This paper considers several aspects concerning the downlink channel adaptation for TDD (Time Division Duplexing) based LMDS (Local Multipoint Distribution System) systems. First the requirements with respect to round-trip-time and complexity are considered, then a candidate scheme for the Forward Error Correction (FEC) scheme is described. The results of a simulation study of the performance o...

In this paper, a comprehensive performance evaluative study has been made on a secured MIMO MCCDMA wireless communication system with implementation of Minimum Mean Square Error (MMSE) and ZeroForcing (ZF) Linear channel equalization schemes. The 4G compatible system deploys two channel encoding schemes(1/2-rated Convolutional and CRC ) under BPSK,DPSK QPSK and QAM digital modulations. In the p...

In this paper, we provide an exact closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of phase noise, frequency offset, and amplifier nonlinearities of the soft envelope limiter (SEL). This formula describes explicitly the various parameters with the system performance. After deriving th...

We demonstrate high-speed (90-GBd) modulation of a polymer I/Q modulator achieving single-polarization quadtrature phase shift keyed (QPSK) data rates of 180 Gb/s. Introduction In-phase/quadrature (I/Q) optical modulators are key components for today’s coherent optical transmission systems. Increasing the modulation rate and moving to more complex modulation formats is necessary to achieve high...

Multiple input multiple output (MIMO) system with millimeter wave frequency is one of the most important technologies in fifth generation wireless communication systems. This paper presents performance evaluation for MIMO based on Space time block code (STBC) Wave range. MIMO-STBC an efficient technique to solve problems 5G due increasing density transmitted information and obtain higher data r...