The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Inter-cell interference is the main obstacle for increasing the network capacity of Long-Term Evolution Advanced (LTE-A) system. Interference Cancellation (IC) is a promising way to improve spectral efficiency. 3rd Generation Partnership Project (3GPP) raises a new research project — Network-Assisted Interference Cancellation and Suppression (NAICS) in LTE Rel-12. Advanced receivers used in NAICS...
The proliferation of GNSS-receiving mobile devices in the consumer market and the growth of the Intelligent Transportation Systems sector have raised a lot of interest in low-cost precise positioning. However, GNSS signal quality is degraded inside the metal body of a vehicle, which is where the antenna of a portable device is to be located. This article investigates the effect of antenna location...
In this paper, a novel receiver design is proposed which combines two different approaches: decision feedback equalization (DFE) and equal gain combining (EGC). To make these two approaches work efficiently, the system is implemented in the frequency domain which can make full use of the advantages of both approaches. Simulation results demonstrate that our proposed design achieves greatly improved...
Relay-assisted Device-to-Device (D2D) communication is an enhanced technology for D2D communication. With relay nodes' assistances, the communication distance of the D2D pair is extended and the quality of communication can be improved. This paper focuses on the achievable transmission capacity of relay-assisted D2D network while keeping a low outage probability of the cellular users. based on stochastic...
Device-to-Device (D2D) communication is considered to be a promising resource reuse technology for local users. Unlike the previous studies on centralized scheduling methods, we develop several distributed resource management schemes for D2D communication underlay cellular networks. In the distributed resource management framework, each D2D user independently decides the transmit resources and power...
This paper investigates the transmission capacity of the secondary network in overlaid ad hoc networks with multi-antenna spatial multiplexing. Based on stochastic geometry tools, we study the effects of the node density and the transmission power of the secondary network on the transmission capacity performance. We derive the optimal node density for the secondary network, and subsequently the optimal...
Device-to-Device (D2D) communication underlaying cellular networks can enhance the network capacity and spectrum efficiency when sharing cellular resources. However, the severe interference between D2D and cellular networks may lead to performance decrease of D2D and cellular communication. In this paper, we concentrate on suppressing the interference between D2D users and cellular networks when D2D...
Cooperative diversity is an effective transmission technique allowing multiple users to create a virtual antenna array although each of them is equipped with single antenna. In this paper, an iterative channel estimation and equalization (ICEE) scheme for single-carrier transmissions is proposed, realizing space-time block code (STBC) with amplify-and-forward (AF) relaying in a distributed fashion...
This paper introduces an algorithm to determine relative position between rover GNSS receivers. Other than the simple way of subtracting two coordinates, the proposed method is based on the code-phase differences. Pseudorange measurement differences are calculated directly, and the position difference can be derived as a solution to the linearized equation of pseudorange measurement. Principles and...
Device-to-Device (D2D) communication will become an important technology in future networks with the increase of the requirements of local communication services. The interference between cellular communication and D2D communication can be coordinated by proper power control and resource allocation. In this paper, we analyze the resource allocation methods for D2D communication underlaying cellular...
In recent years, M2M (machine to machine) communications has increasingly been seen as a new growth area for wide-area wireless technologies which were designed for voice and high-speed packet data applications. In this paper, we use simulations to estimate the capacity of M2M applications over one of the widely used 3G wireless systems, CDMA2000 1x. We present capacity estimates of the CDMA2000 1x...
60 GHz millimeter wave technology has become an attractive solution for wireless communication in the most recent market. In the draft of IEEE 802.11ad standard, two modulation schemes are being considered in the design of physical (PHY) layer, namely, Single-Carrier (SC), and Orthogonal Frequency Division Multiplexing (OFDM). In this paper, the error performances of both coded modulation schemes...
In this paper, a 2.125GBd 10bit Serialize/Deserialize (SERDES) system has been implemented, transmitter section and receiver section are capable of working simultaneously. A new architecture of CDR and PLL has been proposed. The same coarse loop is used in the PLL and CDR to set each digital control bits of VCO. And a pre-emphasis driver is utilized to compensate for the high frequency attenuation...
To ensure Evolved-Universal Terrestrial Radio Access Network (E-UTRA) or Long Term Evolution (LTE) can coexist with other mobile systems operating in the same geographical area, coexistence studies involving E-UTRA are ongoing in the 3rd Generation Partnership Project (3GPP). Related work is also on the way in China Communications Standards Association (CCSA) which may influence the allocation of...
A novel transmission and retransmission scheme is proposed in this paper, which integrates Superposition Coding (SC) with Network Channel HARQ (NC-HARQ). First of all, the scheme is proposed through the design of the transmission and retransmission flows. Then the channel capacity and the transmission efficiency of the proposed scheme and conventional schemes are formulated and analyzed. The scheme...
This paper presents a performance comparison between a circuit-based CDMA2000 1x voice system and LTE VoIP system, in terms of capacity, air link latency and link budget. The performance comparison is based on link and network level simulations using a common evaluation methodology. The voice capacity of existing CDMA2000 1x is about 14% better than that of VoIP over LTE (based on 3GPP-Release 8)...
Today, many wireless devices are mobile and battery powered, which means that the service duration is highly dependent on energy consumptions and battery capacities. Based on the fact that battery capacity is still limited, energy saving is an important issue in wireless communication. Many methods have been proposed to save energy in wireless communication, such as power-aware routing and sleep mode...
LTE-advanced system which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). In this paper, we propose a novel cooperative multi-cell multiple-input multiple-output (MIMO) scheme for LTE-advanced system to reduce ICI and improve the cell capacity. By sharing information such as data and channel...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.