Cyclic block filtered multitone modulation

Abstract

A filter bank modulation transceiver is presented. The idea is to obtain good sub-channel frequency confinement as it is done by the family of exponentially modulated filter banks that is typically referred to as filtered multitone (FMT) modulation. However, differently from conventional FMT, the linear convolutions are replaced with circular convolutions. Since transmission occurs in blocks, the scheme is referred to as cyclic block FMT (CB-FMT). This paper focuses on the principles, design, and implementation of CB-FMT. In particular, it is shown that an efficient realization of both the transmitter and the receiver is possible in the frequency domain (FD), and it is based on the concatenation of an inner discrete Fourier transform (DFT) and a bank of outer DFTs. Such an implementation suggests a simple sub-channel FD equalizer. The overall required implementation complexity is lower than in FMT. Furthermore, the orthogonal filter bank design is simplified. The sub-channel frequency confinement in CB-FMT yields compact power spectrum and lower peak-to-average power ratio than in OFDM. Furthermore, the FD equalization allows the exploitation of the transmission medium time and frequency diversity; thus, it potentially yields lower symbol error rate and higher achievable rate in time-variant frequency-selective fading.

Adaptive zero padded CB-FMT for LTE uplink transmission in the high mobility scenario

“…For high speeds (Doppler frequency greater than 200 Hz), CB-FMT is superior due to the higher robustness offered by the well frequency confined sub-channels. CB-FMT offers also better PAPR characteristics than OFDM [5].…”

“…Assuming to deploy a simple 1-tap equalizer also for this situation, the orthogonality is not restored and some interference may remain. More details can be founded in [5], [8].…”

“…It is referred to as Cyclic Block Filtered Multitone Modulation (CB-FMT) [5]. This scheme is based on the idea of using a cylic filter bank (CFB) [6].…”

MIMO Signal Processing in Offset-QAM Based Filter Bank Multicarrier Systems

“…The latest signal processing developments that enable the combination of MIMO and FBMC/OQAM are the subject of this overview paper. Many other multicarrier modulation schemes are currently under investigation: universal filtered-multicarrier (UFMC) [28], [29], generalized frequency division multiplexing (GFDM) [30]- [33], filtered multitone (FMT) [34], [35] and cyclic block filtered multitone (CB-FMT) modulation [36]. UFMC, GFDM and CB-FMT also possess the key ingredients to become the new wide band access scheme.…”

Power Line Communications: Understanding the Channel for Physical Layer Evolution Based on Filter Bank Modulation

“…It comprises: a DFT of M = LN points equal to the prototype pulse length, a sub-channel equalizer, matching the output signals with the filter coefficients H(i) = G * (i) where G(i) denotes the DFT of the prototype pulse, a periodic repetition, and a final IDFT of L points. The sub-channel equalizer can be designed according to the MMSE criterion [42]. Now, in Fig.…”