Design of space time block code ultra-wideband (UWB)‎ system based on discrete wavelets transform

الملخص EN

Outage performances are investigated for space-time block coded multiband orthogonal frequency division multiplexing ultra-wideband systems STBC MB-OFDM UWB using discrete wavelet transform DWT.

As the channel model considers the log-normal shadowing, the resultant signal to noise ratio (SNR) follows a Rayleigh's distribution.

Based on this, we determined Bit error rate BER by simulations.

Also, the design of STBC MB-OFDM UWB systems, with two transmit and one or two receive antennas using DWT and fast Fourier transform FFT, for achieving 1 Gbps data rate.

We study the performance of these systems with different channel models schemes.

The BERs and the operating range of these systems are obtained using frequency domain baseband simulations as well as more realistic full-system simulations, and are compared to those of single antenna systems.

Simulation results show that the STBC MB-OFDM UWB systems provide significant gains for 1 Gbps transmission over single antenna MB-OFDM UWB systems.

We show that the BER performance of STBC MB-OFDM UWB system is the product of the number of transmit and receive antennas, the number of multipath components, and the number of jointly encoded OFDM symbols.

Interestingly, the diversity gain does not severely depend on the fading parameter, and the diversity advantage obtained under Rayleigh's fading with arbitrary parameter is almost the same as that obtained in Rayleigh fading channels.

Finally, simulation results show that the STBC MB-OFDM UWB systems with discrete wavelets transform dwt provide significant gains for 1 Gbps transmission over mb-ofdm uwb systems using conventional method with Fast Fourier transform FFT.