Power Line Carrier Communication (PLC), is a method by making use of the power line network as a transmission medium, which can realize data transfer and information exchange. Since the power line network was originally designed not for communication, in which high-speed data network of reliable, secure communication is very difficult.Orthogonal frequency division multiplexing (OFDM)
(Read More…)
Power Line Carrier Communication (PLC), is a method by making use of the power line network as a transmission medium, which can realize data transfer and information exchange. Since the power line network was originally designed not for communication, in which high-speed data network of reliable, secure communication is very difficult.Orthogonal frequency division multiplexing (OFDM)
(Read More…)
Orthogonal Frequency Division Multiplexing technology is robust to the frequency selective fading in the broadband wireless multipath channel. Multiple-Input Multiple-Output technology can increase the channel capacity of wireless in flat channels. While Hybrid Automatic Repeat reQuest technique can guarantee data reliability. The systems which combine the OFDM technique or MIMO technique and HARQ protocol can
(Read More…)
Orthogonal frequency division multiplexing (OFDM), which is recognized as the future of wireless communication solutions, has many merits such as robustness against multipath fading and inter-symbol interference (ISI), high spectrum efficiency, efficient implementation using fast Fourier transform (FFT) and easily adapt to severe channel conditions without complex time-domain equalization. However, OFDM system has some drawbacks.
(Read More…)
With the rapid development of wireless mobile communication, people’s requirements of information transfer are getting higher and higher. With the applications of the third generation mobile communication technology, the global mobility information age is to coming soon. However, the limited spectral resources become a bottleneck restricting the development of mobile communications. The studies of how
(Read More…)
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission technique, which can achieve the high speed serial data into parallel transmission by frequency division multiplexing. Because of its high bandwidth efficiency and good anti-multipath fading, OFDM technology has become the key technology of the fourth generation mobile communication system. However, OFDM technology has some drawbacks,
(Read More…)
In recent years, with the rapid development of communication technology, the fixed spectrum allocation resulted in a shortage of spectrum resources. A large number of licensed wireless spectrum to be idle, and can not be effectively used. Cognitive radio (CR), with its ability to improve the spectrum utilization by allowing secondary users (SUs) opportunity to
(Read More…)
High rate space-time block codes (STBC) can achieve sufficient diversity gains and high ratedata transmission over multiple-input multiple-output (MIMO) flat fading channels. High ratespace-frequency block codes (SFBC) are designed by combining the high rate STBC withorthogonal frequency division multiplexing (OFDM) over MIMO frequency selective fadingchannels. This thesis investigates the performance of high rate STBC or
(Read More…)
Accurate channel state information is essential to reliable information recovery. Channel estimation technique as one of the key issues in broadband wireless communications has been a hot topic for a long time. The traditional channel estimation methods based on Nyquist sample theory usually have heavy pilot overhead, low estimation accuracy and poor performance. Wireless communications
(Read More…)
In wireless communications, high data transfer rate and high spectrum utilization have always been the pursuit of the goal of the system. Orthogonal frequency division multiplexing (OFDM), as a multi-carrier transmission solution, has been widely utilized in high speed wireless data transmission systems, with high spectral efficiency and resistance to multipath fading. Multiple input multiple
(Read More…)
