Comparative analysis of energy parameters and OFDM-signal reliability receiving with different OFDM sub-carriers number
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Abstract
The effectiveness of the optimal gain for OFDM-signals is proved based on the simulation results. It’s possible to achieve an independence of the energy characteristics and information reliability of group signal generated by technology OFDM from the number of OFDM subcarriers. The paper shows how the value of the optimal gain depends on the OFDM subcarriers number. The analytical expression for determining the optimum gain is realized on the basis of an integral equation, which defines the form of the density distribution of the amplitudes of the amplified signal, and reliability requirements for signal processing, and the value is the desired one. Determination results of are the product of statistical modeling. Knowledge of the value gives you the possibility to calculate the corresponding value of the energy parameter for communication channel (signal to noise ratio) that is the basis for the subsequent analytical calculation symbol and bit error values for each value for signal to noise ratio. The proposed optimal analytical condition is realized on the basis of the solution of an integral equation in which the form of the density distribution is given by a parameter of the distribution for given values of and . The value is the desired one. Determination result for is the product of statistical modeling. If the value is known, then we have a possibility to calculate the corresponding channel parameter value , which is the basis for the subsequent analytical calculation error values and bit error for each channel parameter value value. Justified effect of the described method for forming OFDM-signal allows use this technology as a tool for multiple access communication systems such as promising LTE and other similar technologies. In addition, this property characterizes OFDM technology as potentially effective in a multipath channel, since a change in the number of subcarriers without sacrificing energy received beam allows you to control the duration of a single character, depending on the actual conditions of rays delay, reducing the impact on the quality factor of multipath reception. Reliability losses when using OFDM technology with respect to single-frequency transmission can be compensated for by the selection of an appropriate signal-code structure that containing anti-noise code with the required parameters to achieve required reliability.
Reference 5, figures 11, table 1.
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References
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