Research On PC To PC Multipoint Wireless Communication

The term wireless communication virtually covers every communication method that exists now and it is impossible to discuss the researches of this field, because there are more than 100 research institutes and more than 10000 researchers for this particular job and most of those researches are proprietary.The advantages of a RF communication system are many. Start with the simple fact that if it is wireless, you don't have to lay cable all over your facility. Cable is expensive, less flexible than RF coverage and is prone to damage. For new facilities, implementing a wireless infrastructure may be more cost effective than running cable through industrial environments, especially if the space configuration may change to support different storage space allocation or flexible manufacturing stations. Accessibility is a key benefit. If workers are within range of the system and they always should be if a proper site survey is performed they are always in touch with their data. This advantage cannot be overstated. To always have your data literally at your fingertips whenever needed means there is no break in productivity and no empty or "deadhead" trips to a stationary terminal, docking station or dispatch location to receive pick or put away instructions. Critical decisions can be made and action taken immediately at the point of activity. Less wasted time means you can do significantly more, faster, without adding additional employees. Other general advantages of real-time RF communication include a significant improvement in order accuracy (＞99%), the elimination of paperwork, replacement of time-consuming batch processing by rapid real-time data processing, prompt response times and improved service levels. Complementing a real-time data collection system with automated data entry by bar code scanning or another automatic data collection technology improves the accuracy of information and eliminates the need for redundant data entry, which provides another set of time- and cost-saving advantages. Many points in the supply chain can realize important advantages of accurate, real-time data that RF provides.Nowadays the term wireless communication covers a very broad spectrum of applications and it is very difficult to cover all those applications and its working in just one project. Narrowing down to the basic application and its working, this project explain how to start your journey into the wireless world by building up the concept from ground zero to a level where you can actually feel that creating a wireless link between PC to other devices is just piece of cake to you. Creating a RF link between different devices is a nightmare for engineering students and even for some professionals, but after going through this reportⅠassure you that it will be a matter of few hours that you can actually embed a wireless link into a device or a PC.This is achieved by engineering a special communication protocol system for multipoint (half duplex broadcast type) serial and RF communication. This protocol simplifies the entire communication task by making packets of data into frames and attaching headers and trailers to it and then transmitting it. To achieve this job, a simple RF communication link has been setup with protocol scheme implemented in C#.Net Ver2.0. By implementing this scheme in software rather than in hardware (thru firmware) the whole process of framing and packeting is made transparent to the audience as well as engineers. Later on when the framing system is fully optimized for our requirements it can be transferred into controllers and will be called intelligent transceiver which will process all the overheads of the communication and framing, and communication overheads will simply become transparent to the end user or application. The beauty of the project is that, all this multipoint communication just utilizes single frequency of 433 MHz i.e. maximum bandwidth utilization, and can be further expanded to handle multi channel or Spread Spectrum technique (CDMA). At the same time, the Research on PC to PC Multipoint Wireless Communication proposed by this paper can be used for a reference to the related works. Off the screen there are lot of considerations and studies required to complete this project which basically starts from the basics of electronics, designing simple circuits, integrating different modules together while taking care of the performance issues. The most important and interesting area of this project is RF communication which itself is a separate and huge topic.Taking in account the complexity of this project, "design" is arranged in a manner that even a beginner can understand and implement it. In order to do that the project is divided into 3 main design phases or milestones, each phase has its own importance, only by following the exact sequence, a beginner can actually implement the system.Phase 1 is the initial phase which covers the very basics of serial communication implementationPhase 2 is an enhancement of phase 1 in which a property of RF communication is reflected and that is single medium for transmission and reception of data, hence this phase deals with engineering a half duplex multi node/point communication software which is implemented in a RS485 bus environmentPhase 3 is the final phase where the RS485 bus environment is replaced by the RF hardware and few upgrades are implemented in the software regarding the packets and error detection scheme.In first 2 phases of the project a more advance form of serial communication link is engineered which is capable of communicating in multi-node Bus network environment at a distance up to 1000 meters and at a speed up to 9.6Kbps. This is a half duplex multipoint communication method which requires special protocol scheme to distinguish data packets for different nodes. All together a maximum of 32 nodes can be added to the bus network and further can be added by inserting repeaters and switches in between the line. This phase of the project teaches us how to communicate in multi point environment in which data is transmitted and received in a form of packets and each node has to process all the packet in order to find the data that has been transmitted to it.The 3rd phase of the project i.e. wireless serial communication between 2 PCs. Once an RF link has been established, the challenge becomes how to effectively transfer data across it. While a properly designed RF link provides reliable data transfer under most conditions, there are still distinct differences from a wired link that must be addressed Since the RF modules used in our project do not incorporate internal encoding/decoding, the user has tremendous flexibility in how data is handled. If transfer of simple control or status signals required, such as button presses or switch closures, and your product does not have a microprocessor on board or you wish to avoid protocol development, consider using an encoder and decoder IC set. When doing projects that has RF link, sending and receiving signal is one task and getting the data out of that signal is another, Issues such as interference and noise must be understood and allowed for in the design process. In such circumstances the protocol comes into play. In this phase a special protocol has been designed.As it is already cleared that the most important part of the project is wireless data communication so the engineer or designer must have the comprehensive information of RF systems and applications, microwave and wireless devices and signals, so advancing your fundamental knowledge is important for mastering many of today's test and measurement applications. Basics of RF, communications provides the essential information about analog and digital modulation, I/Q data, RF and microwave specifications, performing spectral measurements as well as over-arching glossary of RF communication and technique. Every designer and engineer working on RF system must have complete knowledge of the following undamentals;1. Introduction to RF & Wireless Communications Systems2. RF and Microwave Spectral Analysis3. Analog Modulation4. Digital Modulation5. Communications Systems 6. Modulation Measurements7. Communication Standards8. Understanding RF & Microwave Specifications9. RF & Communications Terminology and Glossary10. RF & Communications ResourcesA brief but complete basic introduction of Radio frequency communication. Covering the very basics and fundamental factors necessary for the reliable RF communication link are discussed in Chapter 2, to clear the concept of few types of RF communication that is possible and its pros, cons and limitation, and how and where one should decide for the right kind off communication for its application. More over the key factors and components of RF communication techniques is also discussed in chapter 3.