Software Listing of Author : "Hamid Ramezani"

In this document, the problem of OFDMA multi-user resource allocation based on MMSE channel estimation is considered. Maximization of system capacity, based on available error-free instantaneous estimated channel state information at the transmitter, is the goal. Optimal power distribution between different subchannels is computed analytically, and it is shown that equal power allocation among subcarriers is almost near the optimum capacity. Furthermore, the optimum number of pilots and the amount of power allocated between pilot and data subcarriers is computed analytically. Moreover, it is shown, trough simulation, that numerical results absolutely coincides the analytical computations.

  • Platform: Matlab, Scripts

As the power needed to transmit a certain number of bits in a subcarrier is independent of the numbers of bits allocated to other subcarriers, it turns out that a greedy approach is optimal. A greedy algorithm assigns bits to the subcarriers one bit at a time, and in each assignment, the subcarrier that requires the least additional power is selected. The bit allocation process will be completed when all required data rate is satisfied.

  • Platform: Matlab, Scripts

In this programe a highly scattered enviroment is considered. The Capacity of a MIMO channel with nt transmit antenna and nr recieve antenna is analyzed. The power in parallel channel (after SVD decomposition) is distributed as water-filling algorithm The pdf of the matrix "lanada" ( V in SVD decomposition) elements is depicted too.

  • Platform: Matlab, Scripts

Here, we consider only the distance based localization of a single target. There are N anchor nodes in the system and one mobile node, we use the measured distances and we find the location of the mobile through multilateration.

  • Platform: Matlab, Scripts

The Matlab code investigates the harmful effects of high power amplifier on ofdm signals. It is imagined that the amplifier destroy the amplitude of the transmitted signal due to saturation and has no effect on the signal phase. The model is acceptable for solid state amplifier to some extend.

  • Platform: Matlab, Scripts

The comb pilot aided channel estimation in ofdm modulation is considered. The power of pilot subchannels is under the control. The data experience frequency selective channel then the AWGN noise is added to make the situation worse. The bit error rate is ploted versus SNR.

  • Platform: Matlab, Scripts

The program distributes an amount power among ofdm subchannel to make the capacity of a channel.

  • Platform: Matlab, Scripts
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