Error detection and correction

application. Codes are used for data compression, cryptography, error-correction and more recently also for network coding. Codes are studied by various scientific disciplines – such as information theory, electrical engineering, mathematics, and computer science – for the purpose of designing efficient and reliable data transmission methods. This typically involves the removal of redundancy and the correction (or detection) of errors in the transmitted data.” (Coding Theory, 2010) There are many

As with the improvement of cameras that produce high quality videos and images, storage needed to store the videos is became a big issue especially for the film makers that have huge video files to store. Thus we need a mechanism that make the videos compact so that they efficiently store on the hard drives and other storage devices. Here comes the compression techniques that makes it possible to remove the redundancy from bit stream of video files so they take less place to be stored. Transmission

BER performance, I applied the following method to calculate the optimal rotation angle (θ_opt) for the interleaving system applied to MQAM/MPSK schemes. The selection of optimal rotation angle is based on finding the expression of average symbol error probability (P_s) corresponding to θ given certain signal-to-noise ratio (SNR). I found out that the optimal rotation angle (θ_opt) approximately around 8.6 degree will maximize the BER performance. CE2.19 I noticed that the simulating process was

air-interface as mentioned previously. Thus, also making effective use of allocated bandwidth. The following three techniques come under this category: FDMA – Frequency División Multiple Access TDMA – Time Division Multiple Access CDMA – Coded Detection Multiple Access For, FDMA, an allocated bandwidth over the channel is divided among the users connected over that channel. In, TDMA, each of the users take turns to transmito r reciveve data over the same frequency. While in CDMA, each user has a

a new way of thinking in the construction of communication algorithms. This method was introduced in a system of error control for data transmission, called turbo code. This family of Forward Error Codes (FEC) consists of two key design innovations: concatenated encoding and iterative decoding. The turbo principle has been extended into new receiver topologies such as turbo detection, turbo equalization, turbo-coded modulation, turbo MIMO, etc. In the case of transmission systems with interference

channels. Error coding is utilized as a part of numerous advanced provisions like workstation memory, attractive and optical information stockpiling media. The investigation of mistake rectifying codes and the cohorted arithmetic is known as coding hypothesis. In information theory, the amount of positions at which the relating images are distinctive between two strings is Hamming distance. Hamming code is a set of error correction codes that might be utilized to recognize and right bit errors that can

channels. Error coding is utilized as a part of numerous advanced provisions like workstation memory, attractive and optical information stockpiling media. The investigation of mistake rectifying codes and the cohorted arithmetic is known as coding hypothesis. In information theory, the amount of positions at which the relating images are distinctive between two strings is Hamming distance. Hamming code is a set of error correction codes that might be utilized to recognize and right bit errors that can

to reliably send data over noisy or otherwise unreliable communication channels. We can use error correction codes to help mitigate the introduction of errors into our data. To do this, we can divide our data into smaller pieces called messages and map these messages to codewords through a process called encoding. This process will provide necessary redundancy to correct a certain number of introduced errors during the decoding process. An (n, k) block code C is an injective map E : Q k 7→ Q n where

Department of Computer Science Assignment 2 CS 2204: COMMUNICATIONS AND NETWORKING   1. What is crosstalk? How is it minimized in case to twisted pair of wire? Crosstalk can be defined as the interference to a signal path from other localized signal paths. When several lines are close together, the current passing along one line may cause current to flow in one or more adjacent lines. This may be the result of capacitance between the two lines or the effect of inductance. This effect is known

4.2 Implementation Details 4.2.1 Data Source Random Bernoulli generator generates binary data on a per frame basis. In data output, 144 samples per frame are used, and data rate is 36 Mbps. Figure 4.2: Data Source 4.2.2 Forward Error Correction Coding A typical problem in OFDM based systems is a high Peak-to-Average Power Ratio (PAPR). The available RF power amplifiers usually have a limited linear dynamic range. This is not a problem for constant amplitude signals, however, in OFDM, due to IFFT