- Training method:
- Open / Scheduled
- 3 days
- Guide price:
- Euros 2,410 (excl. VAT)
OFDM / OFDMA Advanced training course
OFDM / OFDMA Advanced training course describes all aspects of the operation of radio interfaces based upon OFDM and OFDMA technology.
The OFDM / OFDMA course commences by detailing the radio signal propagation phenomena present over transmission paths.
Having covered these basics, the OFDM / OFDMA Advanced training looks in depth at the operation for OFDM and OFDMA. The major advantages of OFDM / OFDMA are explained along with the ways available to use them effectively. These include topics such as algorithms for adaptive subcarrier assignment, modulation, power control, etc..
The next phase of the OFDM / OFDMA training course looks at two key families of DSP algorithms: methods for synchronization; and channel estimation and correction. Next, methods of incorporating OFDM / OFDMA-based radio interface into wireless access network is detailed with particular focus on methods to control co-channel interference.
The course then moves on to detail how OFDM / OFDMA can be combined with multiple antennas systems.
The training course finishes by looking at a comparison of various contemporary OFDM / OFDMA systems.
This OFDM / OFDMA Advanced training course is developed for telecom professionals working with hardware and software development, implementation, system engineering, testing and verification, as well as product and project management.
OFDM / OFDMA Advanced training course contents
Digital Communications Introduction
Review of single-carrier digital modulation and mapping schemes
Review of TDMA and FDMA multiple access schemes
Spread spectrum transmission and CDMA
General model of a digital communications system
Radio Signal Propagation Basics
Time, frequency and space diversity
Large-scale and small-scale propagation effects
Path losses, shadowing, Rayleigh, Rician fading
Inter-symbol interference and possible countermeasures
Principles of OFDM
Serial vs. parallel multicarrier transmission
Block model of an OFDM modem including transmitter and receiver
IFFT/FFT functionality and practical implementation
Determination of the key OFDM parameters
Structure of the OFDM symbol
Sub-carrier orthogonality and spacing; OFDM signal spectrum
Cyclic Prefix (CP), linear and circular convolution, impact on equalization
Peak-to-average power ratio of RF signal – its affects and solution
Time-domain and frequency-domain OFDM signal representation
OFDMA as a scheme extending OFDM
Multi-user diversity benefits
Adaptive subcarrier allocation; adaptive allocation of time and frequency resources
Adaptive modulation and coding for OFDMA systems
Example scheduling approaches and MAC protocols
Summary of adavantages and disadvantages of OFDMA
Classification and characterization of synchronization offsets: Carrier Frequency Offset (CFO), Carrier Phase Offset (CPO), symbol timing offset and sampling clock offset
Time-domain or frequency-domain estimation and correction of synchronization offsets
Review of symbol timing synchronization methods including algorithms based on CP
Review of carrier frequency synchronization methods including algorithms based on pilots
Sampling rate synchronization methods
OFDM/OFDMA Channel Estimation and Correction
Review of pilot types and preambles (block, comb, mixed, grid)
Requirements for minimal pilot separation in the time and in the frequency domain
Structure of OFDM/OFDMA channel estimator and corrector
Basic channel correction schemes: zero-forcing and MMSE equalizer
Use of Multiple Antennas in OFDM/OFDMA
Fundamentals of multiple-antennas
Review of multiple-antenna methods, including: transmit diversity, spatial multiplexing, single-user and multi-user MIMO, beamforming
MIMO schemes without feedback (open-loop) and with feedback (closed-loop)
Combination of MIMO and OFDM/OFDMA
Scheduling of 3-dimensional resource grid (time, frequency and space)
Channel estimation and pilots for MIMO/OFDM/OFDMA
Methods combining STBC and OFDM
Methods combining SFBC and OFDM
Methods combining Spatial Multiplexing and Beamforming with OFDM
Review of co-channel interference management schemes
Interference randomization, avoidance, cancellation and coordination
Single Frequency Network (SFN) concept in OFDM/OFDMA-based systems
Full reuse of one
Integer and fractional frequency reuse
Co-channel interfaces comparison between FDD and TDD
Review of Contemporary Systems Applying OFDM/OFDMA
3GPP-LTE Rel 8 and 9
3GPP-LTE Rel 10 (LTE Advanced)
WiMAX (IEEE 802.16d and 802.16e)
Broadcasting (DAB, DVB)
In order to gain the most from the OFDM / OFDMA Advanced training course it is recommended that attendees have a general knowledge about the architecture, terminology and modes of operation of the GSM/UMTS Radio Access Network. A general knowledge of broadband access systems (such as WiMAX, 3GPP-LTE), radio propagation and signal processing is also useful.
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