Orthogonal Frequency Division Multiplexing or OFDM is a type of signal waveform or modulation technique that offers several benefits for data networks.

  • As a result, OFDM, or Orthogonal Frequency Division Multiplexing is utilized in several i.e. current high-bandwidth, a large rate of data wireless systems, such as Wi-Fi technology, cellular communications, and others.
  • Because OFDM employs a huge proportion of carriers, typically carrying minimal bit rate data; it is very resistant to selective fading, interference effects, and multipath impacts while also delivering excellent spectrum utilization.

We have been in the field of guiding OFDM implementation in MATLAB for about 10 years and so we are very much capable of providing simple block diagrams for OFDM systems and all their functions. In this aspect, we have given the basics steps involved in the OFDM system working below

  • Frequency domain QAM
  • QAM source data are mapped to N orthogonal subcarriers
  • The signal is then sent to the transmitter IFFT
  • In the time domain, it is made as to the sum of sinusoids
    • That is the summation of all the N subcarrier sinusoids
  • After passing through the receiver FFT, it is operated in frequency domain QAM
    • QAM source data are recovered and mapped

With more such details this article provides you with a complete picture of OFDM implementation in MATLAB. First, let us start with OFDM data transmission

Research OFDM Simulation in Matlab Code - Why Choose us for implementation

Data Transmission on OFDM

  • The typical method of delivering data across a radio channel is systematic, one bit at a time.
  • This is based on a single channel, and any interfering distortions on that frequency can cause the entire broadcast to be disrupted. OFDM takes a unique technique to solve this issue. 
  • Within the entire OFDM signal, data is sent in parallel over many carriers.
  • It is divided into parallel substreams with the same total data rate as the original stream, however, symbols are spaced widely apart in time and the total data rate of all substreams is substantially lower.
  • This eliminates symbol interference and enables receiving each signal more precisely while preserving the very same capacity

We have got ample practical research knowledge in OFDM channel estimation techniques incorporating all the characteristics stated here. You can reach out to us for any kind of phd assistance regarding OFDM implementation in MATLAB. What are the key features of OFDM?

Key features of OFDM

  • The information stream is carried by many carriers also known as subcarriers, which are orthogonal in nature. 
  • To reduce channel delaying spread and inter-symbol interference, every symbol has a guard interval attached to it
  • Both the uplink and downlink of the 5G New Radio (NR) standards employ OFDM
  • The NR standard was created with a wide range of options in mind so that it may be used for a wide range of applications
  • There are close to 3300 subcarriers throughout the carrier spacing in the ranges of 15kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, and 480 kHz

OFDM gains an advantage due to such important features. Talk to our research experts who have worked in OFDM systems and their implementation and who have also faced a lot of research issues and solved them with innovative methods. Let us now talk more about the parameters of input and output in implementing OFDM using MATLAB

Result Analysis Parameters for OFDM Implementation using MATLAB 

The matrixes of the 3D array are the components of all the input parameters mentioned below

  • Data (input data)
  • Pilot (pilot signals) 
  • In signal (input baseband signal)

The output OFDM implementation parameter includes waveform which is suited for OFDM modulated baseband signal. MATLAB is a more important tool for much prominent research works in OFDM. So let us now talk more about MATLAB toolboxes that are useful in OFDM implementation

MATLAB Toolboxes for OFDM Implementation 

OFDM implementation in matlab is best suited to carry research work because of inbuilt tools, libraries, and toolboxes available for the purpose. MATLAB provides a simple and efficient platform.   In this regard, let us first look into the communication toolbox below

Communication Toolbox 

  • You can construct and evaluate a physical layer model of any standard-based or custom-designed wireless communications system
    • For this toolbox algorithms like channel coding, MIMO, modulation, and OFDM can be used.

The following aspects of channel estimation in OFDM are supported by this toolbox 

  • Modulation and Channel Coding toolbox helps in defining the networking parts for convolutional, turbo, LDPC, and TPC channel coding; modulation which include OFDM, QAM, and APSK; scrambling, interleaving, and filtration
  • Synchronize and Receiver Architecture are involved in the simulation and design of front-end receiver and synchronization components such as AGC, DC blocking, carrier and timing synchronization, and I/Q imbalance correction
  •  Generation of Wireless Waveforms by Modulating waveforms by generating, impairing, visualizing, and exporting them using OFDM, WLAN 802.11, QAM, and PSK

For advanced details on communication toolboxes and other toolboxes, you can reach out to us at any time. What is the MATLAB LTE system Toolbox 5G library?

