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Signal compression is essential for energy and bandwidth efficient communication and storage systems. In this paper, we provide two practical approaches for source compression of noisy sparse and non-strictly sparse (compressible) sources. The proposed schemes are based on channel coding theory to construct a source encoder that decreases the number of transmitted bits while preserving the fidelity...
In Uplink Coordinated multipoint (Uplink CoMP) schemes as in LTE [1], multiple base-stations (EnodeBs) receive signals from the same user equipment (UE). Combining this information appropriately using the backhaul is known to yield high gains, especially when the interference avoidance is used across the EnodeBs in CoMP. We consider a load-balanced, dense, small-cell deployment where a UE may be connected...
This paper focuses on linear precoding designs in multi-user multiple-input multiple-output block diagonalization (BD) relay systems with limited feedback. A base station employs spatial multiplexing transmission based on quantized channel state information (CSI) obtained from a relay. Then the relay transmits the received signal to users equipped with multiple antennas. In this paper, we propose...
This paper considers training-based transmissions in massive multi-input multi-output (MIMO) systems with one-bit analog-to-digital converters (ADCs). We assume that each coherent transmission block consists of a pilot training stage and a data transmission stage. The base station (BS) first employs the linear minimum mean-square-error (LMMSE) method to estimate the channel and then uses the maximum-ratio...
This paper studies a full-duplex filter-and-forward (FD-FF) relay system in frequency-selective channels. Conventionally, the loop-back signal at the FD relay is treated as harmful self- interference and needs to be significantly suppressed via both analog- and digital-domain cancellation. However, the performance of the conventional self-interference cancellation approach is fundamentally limited...
The capacity performance of ICIC has been extensively studied in coordinated multi-point transmissions (CoMP). In practice however, due to limited feedback, the acquired channel direction information (CDI), which is crucial for ICIC, is often partially available. Hence one may question whether the ICIC is able to meet the Quality-of- Service (QoS) requirements. This paper considers the optimal partitioning...
Abstract-We define a new class of modulations for wireless communication that use indelible electromagnetic signals to convey information. We describe the modulations' theory and show that they admit a large trade-space between data rate and security against hostile interference. We combinatorically analyze jammer attacks against the two presently known instances of these waveforms, and we explore...
Cloud radio access network (CRAN) is a promising candidate for the next-generation wireless communication systems. In CRAN, remote radio heads (RRHs) are deployed to serve users in a target area, which are connected to a central processor (CP) via limited-capacity links termed the fronthaul. In practice, the large amount of information transferred between each RRH and the CP for centralized processing...
In this paper we investigate the capacity of random wireless networks in which transmitters are equipped with multiantennas. A quantized version of channel direction information (CDI) is also available, provided by the associated single antenna receivers. We adopt tools of stochastic geometry and random vector quantization to incorporate the impacts of interference and quantization errors, respectively...
Uniform planar antenna (UPA) structures are expected to become popular for massive multiple-input multiple- output (MIMO) systems because they enable deployment of a large number of antennas in limited space. In frequency division duplexing (FDD) systems, quantized channel state information (CSI) should be fed back from users to base stations to make adaptive transmission possible. However, it is...
In this paper, we investigate the low-overhead feedback for statistical channel information in massive multiple-input multiple-output (MIMO) systems. As a promising technique for next generation cellular networks, massive MIMO has gained a lot of attention due to its ability to significantly improve the network performance. To reduce the feedback overhead in frequency division duplex systems, cascaded...
In this paper, a novel adequate and concise information extraction approach is explored to provide a promising alternative for manifesting the intrinsic structure of the cyclostationary signals, such as communication signals. A novel graph-based signal representation is proposed to interpret the spectral correlation function into a graph and its adjacency matrix. This graph can represent the proposed...
Abstract-Conventional cloud radio access networks assume single cloud processing and treat inter-cloud interference as background noise. This paper considers the downlink of a multi-cloud radio access network (CRAN) where each cloud is connected to several base-stations (BS) through limited-capacity wireline backhaul links. The set of BSs connected to each cloud, called cluster, serves a set of pre-known...
The paper studies the source coding (quantization) for the feedback of discrete-time and continuous-state cyber-physical systems (CPSs). It is formulated as a sequential coding optimization problem. The goal is to find a deterministic policy, as a series of mappings from the historical state information to the quantization strategy for the current feedback state. In particular, an optimization problem...
Recommender systems have been widely used to deal with information overload, by suggesting relevant items that match users' personal interest. One of the most popular recommendation techniques is matrix factorization (MF). The inner products of learned latent factors between users and items can estimate users' preferences for items with high accuracy, but the preferences ranking is time consuming...
Current perspectives for satellite communications are massively envisaging the introduction of a new generation of satellites based on semi-transparent transponder architectures. In this frame, technological constraints related to the development and implementation of novel payloads, that include significant on-board digital processing, call for careful system modeling and accurate digital hardware...
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