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Filter bank-based multicarrier (FBMC) systems have been considered as a prevalent candidate for replacing the long established cyclic prefix (CP)-based orthogonal frequency division multiplexing (CP-OFDM) in the physical layer of next generation communications systems. In particular, offset quadrature amplitude modulation (OQAM)-based FBMC has received increasing attention due to, among other features,...
At the current state in multiuser detection, MMSE detector is very popular because it exhibits a good balance between performance and complexity. Therefore, we investigate the capacity-aware version of the MMSE scheme, linear detection method. In this paper, an novel MMSE MIMO detector is proposed with respect to MMSE MIMO channel estimation. We will show how a two-step MMSE MIMO estimator can be...
New waveform candidates are being investigated for the fifth generation wireless systems. Among the promising candidates, generalized frequency division multiplexing (GFDM) offers the flexibility to address a wide range of requirements (e.g. low latency, coarse synchronization, etc.). Due to the non- orthogonality of GFDM, the transmit signal subjects to inter-symbol and inter-carrier interference...
Interference cancellation (IC) has been proposed to improve bandwidth utilization for the majority of modern wireless networks. We claim that the conventional model for IC residual error, which is that the residual error power is simply a fraction of the power of the packet being cancelled, is overly simplified. In this paper, we evaluate the practical residual error of IC with spread MSK modulation...
We present a per-channel framework for extending monochrome barcodes to color for display applications, offering increased data rates and capacity. Data is independently encoded into barcodes, incorporated within a color image as the red (R), green (G), and blue (B) channels and decoded from the corresponding R, G, and B channels in the image of the displayed barcode captured with a smartphone. Using...
This paper presents a cooperative multiple-input multiple-output (MIMO) scheme for a wireless sensor network consisting of inexpensive nodes, organised in clusters and transmitting data towards sinks. The transmission is affected by hardware imperfections, imperfect synchronisation, data correlation among nodes of the same cluster, channel estimation errors and interference among nodes of different...
In this paper, an novel MMSE MIMO detector is proposed with respect to MMSE MIMO channel estimation. We will show how a two-step MMSE MIMO estimator can be used to facilitate packet detection as well as to provide superior bit error rate performance. This proposed detector takes channel estimation errors into account by the statistical characteristics of MMSE MIMO channel estimation. When compared...
In this paper, we investigate the packet decoding performance degradation due to the joint effects of synchronization and channel estimation errors in orthogonal frequency division multiplexing (OFDM)-based time-division cooperating transmission (TDCT) for the purpose of range extension. The signal to interference and noise ratio (SINR) of maximal ratio combining (MRC) with OFDM TDCT is analyzed in...
In in-band full-duplex employing conventional frame structure, pilot contamination is inevitable due to asyn-chronism between the nodes. Asynchronism can occur for several reasons such as propagation delay and synchronization error. Pilot contamination increases channel estimation error for both the desired and self-interference channels. We propose a new frame structure that avoids interference during...
This paper investigates the applicability of generalized frequency division multiplexing (GFDM) for an uplink scenario where several users are not perfectly synchronized, as it appears in wireless sensor networks (WSN). We compare the performance in terms of inter-user interference (IUI) caused by time and frequency misalignments between users, where the physical layer is realized with GFDM and OFDM...
Automatic Identification System (AIS) reception at flying platforms (satellites or airliners) has attracted an increasing level of attention over the last years. AIS allows vessels to communicate with each other and was originally designed as a vessel collision avoidance mechanism. Although AIS was not designed taking into account a satellite component, it is possible to receive AIS packets using...
Pilot contamination has become a major capacity bottleneck in massive MIMO systems. To mitigate pilot contamination, a novel cell sectorization-based pilot assignment (CS-PA) scheme is proposed in this paper. By separating the users that transmit the same pilot in physical space, the pilot transmitted by the user in each sector is orthogonal with pilots transmitted by the users in adjacent sectors...
This paper deals with the reduction of both self interference (SI) due to multipath, and multiuser interference (MUI) due to multiple access for synchronous DS-CDMA communications over frequency-selective fading channels. We are concerned with the down-link where the base station transmits all the users information synchronously and any mobile receiver must perform a reliable demodulation. In this...
In this paper, we focus on a new small cell discovery signal which improves the detection probability in ultra-dense small cell scenario. Due to the severe inter-cell interference, the detection performance of primary synchronization signal (PSS) and secondary synchronization signal (SSS) is deteriorated in future ultra-dense small cell scenario in the 3rd Generation Partnership Project (3GPP) long...
This paper proposes a novel synchronization algorithm for multiuser digital impulse radio (IR) ultra-wideband (UWB) system. The proposed algorithm is based on pseudo-noise (PN) training sequence, and different users employ different PN sequences. To reduce the overhead of the preamble, monocycle pulse is used to modulate one bit information of training sequence. The proposed scheme includes acquisition...
Although OFDM has a lot of advantages similar to robust to multipath fading, spectral efficiency, it is very solicitous to synchronization inaccuracy which exists affected by Carrier Frequency Offset (CFO), in addition to Sampling Clock Offset (SCO). The synchronization error reduces the orthogonality, so the OFDM leads to degraded system performance. To improve the effectiveness of the system, we...
Interferences in cellular wireless networks (CWN) between central station (CS) and the terminal station (TS) have a direct impact on available throughput and represents the main capacity limitation, especially in networks with full frequency reuse among all CSs. More and more attention is being focused on a way of minimizing interferences. We are introducing a new Coordinated Channel Gain Estimation...
In this paper, we propose an iterative SSS detection scheme for neighbor cell search in 3GPP LTE systems. The proposed scheme contains three stages for each iteration. At the first stage, SSS is detected without channel information and a candidate cell is selected. Then a coherent detection is utilized with channel response estimated from the candidate's SSCH at the second stage, in which a corresponding...
Accurate channel estimation for multiple cells is essential in downlink coordinated multi-point (CoMP) transmission/reception. Therefore, this paper investigates a technique to improve the channel estimation for downlink CoMP in Long-Term Evolution (LTE)-Advanced. Particularly, the performance of data signal muting, i.e., muting data signals that collide with the channel state information reference...
We report on field trials using CoMP transmission in the downlink of a mobile radio network. Two new features enable over-the-air CoMP transmission from physically separated base stations and terminals. These are distributed synchronization and a fast virtual local area network. Using VLAN tags, terminals feed back the multi-cell channel state information to their serving bases where it is multiplexed...
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