Multirate Digital Signal Processing
Multirate Digital Signal Processing
| Hi-index | 0.00 |
A signal whose bandwidth exceeds that of available receivers can be reconstructed from the outputs of spectrally overlapped receivers. Adaptive filters were used to compensate for varying amounts of overlap, relative delay between receiver outputs, and a small amount of frequency shift. The preferred architecture contains adaptive multiple transversal filters, each of which incorporates an adaptive lattice filter to pre-whiten the data, thereby enabling faster convergence. Testing was conducted in the cases that the modulations were QPSK and 16-QAM and when two overlapping receivers were employed. Results indicate that, for a wide range of overlaps and even when the relative delay between receiver outputs is several symbols, the equalizer structure will converge in roughly the same time as a conventional equalizer applied to an unfiltered signal.