Related Experiment Video
Updated: Dec 11, 2025
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
11.2K
Block Diagonal Hybrid Precoding and Power Allocation for QoS-Aware BDMA Downlink Transmissions
Guanchong Niu1,2,3, Qi Cao1,3, Manon Pun1,2,3
1School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen), Shenzhen 518172, China.
Sensors (Basel, Switzerland)
|August 16, 2020
Summary
This study introduces a novel Beam Division Multiple Access (BDMA) system for multi-user MIMO, reducing radio frequency (RF) chains by grouping data streams before digital precoding. This approach minimizes interference and meets quality of service (QoS) requirements efficiently.
Area of Science:
- Wireless communication systems
- Signal processing for telecommunications
- Information theory
Background:
- Multi-user multiple-input multiple-output (MU-MIMO) systems enable simultaneous data transmission to multiple users.
- Existing hybrid precoding in MU-MIMO typically requires a number of radio frequency (RF) chains equal to or greater than the number of data streams.
- Beam Division Multiple Access (BDMA) offers a method for simultaneous transmission via different beams.
Purpose of the Study:
- To propose a novel BDMA downlink system architecture for MU-MIMO.
- To reduce the number of required RF chains compared to the total number of data streams.
- To optimize system performance by minimizing interference and satisfying user Quality of Service (QoS).
Main Methods:
- A novel BDMA system is proposed by grouping data streams before digital precoding.
- A greedy user grouping algorithm is developed to minimize inter-group interference.
- Two digital precoding approaches are presented to suppress intra-group interference by maximizing Signal-to-Interference-and-Noise Ratio (SINR) and Signal-to-Leakage-and-Noise Ratio (SLNR).
- Power allocation is optimized using the difference of convex functions (D.C.) programming technique to meet QoS requirements.
Main Results:
- The proposed BDMA system effectively requires fewer RF chains than the total number of transmit data streams.
- The devised algorithms successfully minimize inter-group and intra-group interference.
- Power allocation optimization ensures user QoS requirements are met.
- Simulation results validate the effectiveness of the proposed scheme.
Conclusions:
- The novel BDMA system with hybrid precoding offers a more efficient architecture for MU-MIMO.
- The proposed grouping and precoding strategies significantly reduce hardware complexity (RF chains).
- The system demonstrates robust performance in meeting user QoS demands through optimized power allocation.
Related Concept Videos
01:24Fast Decoupled and DC Powerflow
635
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
635
01:20Downsampling
508
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
508
01:16Maximum Power Transfer
706
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
By substituting the entire circuit with...
706
01:22Upsampling
508
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
508
01:23Maximum Power Flow and Line Loadability
504
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
504
01:24The Midpoint Formula
523
In coordinate geometry, determining the central point between two locations is common. This central point, or midpoint, lies exactly halfway along the line segment connecting two points in a two-dimensional space. It has applications in mathematics, physics, engineering, and various planning disciplines.Given two points labeled as A (x1, y1) and B (x2, y2) on a coordinate plane, a straight line segment can be plotted between them. The midpoint, labeled point M, divides this segment into two...
523