Essay On Wireless Communication

Wireless communication has encouraged the practice of optimizing performance in wireless networks to achieve higher data rates and network coverage for the end user. Such strategies and methods will be examined to verify their validity and to introduce future solutions to the limitations of wireless communication systems. Wireless communication performance is affected by channel fading, path loss, and interference. There are several techniques that can be used to avoid signal degradation. At short distances, a transmitter and receiver pair is capable of achieving a quality connection. However, relay networks have become a popular strategy for transmitters and receivers that have been separated by large distances or large obstructions in the path. Relays are used to retransmit the signal with or without encoding it again. Cooperative communication extends coverage and reduces transmission power by utilizing spatial diversity. Distributed Coding is a cooperative technique that allows multiple antennas to work together to transmit information. The specifications for these different networks can be a difficult task. There are several relay configurations and trade-offs. The present design process for relay networks is constrained to the drawbacks of the wireless channel. Strategies using MIMO (multiple input-multiple output) overcome many of the inherent problems with wireless transmission and have become widely popular. Research will expound on the advantages of relay systems, MIMO, and other selected strategies that optimize performance in a wireless network.

Wireless communication has revolutionized our society. It provides access to communication that is impossible to implement with the use of wires. It permits helpf...

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...nd relays can cooperate to transmit to the receiver. The advantage being that the best approximation of the signal will be selected by the receiver. More information can be transmitted if the relays receive and transmit on different channels or duplex. Other relay schemes seek to improve network coverage by sending a message through multiple nodes. The design process goes even further by selecting different modes of operation at relays. Because the signal-to-noise ratio is still the current figure of merit for most wireless communication systems, AAF and DAF protocols are assigned to nodes to maintain a quality signal. The variety of functionalities for a decode-and-forward relay far exceed that of the AAF relay generally because DAF operates at a higher level of signal processing. Lastly, the use of multiple antennas has grown rapidly over the past decade.