MATLAB LTE System Toolbox 5G Library

You may model the following elements of 5G in OFDM with this library

  • OFDM Cyclic Prefix (CP-OFDM)
  • Windowing, WOLA (W-OFDM), and filtering are examples of spectrum shaping techniques (F-OFDM)
  • NR Subcarrier Spacings in OFDM Waveforms and its frame numerologies 

We are here to provide you with code implementation tips and real-time execution procedures and techniques using MATLAB for all OFDM Channel estimation and simulation methods. Let us now talk about wireless HDL toolbox,

Wireless HDL Toolbox 

  • Wireless HDL toolbox provides a MATLAB-based implementation of an OFDM-based wireless transmitter
  • It is optimally designed for generating HDL code
  • This toolbox illustrates the unique design of an OFDM-based transmitter.
  • Using the input port, this transmitting approach indicates payload data acceptance
  • Data modulating method and punctured convolutional code rate are selectable from a list of parameters.
  • These two factors, which are given by the transmitter’s input ports, regulate the successful data transmission rate
  • Data rates of up to 3 Megabytes per second are supported by the transceiver
  • And also, the transmitter receives a reliable signal as input to regulate transmissions

As we have worked with all such toolboxes and library functions in MATLAB we are highly skilled to support you throughout your research. So we are ready with potential solutions to any kinds of research issues that you might face regarding the use of these tools. Let us now talk about the transmitter model

 Transmitter Model 

  • The transmission model uses two factors, modTypeIndex and codeRateIndex
  • These are respectively used to indicate the type of modulation and punctured code transmission rate

Much deeper insight can be obtained by looking into its configurations. In this regard, below is a technical note of different values and their associated modulation type and code rate

  • codeRateIndex
  • The values between 0 and 3, the code rate representations are ½, ⅔, ¾ and ⅚ respectively
  • modTypeIndex 
    • For respective values of 0 to 3, the type of modulation represented are BPSK, QPSK, 16QAM and 64QAM

We provide our customers with all details from basics to advanced aspects of OFDM implementation in matlab programming. You can get complete details on OFDM with references from top research journals, articles, and books. Let us now talk about the OFDM frame structure. 

OFDM Implementation in Matlab Simulink Frame Structure 

Each OFDM module utilizes frames that depict the frequency domain organization of data amongst several subcarriers. The section below outlines the OFDM characteristics included in the model

  • Active subcarriers (72) and subcarrier spacing (15 kilohertz)
  • Length of cyclic prefix (32), left and right guard subcarriers values being 28 and 27 respectively
  • OFDM signal Bandwidth (1.4 Megahertz) Data symbols per frame (32) and sample rate (1.92 Msps)
  • FFT length (128) and pilots per data symbol (12)

For more details on OFDM frame structure and the methods used in constructing different frameworks, you shall talk to our technical experts. We function throughout the night to support our customers. Let us not talk about the model inputs and outputs OFDM frame structure in detail below

Model Inputs

The following is a note on model inputs in OFDM 

  • codeRateIndex – A ufix2 scalar that specifies the code rate of punctured convolutional code is to be implemented to payload data
  • As stated earlier the coding rates 1/2, 2/3, 3/4, and 5/6 are represented by the values 0, 1, 2, and 3
  • modTypeIndex— A ufix2 scalar that specifies the kind of symbol modulation to be delivered to payload data
    • As said before the modulation kinds BPSK, QPSK, 16QAM, and 64QAM are represented by the numbers 0, 1, 2, and 3
  • Valid— A Boolean scalar that represents a valid signal for the incoming data.
  • To enable various configurations, all incoming ports get executed at a sample rate of 30.72 Msps.
  • Data— A Boolean scalar contains the input payload data

In the same way, there are various aspects of outputs that a researcher should be very well aware of.

Model Outputs

The following are the important aspects of model Outputs for OFDM

  • txData— Transmission outputs, measured at 1.92 Msps as a complicated scalar with fixdt(1,16,13) type of data.
  • ready–— A Boolean scalar sampled at 30.72 Msps which always controls the sampling of input data, codeRateIndex values, and modTypeIndex
  • txValid— A Boolean scalar sampled at 1.92 Msps that regulates whether or not txData is valid.

These input and output parameters are very much important in designing OFDM frameworks. You might have handled these models and functions before. For doubts on aspects apart from those mentioned here you can reach out to us through any means. We are very much happy to help you. Let us now talk about the parameters used in the implementation of OFDM

 Research Guidance for Implementing OFDM Simulation in Matlab Simulink

Simulation Parameters for OFDM 

  • Number of guard bands — subcarriers in the right and left guard bands 
  • Insert DC null — This option allows you to insert a DC null
  • Pilot input port — For the selection of a pilot input port
  • Cyclic prefix Length — The length of a cyclic prefix
  • Pilot Subcarrier indices — Subcarrier indices for pilots
  • Window length — represents the length of the raised cosine window 
  • Number of transmit antennas — The number of transmission antennas is represented by this parameter
  • Apply raised cosine windowing between OFDM symbols – Raise the cosine window between OFDM symbols is an option.
  • Number of OFDM symbols — represents the OFDM symbols 

These parameters play an important role in OFDM simulation and implementation. With more details on real-time implementation works and practically executed projects, you will get a complete idea and an advanced understanding of the various methods used for OFDM implementation. In this regard, let us have a look into MATLAB toolboxes used in OFDM 

