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In this paper, we study a joint source and relay pre-coding technique for multiuser multi-relay that help to maximize sum rate (SR) for Multiple-Input Multiple-Output (MIMO) link. Here we proposed two-hop precoding technique by implementing Zero-Forcing (ZF) as source precoder and Dirty Paper Coding (DPC) as relay precoder. We show performance by simulating and show that ZF-DPC (i.e., ZF at source...
This paper presents a new coding scheme that considerably increases the efficiency of the channel in multicast setting. Specifically, we study the scenario where three terminals exchange their messages via a satellite gateway. The main difference between the proposed scheme and conventional three-way relay channel is the use of joint channel and network coding. This allows three terminals to transmit...
Document copy detection is an effective method that can protect intellectual property rights as well as improve the efficiency of information retrieval. To our knowledge, it is a common method that using the fingerprints of one document in the process of detecting. Therefore, selecting the appropriate document fingerprints plays a key role. This paper firstly describes several mature methods of selecting...
Cooperative communication is a bright technology to acquire diversity gain in wireless terminals by sharing their antennas. With the fixed amplify-and-forward (AF) mode, relay node always helps to relay the data of the source node with unchanged transmission power. Judging from the power efficiency, it is obviously not optimal, particularly when channel states are quite good. An adaptive AF mode is...
By pairing the mid and edge sub-bands of each channel, the penalty due to inter-channel-interference can be mitigated for a superchannel. Experimental results show that the proposed method offers 1.5-dB Q2 improvement after 3840-km transmission with 1GHz channel overlap.
In wireless communication, Multi-Input Multi-Output (MIMO) technology offers significant increase in data throughput and link range without additional bandwidth. The dirty paper coding (DPC) achieves the sum rate capacity of Gaussian MIMO broadcast channel. The dirty paper coding is a technique for efficient transmission of digital data through a channel that is subject to some interference that is...
This paper discusses a possible program for improving the outer (converse) bounds on the finite-blocklength performance of multiple-access codes. The program is based on a certain conjecture involving Rényi entropy of a sum of two independent binary vectors. Some partial results towards showing the conjecture are presented. The problem of bounding the joint Rényi entropy in terms of the marginal entropies...
In this paper, two issues in assessing the performance of superposition coding (SC) in the downlink Long Term Evolution (LTE) are investigated. The first issue is the prediction of user's signal-to-interference-plus-noise ratio (SINR) at the scheduler based on the user's channel state information (CSI) feedback, when the actual transmission scheme is different from the scheme used for CSI computation...
Transform Domain Communication System (TDCS) has been proposed as a new candidate applied in the cognitive radio (CR) environment since it can avoid existing users or jammers intelligently over a given bandwidth. The TDCS achieves noise-like property and orthogonality characteristic by generating a PR phase vector through a random phase coding processing. In this paper, a new implementation of TDCS...
In this paper the robustness of the receiver architecture of GSM/EDGE modems is experimentally tested. GMSK and 8PSK modulated signals are used to simulate interference sources on adjacent channels. The results can help to fathom the boundaries for future spectrum allocation strategies leading to more efficient utilization of the available spectrum.
Radiated interference environments can significantly degrade the performance of the digital communication systems that are widely used today. Problems from such intersystem interference might need to be analyzed beforehand or as problems occur. Another application where such analysis is of interest is in systems using dynamic allocation of spectrum, where it serves as basis for spectrum allocation...
The Cognitive Multiple Access Z-Interference Channel consists of a MAC channel that receives interference from an external transmitter. In a previous work we studied this model where both MAC users are cognitive and showed that an encoding scheme based on Dirty Paper coding attains the capacity region for the Gaussian case. In this work we assume that only one MAC user is cognitive and show that the...
This paper proposes a cooperative scheme for in-band full duplex (IFD) in a one-way two-hop relaying system. The proposed scheme realizes collocated space-time block coding by applying both of the superposition coding at the source and the IFD mode at the relay. The achievable rate of the proposed scheme is derived for fixed relay channel gains and compared to those of the upper-bound IFD as well...
Compressive data gathering (CDG) has emerged as a useful method for collecting sensory data in large scale sensor networks; this technique is able to reduce global scale communication cost without introducing intensive computation, and is capable of extending the lifetime of the entire sensor network by balancing the aggregation and forwarding load across the network. With CDG, multiple forwarding...
As machine-type communications (MTC) penetrate deeper into our everyday life, alternative access models are considered for them. In particular, instead of a traditional multi-hop mesh topology (a.k.a. capillary network), recent works have suggested the use of a cellular network to cover massive numbers of MTC devices with a one-hop deployment (specifically, 3GPP LTE). This significantly reduces the...
It is well known that separate coding on each carrier is capacity-achieving in parallel Gaussian multiple-input multiple-output (MIMO) broadcast channels in the sense that the sum rate capacity under a sum power constraint is achievable with separate coding if the noise is independent on each carrier. In this paper, we generalize this statement by proving that the optimality of separate coding also...
We consider zero-delay analog coding of a Gaussian source over a Gaussian channel with additive correlated Gaussian interference known to the transmitter. The receiver aims to jointly estimate the source signal and the state interference. We propose a layered parametric analog coding scheme based on linear and sawtooth mappings. We derive an upper bound on the distortion for the parametric scheme...
We study the impact of heterogeneity of channel-state-information available at the transmitters (CSIT) on the capacity of broadcast channels with a multiple-antenna transmitter and k single-antenna receivers (MISO BC). In particular, we consider the k-user MISO BC, where the CSIT with respect to each receiver can be either instantaneous/perfect (P), delayed (D), or not available (N); and we study...
We propose a novel interference management framework for the cellular downlink through cooperative transmission. A sectored cellular network is studied where the interference is only due to sectors in neighboring cells and intra cell interference is ignored. We first explore the potential degrees of freedom (DoF) gain in a scenario where mobile receivers can be associated to any neighboring cell but...
Topological interference management is the study of achievable rates within communication networks with no channel state information at the transmitter (CSIT) beyond knowledge of the network structure itself. In this paper, we consider topological interference management within the context of a two-cell two-user-per-cell interference broadcast channel (IBC) with alternating connectivity. Topological...
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