Tandem Filter Bank-DFT Code for Bursty Erasure Correction

DFT encoding over the real (or complex) field has been proposed as a means to reconstruct samples lost in wireless network transmissions. The quantization associated with practical implementations results in reconstruction errors that are particularly large when lost samples occur in bursts (bursty erasures). Here we present a setup that effectively creates disjoint DFT codes along the rows (temporal codevectors) and columns (subband codevectors) of a frame under analysis. An erasure burst along a particular codevector can then be broken up by reconstructing some lost samples along the remaining orientation; these samples can then be used as received samples in reconstructing the original codevector, a technique that we refer to as pivoting. Expressions for the temporal code reconstruction error and for temporal-to-subband pivoting operations are presented.