Low-Complexity Adaptive Detector in Single-User MIMO System

Background:Single user Massive Multiple Input Multiple Output (MIMO) can be used to increase the spectral efficiency since the data is transmitted simultaneously from a large number of antennas located at both the base station and mobile. It is feasible to have a large number of antennas in the mobile, in the millimeter wave frequencies. However, the major drawback of single user massive MIMO is the high complexity of data recovery at the receiver.Methods:In this work, we propose a low complexity method of data detection with the help of re-transmissions. A turbo code is used to improve the Bit-Error-Rate (BER).Results and Conclusion:Simulation results indicate a significant improvement in BER with just two re-transmissions as compared to the single transmission case. We also show that the minimum average SNR per bit required for error-free propagation over a massive MIMO channel with re-transmissions is identical to that of the Additive White Gaussian Noise (AWGN) channel, which is equal to -1.6 dB.

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Performance Analysis of Low Complexity Multiuser Scheduling Algorithms in MIMO System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.392.867 ◽

2013 ◽

Vol 392 ◽

pp. 867-871

Author(s):

Ming Xia Lv ◽

Yan Kun Lai ◽

Dong Tang

Keyword(s):

Mimo System ◽

Scheduling Algorithm ◽

Low Complexity ◽

Base Station ◽

User Scheduling ◽

Sum Capacity ◽

Multiuser Scheduling ◽

The Common ◽

The Cost ◽

Selection Algorithms

The total throughput of the communication system can be maximized by allocating the common radio resource to the user or the user group having the best channel quality at a given time and the multiuser diversity gain can be obtained when multiple users share the same channel at one time. The object to select the users is to select the users with the maximum sum capacity. As for a scheduling algorithm, exhaustive algorithm can get the largest capability of the system by multi-user scheduling. However, this algorithm is quite complex hence the cost of operation to a base station has substantial increased. We compare the multiuser performance of two fast user selection algorithms with low complexity in MIMO-MRC systems with co-channel interferences. From the simulation results, these two algorithms not only decrease the computational complexity of the scheduling algorithm but also retain large capability of the MIMO system.

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Precoding for Multiuser MIMO

Developments in Wireless Network Prototyping, Design, and Deployment ◽

10.4018/978-1-4666-1797-1.ch007 ◽

2012 ◽

pp. 130-156 ◽

Cited By ~ 1

Author(s):

Elsadig Saeid ◽

Varun Jeoti ◽

Brahim Belhaouari Samir

Keyword(s):

Mimo Systems ◽

Mimo System ◽

Multiple Input Multiple Output ◽

Achievable Rate ◽

Multiple Access Channels ◽

Multiple Input ◽

Input Multiple Output ◽

Single User ◽

A New Technique ◽

Improved Technique

Future Wireless Networks are expected to adopt multi-user multiple input multiple output (MU-MIMO) systems whose performance is maximized by making use of precoding at the transmitter. This chapter describes the recent advances in precoding design for MU-MIMO and introduces a new technique to improve the precoder performance. Without claiming to be comprehensive, the chapter gives deep introduction on basic MIMO techniques covering the basics of single user multiple input multiple output (SU-MIMO) links, its capacity, various transmission strategies, SU-MIMO link precoding, and MIMO receiver structures. After the introduction, MU-MIMO system model is defined and maximum achievable rate regions for both MU-MIMO broadcast and MU-MIMO multiple access channels are explained. It is followed by critical literature review on linear precoding design for MU-MIMO broadcast channel. This paves the way for introducing an improved technique of precoding design that is followed by its performance evaluation.

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