Match!
Zhifeng Zhang
Tongji University
9Publications
3H-index
27Citations
Publications 9
Newest
#1Wei Yu (Tongji University)H-Index: 1
#2Fusheng ZhuH-Index: 1
Last.Zhifeng Zhang (Tongji University)H-Index: 3
view all 6 authors...
This paper proposes a novel symbol-level combining hybrid automatic repeat request (HARQ) scheme based on analog chaotic code and named HARQ-Chaotic. The transmitter of HARQ-Chaotic adopts analog chaotic code to encode Quadrature Amplitude Modulation (QAM) symbols of retransmission packets to combat fading and noise. As the analog chaotic code can only handle sources with amplitudes in the range of [-0.5, 0.5], QAM symbols must be scaled into this range. We derived the optimal scaling factor thr...
Oct 23, 2018 in ICC (International Conference on Communications)
#1Chengcheng Wang (Tongji University)
#2Pengfei Xia (Tongji University)H-Index: 1
Last.Zhifeng Zhang (Tongji University)H-Index: 3
view all 5 authors...
With the development of wireless video technology and embedded technology, a dedicated digital signal processor (DSP) can achieve the video transmission stably and flexibly. Some existing wireless video transmission algorithms do not perform well in response to complex channel environments. A pseudo-analog video algorithm that can be run in a dedicated instruction set was proposed. At the transmitter, the image data which are removed spatially redundant are divided into L-shaped blocks for power...
#1Xin-Lin Huang (Tongji University)H-Index: 10
#2Jun Wu (Tongji University)H-Index: 10
Last.Minghao Wu (ZTE)H-Index: 1
view all 6 authors...
In vehicular ad-hoc network (VANET), the reliability of communication is associated with driving safety. However, research shows that the safety-message transmission in VANET may be congested under some urgent communication cases. More spectrum resource is an effective way to solve transmission congestion. Hence, we introduce cognitive radio (CR) enabled VANET (CR-VANET), where CR device can detect possible idle spectrum for VANET communications and assist to timely broadcast safety-message. Giv...
#1Lu Qiu (Tongji University)H-Index: 1
#2Min Wang (Tongji University)H-Index: 1
Last.Xin-Lin Huang (Tongji University)H-Index: 10
view all 5 authors...
Seamless rate adaptation (SRA) is one of the promising rate adaptive schemes for wireless communication system. However, the high complexity of decoding hinders its application. We propose an optimized Application-specific integrated circuit (ASIC) design and implementation for SRA decoder in this paper. In order to balance speed and resource consumption, a partial parallel architecture is used in SRA decoder, which consists of 8x8 parallel computation unit, each computation unit calculates deco...
#1Zi Teng (Tongji University)H-Index: 1
#2Jun Wu (Tongji University)H-Index: 10
Last.Zhifeng Zhang (Tongji University)H-Index: 3
view all 4 authors...
Aug 1, 2014 in ICC (International Conference on Communications)
#1Yuan Luo (Tongji University)H-Index: 1
#2Zhifeng Zhang (Tongji University)H-Index: 3
Last.Xin Chen (Tongji University)H-Index: 2
view all 5 authors...
Signal processing requires high performance digital signal processors(DSP) and hardware accelerators. Real and complex multiply-accumulate(MAC) units are the most critical computation units in the DSPs and accelerators, which greatly impact the performance, power and chip area of the signal processing system. A fixed-point Single-Instruction-Multiple-Data(SIMD)/vector MAC architecture is presented in this paper. It supports 8-bit/16-bit/32-bit real and complex MAC operations. The proposed vector...
Aug 1, 2014 in ICC (International Conference on Communications)
#1Lu Qiu (Tongji University)H-Index: 1
#2Min Wang (Tongji University)
Last.Xin-Lin Huang (Tongji University)H-Index: 10
view all 5 authors...
Recently, the research on rate adaption at receiver has caused widespread concern. Seamless rate adaptive (SRA) is one of the promising rate adaptation schemes for wireless communication system. However, the high complexity of decoding hinders its application. The graphics processor unit (GPU) is able to provide a low-cost and flexible software-based multi-core architecture for high performance computing. This paper proposes a GPU design and implementation for SRA decoder. Firstly, we discuss th...
Jun 1, 2014 in IV (Intelligent Vehicles Symposium)
#1Wenfeng Li (Tongji University)H-Index: 3
#2Jun Wu (Tongji University)H-Index: 10
Last.Zhifeng Zhang (Tongji University)H-Index: 3
view all 4 authors...
In this paper, we derive application-level reliability metrics of various safety applications with worst-case settings and vehicular environments based on an accurate analytical model in one dimension vehicular communication networks. The reliability related QoS metrics in both the MAC-level and the Application-level including packet reception ratio, T-window reliability, and awareness probability are derived. Inspired by the correlation between road traffic and vehicle speed revealed by Greensh...
1