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The 2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) was successfully held in Harbin, China on August 17–19, 2011. This year's conference continued its tradition of being the premier forum for presentation of results on cutting-edge research in telecommunications and networking, bringing together Chinese and international researchers and practitioners for...
Under the time variant and fading HF channel, an improved Multicarrier CDMA System using Frequent Domain Differential Detection (MC-FDDD-CDMA) for low SNR links is proposed. With synchronization errors, including frequent offset and timing offset, we analyze the system BER performance under the fast fading HF channel, where the adjacent subcarriers have different channel responses. The results show...
IEEE 802.15.4g is a recent standard for Smart Utility Networks (SUN). SUN is a house-to-house level subordinate network in the Smart Grid network. IEEE 802.15.4g uses a Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) algorithm for channel access whose performance is limited by collision probability. In this paper, we propose a multi-channel CSMA/CA operation in IEEE 802.15.4g system to...
Spatial Modulation (SM), is a new multiple antennas transmission technique for broadband wireless communications. In this paper, SM is firstly combined with single-carrier (SC) transmission systems for the merit of low peak average power ratio (PAPR) over conventional SM-orthogonal frequency division multiplexing (OFDM). Furthermore, for SM-SC systems, different detection techniques such as linear...
Compressed sensing (CS) is a recently developed theory that has earned increasing interests in the area of wireless communications and signal processing. It states that the main information of a signal can be recovered from a relatively small number of linear projections. Event detection is an important application of wireless networks which has also attracted much attention. Recent research shows...
In this paper, a new joint feedback and scheduling scheme based on the users' satisfaction has been proposed. The scheme divides the users into different groups based on the QOS of users and calculates the users' satisfaction. Based on the satisfaction, the scheme takes it as scheduling weight of ZFBF-SUS in real-time users. Also, the scheduling weight of non-real-time users has been analyzed. It...
How to improve the efficiency of resource allocation and the performance of interference suppression has always been the essential issue and motivity of technology revolution in wireless communications. As to the issues of resource allocation and performance improvement in complex time-frequency fading channels, the proper time-frequency mathematics methods are encouraged to be utilized. Our research...
The dynamic spectrum access technology can achieve near-optimal spectrum utilization by allowing cognitive users sense and utilize available spectrum opportunistically. Time overhead and fairness are part of the key evaluation criteria for the spectrum allocation algorithms, and a naive spectrum assignment can lead to significant unfairness and system overhead. In this paper, based on graph coloring...
In traditional cognitive radio (CR) network, secondary users (SUs) are always assumed to obey the rule of “introducing no interference to the primary users (PUs)”. However, this assumption may be not realistic as the CR devices becoming more and more intelligent nowadays. In this paper, with the concept of light-handed CR, which is proposed to deal with the above mentioned problem by enforcing “punishment”...
Focusing on the low throughput of fair subcarrier allocation in cooperative OFDMA system, an improved algorithm with single subcarrier capacity threshold and cooperative power factor is proposed. In this algorithm, the users with bad channel can not occupy too many subcarrier, and the power for cooperating with other users of users with good channel is limited. Simulation results show that this algorithm...
The signal of a hypersonic spacecraft entering the earth's atmosphere may be lost at a certain altitude transitorily. This phenomenon is called ‘blackout’, which is an important performance of aircraft design. Recently, with the development of the near spacecraft, the communication techniques under the plasma environment are more and more important, with the realization of which can we record, monitor,...
In this paper, we propose a joint design of serially concatenated source channel coding for binary Markov sources over AWGN channels. To exploit the memory structure inherent within the sequence output from the source, modifications are made on the BCJR algorithm. To decode the outer code, the modified version of the BCJR algorithm is used, while the inner code by the standard version of the algorithm...
The research about error floor of finite-length LDPC code is a very hot topic recently. This survey briefly introduces the existing works in lowering and estimating error floor of LDPC codes, and sheds some light on some potential future research areas.
Non-binary LDPC codes offer higher performances than their binary counterpart but suffer from highest decoding complexity. A solution to reduce the decoding complexity is the use of stochastic decoding algorithm, but the computational complexity of probability generation in the first step is very high. In this paper, we propose a simple method to fast generate the probability especially in high-order...
Digital fountain codes can be applied into the file delivery in deep space communication for rateless and non-feedback characteristics. However, the code-length and typical sub-optimal algorithm are the two critical factors in deep space environment, which may guarantee the considerable decoding rate with power and buffer-limited equipment. In this study, a novel approach, dependent sequences compensation...
Generating accurate SI is crucial to the decoding performance and the quality of reconstructed frames in distributed multi-view video coding (DMVC). There have been some fusion methods between intra-view estimation and inter-view estimation to get accurate SI. In this paper, we present a new fusion scheme to get more accurate SI by exploiting the spatio-temporal correlation, i.e. the inherent spatial...
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