MATLAB Ideas for OFDM Implementation 

  • Using OFDM to issue null subcarriers
  • The purpose is to use OFDM modulation to assign null subcarriers
  • The procedure followed includes setting up input parameters and generating random data. The data is then modulated using QAM and OFDM
  • Null and Pilot Packaging in OFDM Modulation
    • OFDM-modulation of data input, including null and pilot packing options are presented by this framework
    • With this, you can set up the input configurations, including the null and pilot subcarrier positions
    • It also permits the creation of a random set of data and modulates it using OFDM
  • Two Antennas with OFDM Modulation
    • The option provides for using two transmit antennas, OFDM-modulate a completely packed input
    • As a procedure, you can set up input settings, produce random data, and modulate using OFDM
  • For using OFDM to spatially multiplex a QPSK signal across two antennas.
    • Implementation of OFDM modulation on a QPSK signal spatially multiplexed over two transmit antennas.
    • The procedure consists of the following steps
  • To every antenna, initializing parameter values
  • Create random data
  • QPSK modulates data for each antenna separately
  • Modulate the OFDM signal

So MATLAB is one of the most useful tools for OFDM implementation. We have got a huge experience of handling MATLAB toolboxes and so we are highly equipped to provide you with massive research-related data that you can use for your OFDM project. What are the recent OFDM research topics?

Latest Research Topics in OFDM 

  • Optimized Spectral Efficiency in Interference Mitigation 
  • Improve Physical Layer Security 
  • Frequency Offset and Channel Estimation for OFDM
  • Modulation and Demodulation Classification in OFDM
  • Receiver Design by Iterations for Flip OFDM 
  • Normalization of Power for Burst OFDM signals 

While OFDM seems to be the most extensively utilized scheme in existing systems, it is projected to maintain its dominant position in future devices including 5G. Multiple security needs, including confidentiality, reliability, and scalability, are required for 5G networks. Due to the inclusion of innovative methods and components like massive Multiple-Input Multiple-Output systems (MIMO OFDM Simulation Matlab), the filtration system, etc, 5G systems require extra and more complicated needs than earlier systems As a result, security is now an unavoidable prerequisite for future models to function properly, and it must be handled at many stages of the protocol stack

At present we are rendering research support on all aspects including topic selection, thesis writing, project design, and many more in all the topics mentioned above. Reach out to us and grab the opportunity of working with the world’s top research experts. Let us now see about OFDM security

Security in OFDM 

  • As OFDM is the most extensively utilized scheme in present systems, it is likely to retain its supremacy in future models, like 5G frameworks
  • Various security criteria are required for 5G systems, notably privacy, reliability, and availability.
  • Due to the inclusion of advanced innovations and features such as massive Multiple-Input Multiple-Output systems (MIMO), the filter-bank, etc, 5G has extra and more complicated needs than previous models.
  • As an outcome, security becomes an unavoidable prerequisite for future models to function properly, which has to be handled at several layers of the protocol stack and the overall system

In this aspect, it is high time that we talk in detail about the OFDM security techniques and associated algorithms. It is highly important to note that researchers around the world reach out to us for handling advanced software and tools associated with OFDM implementation. As a result, we gained expertise by also updating us with innovative ideas and Research solutions in OFDM. In this regard let us talk about OFDM security techniques.

Security techniques for OFDM 

The following are the important aspects of any technique used for ensuring security in OFDM

  • Authentication techniques for devices and Data security approaches 
  • Methods of source authorization and integrity of data
  • Key creation and delivery schemes like the following
  • Encryption in the Permutation Phase
  • Noise and quick fading effects that are not real.
  • Power distribution
  • Encryption through Radio jamming
  • Decreased PAPR Disruptions in the channel and hardware
  • Assessment of existing cipher techniques in terms of performance and robustness
  • Anti-jamming PLS methods currently in use
  • Data encryption using channels
  • Encryption of the preamble
  • Enhancement of joint PLS

Physical layer security (PLS) approaches are hampered by channel and equipment defects, which usually occur in communication. This puts the safety of data transmitted in danger. QoS for OFDM is reduced due to poor channel modulation schemes. However, various strategies have lately been developed that take advantage of this vulnerability to achieve extreme confidentiality. To overcome these concerns, the OFDM’s security is enhanced as follows

  • Non-linear converter procedure
  • In this case, the power amplifier’s non-linearity can be employed to increase the safety of data transmitted.
  • In particular, the transmitter is allowed to compensate data in a way that it has huge fluctuations at the opponent’s power amplifier’s input, but smooth stable magnitude at the genuine receiver’s side
  • IQ imbalance and phase noise
    • When building reliable wireless technological systems, both IQ imbalance and phase noise must be factored in because they both have a negative impact on efficiency and reliability.
    • As a result, solely legitimate users will be able to accurately capture transmitted data, whereas illegitimate users cannot.
  • Synchronization issues
    • Users are unable to complete time/frequency synchronization due to synchronization errors.
    • Since the impacts of Carrier Frequency Offset (CFO) and Symbol Time Offset cannot be compensated for, performance suffers significantly
    • The cyclo-stationary property of the cyclic prefix is purposely suppressed in these methods, causing synchronization issues and preventing the unauthorized user from identifying this characteristic.

Apart from these techniques, many other innovative measures have also come into play regarding OFDM security. Get in touch with us to know more about recent research innovations with guidance for OFDM Implementation in Matlab. We are always glad to assist you throughout your research