High Temperature Quadrature Amplitude Modulation over Orthogonal Frequency Division Multiplexing

Quadrature Amplitude Modulation All Optical Orthogonal Frequency Division Multiplexing-dense Wavelength Division Multiplexing-optical Wireless Communication System under Different Weather Conditions

This paper proposes an analytical model for evaluating the performance of dense wavelength division multiplexing (DWDM) for all optical orthogonal frequency division multiplexing (AO-OFDM) optical wireless channel. The investigated performance for proposed system is evaluated for the parameters  bit error rate (BER) and Q factor .The constellation diagrams, and bit error rate (BER) of the recei...

Quadrature Amplitude Modulated Codes for Orthogonal Frequency Division Multiplexing Applications

The development of next generation of high-speed mobile communication systems requires cost-effective transmission techniques. Orthogonal Frequency Division Multiplexing (OFDM) is a transmission scheme that has gathered much attention lately for its high performance at comparably low complexity. It has already been adapted in the European radio(DAB)and TV(DVB-T)standards, and IEEE 802.11a. Desp...

An Efficient Hierarchical Modulation based Orthogonal Frequency Division Multiplexing Transmission Scheme for Digital Video Broadcasting

Due to the increase of users the efficient usage of spectrum plays an important role in digital terrestrial television networks. In digital video broadcasting, local and global content are transmitted by single frequency network and multifrequency network respectively. Multifrequency network support transmission of global content and it consumes large spectrum. Similarly local content are well ...

Asymmetric Orthogonal Frequency Division Multiplexing

The system described in this paper is an asymmetric adaptation of orthogonal frequency division multiplexing (OFDM). In a conventional OFDM system, the signal processing hardware is divided equally between the base station and the terminal. In the asymmetric system, most of the complex signal processing hardware is shifted to the base station, making the terminal a simpler and more power-effici...

Orthogonal Frequency Division Multiplexing Modulation and Inter-carrier Interference Cancellation