiuser interference mitigation. The design can also incorporate different analog architectures such as phase shifters, switches and inverters, antenna selection and so on. Furthermore, it is also applicable for different structures, namely fully-connected structures, arrays of subarrays (AoSA) and dynamic arrays of subarrays (DAoSA), making it suitable for the support of ultra-massive MIMO (UM-MIMO) in severely hardware constrained THz systems. We will show that, by using the proposed approach, it is possible to achieve good trade-offs between spectral efficiency and simplified implementation, even as the number of users and data streams increases.

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