Walsh-Hadamard precoded circular filterbank multicarrier communications

Circular filter bank multicarrier communication (C-FBMC) is an emerging multicarrier communication technique which combines the classical FBMC/OQAM with circular convolution. It has a block based structure and achieves orthogonality among subcarriers. This paper applies Walsh-Hadamard precoding scheme to C-FBMC to exploit the frequency diversity in a multipath channel. The theoretical approximation for the bit error rate (BER) of the resultant scheme, abbreviated WHT-C-FBMC, is derived. Its BER performance is also compared to the performance of precoded GFDM. Results show that the theoretical results match well with simulation results and WHT-C-FBMC is superior than WHT-GFDM.