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The power consumption schemes of consumers is an important issue in energy management process in smart grid. The non-cooperative methods which are always considered cannot achieve the maximized performance for consumers and networks. In this paper, we propose a cooperative power consumption scheme for consumers based on coalition formation game, which is suitable for the general electricity markets...
An efficient and reliable multi-access scheme for large-scale Vehicle Communications Network (VCN) is necessary in future. In this paper, a compressed multi-access scheme is proposed for MIMO-based VCN via compressive sensing (CS) techniques. In particular, a Zero-Forcing (ZF) based random precoding scheme is proposed for vehicles to combine the advantages of MIMO and CS. Correspondingly, an iterative...
In this paper, the superimposed training strategy is introduced into the OFDM modulated amplify-and-forward (AF) two-way relay network (TWRN) to simplify the channel estimation at the destination, and the closed-form Bayesian Cramér-Rao lower bound (CRLB) is derived for the estimation of block-fading frequency-selective channels, which is used to guide the optimal training design. Through the superposition...
For 3GPP long term evolution (LTE) uplink, reference signal (RS) is an important kind of physical signal which is primarily used for demodulation and channel sounding. However, in the multiple-beam satellite environments, the inter-beam and intra-beam interference will break the orthogonality of uplink RS (UL-RS) from different user equipments (UEs), resulting in system performance degradation. In...
Reference signal (RS) is a crucial signal which is used for channel estimation and data demodulation in 3GPP long term evolution (LTE) system. However, due to the differences of channel environment, interference situation and system physical resource between multiple-beam satellite system and terrestrial system, the original downlink reference signal (DL-RS) design in LTE specifications cannot meet...
In this paper, we present a pilot assisted two-way relay network (TWRN) single-carrier frequency domain equalization (SCFDE) system with no cyclic prefix (CP), where two source terminals exchange their information through a relay terminal using the amplify-and-forward relaying scheme. During Phase I of the proposed system, two source terminals transmit the orthogonal pilot sequence and the single-carrier...
Based on the characteristic that received signals of different beam cells are sent to the same gateway station in the multi-beam satellite system, this paper introduces a technique of multi-beam joint detection combination for TD-SCDMA compatible mobile satellite communication system. The proposed technique adopts Adjacent Beam Assisted Single-beam Joint Detection (ABA-SB-JD) technique to get the...
The uplink capacity of GEO satellite mobile communication system compatible with TD-SCDMA is presented in this paper. An analysis on the interference and system capacity in the specific system is made according to the multi-beam model based on HFDD. Verified by simulation, the analysis not only provides a theoretical foundation for network planning of satellite system based on TD-SCDMA in terms of...
In LTE system, sounding reference signal (SRS) is transmitted for channel detection to obtain uplink scheduling gain. However, in multiple-beam mobile satellite communication system (MMSCS), large inter-beam and intra-beam interference destroy orthogonality for SRS from different users and lead to lower received SNR. Subsequently, the system cannot predict the channel exactly and will suffer from...
In order to overcome delay-sensitive shortcoming of satellite communications system based on Time Division Duplex mode, a scheme of acquiring propagation delay of any place within a spot beam is proposed. It is accurately calculated by space geometric model according to the satellite position ranging results by three calibration stations. Based on actual system parameters in China, the influence on...
A new noise variance based reduced maximum likelihood decision feedback equalization (ML-DFE) algorithm has been developed. This algorithm reduces the calculation complexity by exploring the intrinsic statistical properties layer by layer. Through setting layered thresholds, part of the nodes in the searching process will be cut by comparing with the thresholds. Simulation results show that the complexity...
Low-complexity joint power allocation and route planning algorithm for multiple antennas wireless sensor networks (WSN) is introduced in this paper. The Quality-of-Service (QoS) aware packet forwarding problem is cast into the framework of dynamic programming, such that adaptive power allocation can be jointly realized at each hop. State space partition techniques and state aggregation approximation...
Adaptive Modulation and Coding (AMC) is one of the most promising techniques to cope with the dynamic fading of wireless channels, adopted by emerging standards such as LTE and WiMAX. In satellite communications, the upper bound of AMC adjustment period is determined by both long round-trip delay and different channel coherence time. In this paper, the impact of AMC adjustment period in mobile satellite...
In mobile satellite communication systems, Doppler shift is caused by the movement of both unified equipment and satellite, and differs from that in terrestrial mobile communication. Therefore, in OFDM based mobile satellite communication systems, the selection of sub-carrier bandwidth should be different. In this paper, the characteristic of Doppler shift in the satellite communication is analyzed,...
LTE-based mobile satellite communication system is a combination of terrestrial LTE system and satellite communication techniques, which aims at improving the current LTE system's technical specifications for better service quality. AMC (Adaptive Modulation and Coding) technique is applied in current LTE system to improve system capacity and data transmission efficiency. CQI (Channel Quality Indicator),...
In this article, we propose a low-complexity joint power allocation and route planning algorithm for multiple antennas wireless sensor networks using dynamic programming. The sensor nodes utilize orthogonal space time block codes with demodulation-and-forward protocol. Unlike the previous work which typically optimize all the parameters, we cast this Quality-of-Service aware packet forwarding problem...
Channel prediction is the premise for the application of adaptive transmission in mobile satellite communications with long propagation delay. Particularly, in GEO mobile satellite communication systems, the satellite channel correlation characteristics are analyzed for the mobile terminals at different positions and along different directions, and the predictability of the satellite channel is discussed...
The detection of multiple-input multiple-output (MIMO) system is an important issue. The K-best sphere decoding (K-best SD) is a promising technology for the MIMO detection. But the complexity of the K-best SD is very high. In this article, a new algorithm is proposed to simply the complexity of the K-best SD. Through analyzing the statistics character of the channel matrix, we propose that the number...
In this paper, other spot-beam interference value is studied based on a mobile satellite system (MSS) compatible with TD-SCDMA by theoretical analysis and numerical simulation. A system model to calculate the interference value is presented by making assumptions such as perfect power control and uniformly distributed users. Numerical results of other spot-beam interference value with different frequency...
Tree search is an important kind of detection method. It can be used in multiple-input multiple-output systems detection and the multi-user detection. In this paper, a novel adjustable reduced metric-first sphere decoding algorithm for tree search has been proposed. By setting a suitable and adjustable threshold, the proposed algorithm cuts nodes whose partial Euclidean distances are larger than it...
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