Zobrazeno 1 - 10
of 51
pro vyhledávání: '"ZHANG Qin-yu"'
Publikováno v:
Tongxin xuebao, Vol 32, Pp 8-14 (2011)
A novel multi-services transmission scheme based on multi-chirp-rate CSS was proposed,which provided dif-ferent quality of transmission to services on the physical layer.Using fractional fourier transform（FrFT）,signals of dif-ferent services coul
Externí odkaz:
https://doaj.org/article/4e9460a631764a3c8d8690faf9f616a7
Publikováno v:
Tongxin xuebao, Vol 32, Pp 10-16 (2011)
The multipath and NLOS distance errors in indoor positioning due to the propagation characteristics of IR-UWB were analyzed,based on the coherent TOA ranging algorithm.Utilized the statistical information of IEEE 802.15.4a channel model,the multipath
Externí odkaz:
https://doaj.org/article/2b571222d9e848feaac227e26a7a32cc
Publikováno v:
Tongxin xuebao, Vol 31, Pp 67-75 (2010)
A novel method based on clustered point process was proposed to calculate average bit error probability（ABEP） of UWB non-coherent system on IEEE 802.15.3a channel.In particular,the expectation and variance of the sig-nal to noise ratio（SNR） i
Externí odkaz:
https://doaj.org/article/dfb387801c6549898b6f1619273d53ba
Publikováno v:
Tongxin xuebao, Vol 30, Pp 135-140 (2009)
The cooperative detection in cognitive radio system was investigated based on multi-sensor data fusion. For a certain scale of the online users, an optimal user number participating in data fusion existed. Based on this fact, a measure-based fusion m
Externí odkaz:
https://doaj.org/article/7e2b665ba9334747b52e6cae3c6d6349
Publikováno v:
Tongxin xuebao, Vol 30, Pp 96-104 (2009)
In order to design a low computational and cost ranging method for the IR-UWB （impulse radio ultra wideband） wireless sensor network, a two-step DP （direct path） component TOA （time of arrival） estimation algorithm based on energy detecti
Externí odkaz:
https://doaj.org/article/9f9f40a9a830478eb6adb787ae751b0a
Publikováno v:
Tongxin xuebao, Pp 111-117 (2007)
In general,QoS guarantee is the basic element for a communication system in the real world.Accordingly,the relationship between transmission power and SINR was investigated,as well as the relationship between SINR and data rate.And different QoS requ
Externí odkaz:
https://doaj.org/article/8cfa63e832584b118c3722777e643860
Publikováno v:
Tongxin xuebao, Pp 107-111 (2005)
Recently,the ultra-wide band （UWB）-based technique is focused on more deeply along with the design of MAC （media access control） for its advantages.Comparing with the conventional wireless communication system,the UWB system has its unique ch
Externí odkaz:
https://doaj.org/article/a5eab7bb4c874befbc9f28593ab5f84c
Publikováno v:
Tongxin xuebao, Pp 149-154 (2005)
A new method based on BP neural networks was proposed here to implement the fast acquisition of UWB signals with the condition of low SNR.The BP neural network was used to match the extreme short pulse in this study.It could improve the performance o
Externí odkaz:
https://doaj.org/article/71e55e4fa0794a658591c07b771c0d62
Akademický článek
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Publikováno v:
EURASIP Journal on Wireless Communications and Networking, Vol 2011, Iss 1, p 77 (2011)
Abstract In this paper, we discuss a potential multiple access and modulation scheme based on polarized states (PS) of electromagnetic (EM) waves for line-of-sight (LOS) communications. The proposed scheme is theoretic different from the existing pol
Externí odkaz:
https://doaj.org/article/3ea2475a6d484ce7b171224ef78a8ffb