orthogonal frequency division multiplexing (57 résultats)

Etat : New.

Etat : As New. Like New condition. A near perfect copy that may have very minor cosmetic defects.

Taschenbuch. Etat : Neu. Druck auf Anfrage Neuware - Printed after ordering - Thesis (M.A.) from the year 2019 in the subject Electrotechnology, grade: 9, , language: English, abstract: The Orthogonal Frequency Division Multiplexing (OFDM) is an important aspect of multicarrier digital data transmission system where a single data stream is transmitted into a several number of lower rates subcarrier signals. In this thesis, there are five different types of the techniques introduced to strengthen the communication quality and capacity. This kind of new standard of transmission of data is the first one to perform with OFDM in data packet based communication system. In wireless communication network, the abstraction of parallel transmission of data symbols is implemented to attain high throughput and effective transmission quality. The OFDM is a method to deal with parallel transmission.

Etat : Good. Auflage: 2006. Ehemaliges Bibliotheksexemplar. Mit Bibliotheksstempel und Aufkleber am Buchrücken. Als übereignet gekennzeichnet.

Hardcover. Etat : New.

paperback. Etat : New. Language:Chinese.Paperback. Publisher: Defense Industry Press. This book is more comprehensive introduction to orthogonal frequency division multiplexing the basic principles.

Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - OFDM is a computationally efficient scheme to send high bit rate data through multipath wireless channels. The combination of OFDM with multiple transmit and/or receive antennas can not only exploit space diversity, but also the inherent multipath diversity in OFDM. Multiple antennas with considerable separation are known to provide diversity in wireless systems to overcome fading. Spatial correlation is introduced when antennas are not well separated, and it often leads to performance degradation in flat fading environment. However, in frequency selective environment with OFDM, there is rich multipath diversity which helps in overcoming this performance degradation. This is due to transformation of a highly spatially correlated channel impulse response to less spatial correlated channel frequency response inherently by an OFDM system in the presence of rich multipath diversity. This is illustrated for a simple receive diversity OFDM system and the concept of space sampling at the receiver where antennas are placed relatively close to each other is introduced. The minimum separation required between the antennas is also analytically derived under such circumstances.

Etat : New. In.

Kartoniert / Broschiert. Etat : New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Sharma DilipHe did his Ph.D.(EC,2012)& ME(EC,2002)from RGPV, AMIE(EC,1997). Hehas presented & published eleven research papers. He is also a life member of IE, IETE & ISTE. I secured a third Rank in MERRUT LIST of MP-PSC. Now,I am wo.

Buch. Etat : Neu. Druck auf Anfrage Neuware - Printed after ordering - This book explains the principles and various applications of Optical Wireless Communication Orthogonal Frequency Division Multiplexing (OWC-OFDM) and validates the relevant theories through numerical analysis and communication experiments. The book consists of 10 chapters, first providing a systematic and in-depth analysis of the research progress of optical wireless communication and clarifying the importance and advantages of optical wireless OFDM transmission. Then the source coding is discussed, the optical OFDM system is clarified, and the characteristics of optical wireless OFDM are explained by numerical simulation. Theoretical analysis and numerical simulation of peak ratio, time synchronization, channel estimation, and channel allocation of wireless OFDM are carried out. Numerical simulation and communication experiments in the book verify the performance of optical wireless OFDM systems and the feasibility of related algorithms.

Etat : New. pp. 340.

paperback. Etat : New. Language:Chinese.The principle and application of wireless optical orthogonal frequency division multiplexing.

Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - With rapid growth of digital communication in recent years, the need for high speed data transmission is increased. Moreover, future wireless systems are expected to support a wide range of services which includes video, data and voice. OFDM is a promising candidate for achieving high data rates in mobile environment, due to its resistance to ISI, which is a common problem found in high speed data communication. In OFDM, modulation may be differential or coherent. When using differential modulation there is no need for a channel estimate but its performance is inferior to the coherent system. Coherent modulation requires the channel estimation which gives better performance but with relatively more complex receiver structure. Training Symbol Assisted Modulation is used to achieve reliable channel estimates by transmitting Training along with data symbols. In this thesis, Shazib Naveed has analyzed different channel estimation patterns in terms of BER and propose a new scheme for transmitting Training symbols in wireless OFDM systems. Author has also proposed an adaptive scheme of channel estimation in wireless OFDM systems, which track the multi-path fading channel.