The Performance Of Space Time Block Codes ( Stbc )

Right now the future of MIMO isn’t secure. Because devices won’t be interoperable, the cost to change over will be prohibitive. The standards based Wi-Fi gear like routers would benefit from MIMO technology. This would include the Belkin, Linksys and Netgear routers.

Wireless is the term used to describe any computer network where there is no physical wired connection between sender and receiver, but rather the network is connected by radio waves and or microwaves to maintain communications (Boyds, 2016). Wireless and mobile technologies continue to have a major impact on the global business environment and can be roughly categorized into mobile client devices for interactivity and communications infrastructure. Wireless technology is technology that uses radio waves to transmit and receive data, such as cell phones. It is used more than ever today for data transmission. Mobile

R G Gallager [1] in his paper, the overview of low density parity check codes are presented. The parity check matrix specifies these codes, which consists of few entries of non-zero elements. The number of non-zero elements in row should be greater than the number of non-zero elements in column. The typical minimum distance of these codes are directly proportional to block length for a fixed rate. A simple but non optimum decoding scheme operating directly from the channel is described. As block length increases, complexity of equipment and data

Communication systems consist of transmitter, channel, and receiver. The latter can be affected by a noise source, such as the Additive White Gaussian noise (AWGN) which, in turn, can cause a change in the data transmission. As a result of data change or corruption, the idea of channel coding was introduced as a reliable solution to overcome this dilemma. Nowadays, we use some techniques as Forward error correction (FEC) to reduce the errors that might appear during the information transmission over the channel. In this technique, the system adds redundant (extra) bits to identify if a specific bit is corrupted or not and correct it. FEC Channel codes may be classified into two main categories: the Convolutional Code and the Block Code. On

Hybrid Channel Assignment schemes are the combination of both Static Channel Assignment and Dynamic Channel Assignment techniques.

A wireless network is any type of computer network that uses wireless data connections for connecting network nodes .Wireless networking is a method by which homes, telecommunications networks and enterprise (business).Installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model  network structure.

For coding in OFDM-CDMA systems using spreading sequences for separation of users is not good, because the spreading operation results in expansion of band- width with no coding gain. In [23] theoretical analysis has been made which shows that the capacity of multiple access channel can be reached if the entire bandwidth expansion is due to the use of FEC

Modern age is the age of technology and in this era data communication has become pervasive in every field of life. It has changed the way we live. Advancements in technology made the communication more efficient, by carrying more and faster signals. The transmission media plays an important role in efficient communication and the technologies used for transmission advanced from wired to wireless.

Cooperative diversity for a simple three-terminal relay channel was first introduced in [12]. Later, in [1], several improvements were made in capacity bounds and cooperative schemes, such as decode-and-forward, were introduced. Modifications to amplify-and-forward scheme were proposed in [13-16]. Based on these, more relaying schemes were introduced in [17-24]. The performance and other characteristics of the aforementioned schemes in several environments were studied in [17-27]. Extensions to a multi-terminal, multihop network were made in [13-17], where a clustered model and ad hoc network architecture were studied and useful results for transmit and receive diversity gains and relaying strategies were obtained.

The paper presents the design of channel estimation and blocking probability for multi-hop wireless communication network (MH-WCN). This work proposed a bidirectional network coding 4−hop transmission strategy and followed by 2N−hop WCNs. The proposed method follows two steps. Firstly, assign composite channel coefficients at desired nodes and then derived the MSE performance expression for the proposed LMMSE estimation scheme, and an optimal training scheme has been designed to minimize MSE. Secondly, Fault-tolerant wavelength assignment algorithm. This method checks for the establishment of fault-free path, when path established, assign a particular wavelength to the established path. The experimental results shows the LMMSE, blocking probability and ML estimators have demonstrated effectiveness to improve the estimation accuracy in 4−hop WCNs.

There are total of 27 channels defined in the PHY layer. These channels are allocated into different frequency bands with varying data rates as showed in Table 1. At MAC layer, it specifies when the devices may access the channel for communication. The basic tasks provided by the MAC layer are beacon generation and synchronization, supporting PAN association and disassociation, managing channel access via Carriers Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism, and etc.

This case study covers the coding theory, its components and its practical applications. Coding theory, sometimes called logarithmic coding hypothesis, manages the configuration of lapse remedying codes for the dependable transmission of data crosswise over uproarious channels.

In wireless communication system MIMO is used to provide better performance as compared with others conventional systems. The multiple data stream is provided in

The characteristics of the channel satellite and mobile communications arm is an important and fast-growing wireless communications and play an important role in the transfer of information through the media of spread from the transmitter to the receiver with the minimum error rate.

The main objective of this project was to successfully implement transceiver that would help in developing 802.11 n modem. The architecture required the realization of 802.16 (Wi-max) and LTE transceivers. It intended to study various alternatives for implementation of the OFDM which resulted in reduced chip size. It included developing a complete system of indigenously developed 802.11n modem which then offered maximum throughput, robust and highly scalable WLAN connections/networks.