STINGRAY aims to develop a novel reconfigurable OFDM system with space-time coding for a broadband wireless access system in order to maximize the system capacity and the system robustness. Therefore, the space-time codes will be varied in such a way that the bit error rate of the system will remain constant and almost independent of the channel. 

STINGRAY has various innovative parts since new reconfigurable transmitter and receiver architectures exploiting the antenna diversity are provided. Therefore higher bit rates are obtained and the bit error rate of the system can be kept constant even when the channel degrades. DST has participated in the STINGRAY project first, by designing a very fast systolic IFFT/FFT architecture for 256 points. The architecture has achieved an operating frequency of 185 Mhz on a Xilinx implementation (Virtex II). During the debugging cycle, the NKUA team performed test fits (place and route) with xc2v2000-5bf957 being the target device, of Virtex2 family. Results showed that the FFT/IFFT block requires 44% Number of Slices, 36% Number of Slices Flip Flops, 8% Number of bonded IOBs and 28% Number of RAMs. Second, DST has designed an "Residual Phase Noise Estimator" Architecture. This architecture uses the SACA algorithm to compensate the phase noise of the channel. The receiver uses the estimation result to correct (de-rotate) the OFDM symbols.