ABSTRACT:.In this paper channel estimation for orthogonal frequency division multiplexing (OFDM) is presented. This channel estimation employs two training symbol in combination with polynomial fitting thus to get accurate estimation result. Channel estimation is mainly performed by sending pilot from the transmitter and measuring the pilot at the receiver side. A sufficient amount of pilot nee...

ABSTRACT A mathematical model of a synchronization block of a DS-CDMA system is developed and then investigated using a simulation. For this synchronization a pilot sequence has been used that can be a pseudorandom sequence or a chaotic sequence of a limited length. The theoretical model is tested by simulation. It was shown that the system can be synchronized using a pilot sequence represented...

This article puts forward an examination of using OFDMA method like WiMax for future cellular systems. The main goal of investigation and simulation is Doppler Effect influence on orthogonality disturbance in critical but real situations. The simulation results, allow coming to conclusion that Doppler Effect influence on pilot signals leads to BER increasing. The paper proposes Doppler Effect l...

Many extreme scale scientific applications have workloads comprised of a large number of individual high-performance tasks. The Pilot abstraction decouples workload specification, resource management, and task execution via job placeholders and late-binding. As such, suitable implementations of the Pilot abstraction can support the collective execution of large number of tasks on supercomputers...

To reduce pilot contamination, a downlink precoding algorithm was put forward for Large-scale MIMO system. It set the Least Square (LS) criterion to the objective function, and then solved the precoding matrices with the Lagrange multiplier method. In the solving, it utilized not only the estimated channel information but also the pilot contamination information, which was acquired from some bl...

The effectiveness of an airborne collision avoidance system (CAS) is influenced by the manner in which pilots respond to the system’s advisories. Current pilot response models used in CAS modeling and simulation are agnostic to parameters affecting pilot response in individual encounters and therefore treat all encounters equally. Simulations using these models can potentially underestimate col...

This paper describes a spread-spectrum downlink RAKE receiver that computes a data detection in the frequency domain. We assume a pilot signal is transmitted with data signals for channel sounding. The pilot signal does not degrade the receiver bit error rate (BER) performance because the receiver estimates the pilot signal and subtracts the estimated pilot signal from the received signal befor...