QR-DECOMPOSITION DECISION FEEDBACK EQUALIZATION AND FINITE-PRECISION RESULTS

The QRD LS algorithm is generally recognised for its superior numerica l properties under finite-precision implementation. Furthermore, its s ystolic architecture is well suited for VLSI implementation. In DFE ap plications the inherent and implementation nonlinearities make it impo ssible to analyse precisely all effects of finite-precision arithmetic . The paper presents finite precision results of a QRD LS DFE using th e TMS320C25 16-bit precision DSP processors as a simulation platform. Using the bit error rate as a performance measure, results are present ed for 2-PSK, 4-PSK and Pi/4-DQPSK modulation formats. Also presented are the numerical accuracy and convergence sensitivity for the filter weights. These results may serve as a basis for practical implementati on of QRD LS DFEs.