Non-maximally decimated filter bank-based single-carrier receiver: a pathway to next-generation wideband communication

Abstract

We present the design of a wideband digital modem based on non-maximally decimated filter bank (NMDFB) with perfect reconstruction (PR) property. The PR-NMDFB contains an analysis filter bank (AFB) and a synthesis filter bank (SFB) whose efficient polyphase forms are named as polyphase analysis channelizer (PAC) and polyphase synthesis channelizer (PSC). The waveform being processed is the legacy square root Nyquist-shaped quadrature amplitude modulation (QAM). In contrast to orthogonal frequency division multiplexing (OFDM) systems, the shaped QAM transmission has much superior performance properties in throughput, peak-to-average power ratio (PAPR), and synchronization. We will show the PR-NMDFB is capable of efficiently performing several key tasks of a digital receiver with dramatic workload reduction. This includes digital filtering, carrier recovery, and symbol timing recovery. Moreover, the nature of NMDFB allows the signal processing to operate a significantly reduced sample rate, which is a desired characteristic for replacing current FIR implementation in wideband systems.

Filter bank‐based multiple access in next‐generation satellite uplinks: A DVB‐RCS2‐based experimental study

“…A SC‐FBMA approach would thus be more desirable as it would combine the low PAPR features of SCM with the advantageous multi‐user behavior of FBMA. In fact, the potential of a SC‐FBMC wideband channelizer for significant complexity reduction in synchronization and equalization has been demonstrated in previous studies . Concentrating on FBMC/OQAM as in the present study also benefits from the fact that the offset introduced between the in‐phase and quadrature components of each symbol distributes the power more homogeneously within each symbol period, resulting in reduced amplitude fluctuations and hence allowing high amplification efficiency …”

A Parallel Solution of Timing Synchronization in High-Speed Remote Sensing Data Transmission

“…The research of parallel demodulation technology based on efficient channelization architecture is still in the theoretical stage. In [13], the authors propose a general scheme of digital demodulation based on polyphase DFT filter bank architecture, which can realize all kinds of filter functions in subbands in parallel, thus greatly reducing the computational complexity.…”

“…Although the proposed method realizes parallel speed reduction, it is limited to the condition that the symbol oversampling rate is 4. In [13], the authors propose a parallel timing synchronization method using polyphase filter bank technology. The error correction module of this algorithm is based on a technology of simulating the filter by channelized subband factor multiplication, which can realize the function of a fractional delay filter in subbands in parallel, but the performance of this correction method is proportional to the number of channels, so it is difficult to guarantee the accuracy.…”