Block FIR decision-feedback equalizers for filterbank precoded transmissions with blind channel estimation capabilities

In block transmission systems, transmitter-induced redundancy using finite- impulse response (FIR) filterbanks can be used to suppress intersymbol inte rference and equalize FIR channels irrespective of channel zeros. At the re ceiver end, linear or decision-feedback (DF) FIR filterbanks can be applied to recover the transmitted data. Closed-form expressions are derived for t he FIR linear or DF filterbank receivers cor;responding to varying amounts of transmission redundancy. Our framework encompasses existing block transm ission schemes and offers low implementation-cost equalization techniques b oth when interblock interference is eliminated and when IBI is present as, e.g., in orthogonal frequency-division multiplexing with insufficient cycli c prefix. By applying blind channel estimation methods, our filterbank tran smitters-receivers (transceivers) dispense with bandwidth consuming trainin g sequences. Extensive simulations illustrate the merits of our designs.