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This can result in the carriers being lost in the noise.For the modulation schemes investigated (BPSK, QPSK and 16 QAM), clipping of the OFDM signal was found to have little effect on the performance of the system, allowing the peak power of the signal to be clipped by up to 6 - 9d B before the symbol error rate became significant.
Simulation of Third Generation CDMA Systems Fakhrul Alam ABSTRACT The goal for the next generation of mobile communications system is to seamlessly integrate a wide variety of communication services such as high speed data, video and multimedia traffic as well as voice signals.
The technology needed to tackle the challenges to make these services available is popularly known as the Third Generation (3G) Cellular Systems.
This thesis investigates the effectiveness of Orthogonal Frequency Division Multiplexing (OFDM) as a modulation technique for wireless radio applications.
The main aim was to assess the suitability of OFDM as a modulation technique for a fixed wireless phone system for rural areas of Australia.
The performance of OFDM was assessed by using computer simulations performed using Matlab, and practical measurements.
These measurements were performed by recording a low bandwidth (audio) OFDM signal, generated using Matlab, on to a tape player.
It was found that OFDM performs extremely well compared with CDMA, providing a very high tolerance to multipath delay spread, peak power clipping, and channel noise.
In addition to this it provides a high spectral efficiency.
This low cell capacity of CDMA was attributed to the use of non-orthogonal codes used in the reverse transmission link, leading to a high level of inter-user interference.
The only main weak point that was found with using OFDM, was that it is very sensitive to frequency, and phase errors between the transmitter and receiver.