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This paper focuses on the compression of complex baseband samples between baseband units and radio subsystems, such as LTE-A with distributed architecture. Considering the constraints of wireless system in signal delay and hardware implementation, we propose a modified AGC algorithm module with low-latency and low-complexity, which significantly lowers the data rate while maintaining an acceptable...
The recent development of mobile terminals, the proliferation of mobile applications and the increasing need for mobile data have led to a dense deployment of mobile networks. In this context, the Long Term Evolution (LTE) standard is adopted by a large number of mobile network operators. LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) technique on the downlink of the radio interface...
Femtocells were proposed as a solution to improve the performance in dense networks. They complement the macro base stations (eNB) with a dense set of low power micro base stations (HeNB). However, they also bring increased interference problems and consequently more collisions and lost packets. This paper considers the use of femtocells running the Single Carrier with Frequency Domain Equalization...
In cellular networks, Device-to-Device (D2D) links can be utilized for data dissemination via unicast or/and multicast within a cluster. For traditional D2D relay schemes, D2D links with poor channel conditions may be the bottleneck and result in conservative resource utilization. Therefore, we suggest preferentially selecting the good quality D2D links with high achievable data rates, which induces...
The increasing popularity of mobile devices, such as smartphones, has changed the way people access and manage data. In particular, with the increased capabilities of mobile phones, many services are now available and routinely used on the go (e.g., home banking, e-commerce, remote work, internet access and entertainment). As a result, more and more confidential data is now stored on these devices,...
In power system, consumers' power demand are highly desirable information by grid operators for asset management and grid operation. However, users may hesitate to report such private information due to the potential privacy leakage risk and other extra cost. A compulsory-based scheme which forces consumers to reveal private data, or a punishment scheme in which consumers get penalty for unwillingness...
Containing interference within cellular communication systems requires the use of dedicated frequency bands to mitigate interference from other wireless systems. Based on this design principle, the Radio Frequency (RF) resources of a multi-Radio Access Technology (RAT) cellular system are apportioned between co-deployed RATs. However, traffic variations within multi-RAT systems result in the suboptimal...
A monopole plasma antenna for Wi-Fi application at 2.4 GHz was constructed using a commercially available fluorescent tube. The plasma antenna uses a fluorescent tube with length and diameter of 0.61 m and 0.025 m, respectively. The tube contains a mixture of argon and mercury vapor, which becomes conductive when sufficiently ionized into plasma state, allowing transmissions of radio frequency signal...
In this paper, we present several schemes of N rings star M-ary quadrature amplitude modulation (NR-MQAM) with independent bit mapping. The theoretical expression of symbol error rate (SER) for NR-MQAM is derived and compared with that of cross or square MQAM. For NR-MQAM, the ring ratio is selected based on the principle that its cubic metric (CM) value is equal to that of cross or square MQAM. The...
The paper presents an innovative antenna structure by incorporating a reconfigurable planar array antenna with parasitic elements, in which it comprises of two truncated rhombus-like slotted patch antennas in back-to-back configuration. The antenna emphasizes on these two design elements: slotted patch and parasitic elements to reconfigure its frequency and radiation pattern, respectively. On top...
The increasing interest drawn to LTE system requires the analysis of train-ground communication channel. By the approval of the Ministry of Railways of China, extensive and practical measurements are performed on Harbin-Dalian railway with a speed up to 370 km/h. Both large-scale and small-scale fading characteristics are specified. Firstly, path loss and shadowing effect are evaluated based on the...
The architectural structure of Radio Access Networks (RANs) in Multi-Radio Access Technology (RAT) cellular systems is based on the independent iteration of single RAT RANs and statically dividing radio frequency resources between co-deployed RATs, leading to high system complexity and suboptimal spectrum utilization. This paper proposes the unification of RAN operation and presents a scalable RAN...
We design and assess some practical low-density parity-check (LDPC) coded transmission schemes for the Gaussian broadcast channel with confidential messages (BCC). This channel model is different from the classical wiretap channel model as the unauthorized receiver (Eve) must be able to decode some part of the information. Hence, the reliability and security targets are different from those of the...
Cognitive radio is an emerging technology that is used to solve the problem of scarce spectrum resource utilization. Among its fundamental functions, the most important is the spectrum sensing which requires high accuracy and low complexity particularly at very low signal-to-noise ratio (SNR) values. In this paper, we discuss a recently proposed spectrum sensing detector [1] which explores the sparsity...
A coordination strategy among a large cellular MIMO network is presented in this paper. With clustered linear precoding and dynamic frequency reservation techniques, JDFR-BDGMD (Joint Dynamic Frequency Reservation and Block Diagonalization precoding with Geometric Mean Decomposition precoding scheme) greatly mitigates intra-cluster interference as well as inter-cluster interference in the downlink...
We propose a low-complexity transmission strategy in multi-user multiple-input multiple-output downlink systems. The adaptive strategy adjusts the precoding methods, denoted as the transmission mode, to improve the system sum rates while maintaining the number of simultaneously served users. Three linear precoding transmission modes are discussed, i.e., the block diagonalization zero-forcing, the...
In multiusers MIMO Interfering Broadcast Channels with limited feedback, there are quantization errors of quantized channel direction information (CDI). The system sum-rate performance will certainly degrade due to designing precoder with mismatch channel state information. Using tools from random matrix theory, some statistical characteristics of quantization error for CDI are obtained, and a precoder...
Radio frequency (RF) energy harvesting is an emerging technology that will enable to drive the next generation of wireless sensor networks (WSNs) without the need of using batteries. In this paper, we present RF energy harvesting circuits specifically developed for GSM bands (900/1800) and a wearable dual-band antenna suitable for possible implementation within clothes for body worn applications....
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