Digital Mobile and Wireless Communications - Radio Interface for 4G/LTE, IMT-Advanced, 5G
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The goal of this course is to introduce the participant to those digital modulation methods, coding techniques, space, time and frequency diversity techniques and multiple access techniques presently in use or being considered for use in mobile wireless and/or broadband wireless communication systems (many of these techniques are also used in satellite, wireline, and power-line communications).
4G-LTE- Fourth Generation systems based on OFDMA have been in commercial use for some time. Now industry is moving toward the standard for 5G, Fifth Generation Systems. We will discuss some concepts being considered for 5G including HetNets and FTN "Faster Than Nyquist Signaling"
Orthogonal Frequency Division Multiplexing (OFDM) techniques are used in almost all of the new broadband wireless and mobile wireless access systems, e.g., 3G-LTE, 4G-LTE, 5G, IEEE802.11a,g and n (Wi-Fi), Wi-Gig (60 GHz), IEEE 802.16e (Wi-Max and "Mobile" Wi-Max), the WiMedia Alliance, IEEE 802.15 and IEEE 802.22 Standard.
The OFDM techniques consist of OFDM, OFDMA, and SC-FDMA. These systems use MIMO and advanced coding concepts, as well carrier aggregation techniques to improve performance. We will cover all of these topics during the course. We will also describe relatively new concepts such as massive MIMO. We will discuss the very important DMT implementation of the OFDM modulations.
We will also study the modulations and multiple access techniques (including CDMA and WCDMA) in use in present Second and Third-Generation systems including the (UMTS) IMT-2000 Third Generation Mobile Systems.
In addition to the OFDM-based modulations mentioned above, we will discuss QAM, QPSK, MPSK, PAM and continuous phase modulations (CPM), e.g., GMSK. All of these modulations are being used in wireless, satellite and wireline communication systems.
We will devote much time to the subject of MIMO (Multiple-Input Multiple-Output) antenna systems. This technique has been introduced in modern broadband wireless communications. We will also describe some recent ideas such as massive MIMO.
As previously mentioned, we will discuss the coding techniques used in the mobile/wireless broadband systems, including convolutional coding, turbo-coding and iterative decoding techniques. The idea of combining MIMO antenna arrays with OFDM, and coding, is an attractive idea for present and future broadband and mobile wireless systems.
In addition to all of the above, we will also devote time to a discussion of the bounds, or limits, on communications based on Shannon’s Information Theory. It is Shannon’s work, which has led to breakthroughs in coding, OFDM (multitone) communications, MIMO and much more.
At the end of the course, we will also describe the now classic multiple access techniques, e.g., CDMA, WCDMA, FDMA, and TDMA, used in the physical or radio interfaces of mobile wireless and broadband wireless systems. We will include a discussion of the radio interfaces of IS-95 and WCDMA, including topics such as Walsh codes and OVSF codes, the RAKE receiver, pseudo-random sequences, intra-cell and intercell interference, Gold codes and synchronization techniques.
Upon completing the course you will be able to:
- Understand multiple access techniques such as OFDMA, the multiple access technique used in broadband wireless access, 4G/LTE and 5G mobile systems.
- Understand MIMO, Massive MIMO, and MU-MIMO concepts and how they are used to greatly improve bandwidth efficiency for wireless communications.
- Analyze new techniques to improve communications efficiency, such as adaptive modulation and coding techniques, OFDM, space-time coding and iterative techniques.
- Evaluate the performance of modulations on channels with Rayleigh fading, and the diversity techniques used to overcome degradation caused by fading.
- Analyze different modulations and multiple access techniques, on the basis of detectability, bandwidth and complexity of implementation
- Understand constant envelope CPM modulations such as GMSK, used in the GSM, GPRS, Bluetooth, and EDGE systems.
- describe the latest and future commercial wireless systems and understand the underlying technologies that have been selected to implement them.
This course will be of interest to hardware, software and systems engineers who are entering the field of communication systems, or experienced engineers who are not familiar with modern modulations and concepts. The course participant should have some familiarity with the Fourier Transform and the topic of probability. An electrical engineering background (BSEE or equivalent practical experience) is recommended.