Filter bank-based multicarrier using offset quadrature amplitude modulation (FMBC/OQAM) systems suffer from inter-symbol-interference (ISI) and cochannel interference (CCI) if the transmission channel is dispersive, or simply if the overall system is not synchronised. This paper considers the solution to an equaliser that can mitigate both ISI and CCI by describing the equivalent transmultiplexed channel including the filter banks as a polyphase matrix of transfer functions, and by using polynomial matrix algebra to equalise this system. We demonstrate that the reduced-rank nature of this channel matrix requires a polynomial matrix pseudoinverse, and demonstrate how the overall FBMC/OQAM system is orthogonalised, thus removing ISI and ICI.

When using filter bank based multicarrier orthogonal quadrature amplitude modulation (FBMC/OQAM) techniques in a multiple-input multiple-output (MIMO) environment, its difficulty of dealing with inter-symbol interference (ISI) and inter-carrier interference (ICI) is further exacerbated by the presence of spatial interference. In this paper, we describe the transfer functions (including all temporal and spatial interference terms) by polynomial matrices. The equalisation of this system can then be performed by a proposed polynomial matrix pseudo-inverse. Some numerical examples for this approach are presented.

This paper is concerned with evaluating the performance of differential space time block coding (DSTBC) over very high frequency (VHF) aeronautical communication channels (i.e. air-to-ground). Differential phase shift key (DPSK) is one of the differential transmission schemes that transmit information without full channel state information (CSI) at the receiver. There are two main problems that degrade the performance of the communication over this channel, multipath fading which is a common problem in any wireless channel and Doppler shifts which result from aircraft speeds. In order to combat such fading and improve the bit error rate (BER) performance of the communication system over this channel, the paper investigated the usage of multiple input multiple output (MIMO) systems with differential transmission scheme. This was done through computer simulations that analyze the performance of DSTBC using two antennas at the transmitter and N antennas at the receiver.

Future television white space (TVWS) transceivers require frequency agility and adherence to spectral masks. For the 320 MHz wide UHF range for TVWS in the UK, this paper discusses two variations of a design for wideband digital up- and down converters at are capable of sampling at radio frequency. The designs consist of a two stage digital conversion is presented, comprising of a polyphase filter that implicitly performs upsampling and decimation, as well as a filter bank-based multicarrier stage capable of resolving the 8MHz channels of the TVWS band. The up- and down-conversion of 40 such channels is shown to not significantly exceed the cost of converting a single channel. The required spectral mask and the reconstruction error of the overall system can be controlled by the filter design. We demonstrate that even the more costly of the two transceiver designs can be implemented on a Virtex-7 FPGA with sufficient word-length to satisfy the spectral masks

This paper is concerned with evaluating the performance of M-ary differential phase shift keying (M-ary DPSK) modulation schemes over (very high frequency) VHF aeronautical channel (air-to-ground communication channel). The paper investigated the analytical bit error rate (BER) performance of binary differential phase shift keying (BDPSK) over aeronautical channel for flight scenarios: En-route, Arriving, Taxiing, and parking. By using the published measurement parameters, the analytical results are verified through modeling and computer simulation. The BER results show that multipath fading and Doppler shifts in the VHF aeronautical channel degrade the performance of M-ary DPSK modulation schemes over the channel. In order to combat fading and improve the BER performance of this channel, the paper proposed computer simulation of the performance of differential space time block coding (DSTBC) using two antennas at the transmitter and one antenna at the receiver.