mac cosmetics wholesale td-scdma and wcdma network

[v7312937]

TD-SCDMA and WCDMA network in the joint feasibility study


X) a (Gt + Gr) (2) where: the level of isolation Lh formula expressed in decibels for the propagation constant 22.0; d level of the interval for sending and receiving antennas; into the antenna operating wavelength; Gt, Gr are the transmit and receive antenna gain. Of WC-DMA omnidirectional antenna with a gain of lldBi, TD-SCDMA Antenna 7dB increase on this basis,ghd planchas, the shaping gain of 18dBi, a total of two base stations appear when a coupling gain of 6dB, so a 11 +11 + 7 - 6 = 23dBi. Isolation of L is 87dB, a wavelength of 3 × 10. / 1922.5 × 10 a 0.1560m, then the horizontal separation distance of 3918.54m. Through MATLAB simulation, Figure 1 shows different levels of isolation distance of isolation. . ,. - ... .... I = insect control I Lei Jian isolation distance (m) Figure 1 vertical isolation Lv formula expressed in decibels as type: Lv = 28. O +401 og (d / D (3) where: 28.0 is the propagation constant; into the day as the wavelength: d for the vertical separation distance. Similarly, the generation to take the above values ​​calculated to achieve 87dB of isolation requirements, the need for vertical separation distance of 4.66m. analysis of horizontal and vertical isolation isolation formula shows, when the vertical separation, isolation and get vertical 2009.4 distance was 40 times the logarithm of the relationship, that is When the vertical distance increased 10 times, isolation will increase 40dB, and for the level of segregation, isolation can only be increased 20dB. Meanwhile, the level of isolation need to consider when sending and receiving antenna gain, which is large extent, also increased the level of isolation distance required by MATLAB simulation, Figure 2 shows the different vertical separation distance of the isolation of vertical distance (m) Figure 2 can be seen from the above analysis, WCDMA and TD-SCDMA base station to to achieve 87dB of isolation, need to 3919m horizontal isolation distance required is too far away, in practice only by increasing the external bandpass filter to solve, but to assess the use of external band-pass filter network coverage and capacity of . 4.66m required vertical separation of antenna height difference, which shows that both total station construction is entirely possible, as long as the antenna height difference by mutual interference problem can be solved for the case of the construction site were required to handle the vertical separation and horizontal distance from the combination of isolation, if the limit as the actual scene can not achieve the minimum distance set of wireless stations, you need an additional external band-pass filter if necessary, to the wireless network design and make appropriate adjustments or optimize the network to compensate for the use of external band-pass filter network coverage and capacity of the adverse effects. 4 Conclusion This paper discusses TI)-SCDMA and WCDMA network combined the two possible scenarios, and its possible were studied, focusing on analysis of WCDMA base stations TSCDMA interference. Accelerate the pace of commercialization of TD, while for the coexistence of multiple systems to build 3G network to provide some reference. References [1] Li XW, Li Guiyong, Chen Xianliang. TD-SCDMA third generation mobile communication systems, signaling, and to achieve [M]. Beijing: People's Posts & Telecom Press, 2003. [2] Li Shihe. Third generation mobile communication standards [M]. Beijing: People's Posts & Telecom Press, 2003. [3] Peng Mugen, Wang Wenbo. TDD-CDMA system uplink access control algorithm [J]. Beijing University of Posts and Telecommunications, 2004,tory burch outlet,27 (5). [4] Peng, Sunjia Chen, Xiang Wen-Sheng, et al. Conformance testing of TD-SCDMA technology research [J]. Communication World, 2005,1. [5] Song from the column. Of TD-SCDMA RF Measurement Technology [J] _ China Radio, 2006,4. [6] Zhang Jing, Yu thinking clear, and so on. TD-SCDMA uplink enhancement technology research [J]. Telecommunications, 2006,22 (11) :84-87. [7] Yang Weifan,mac cosmetics wholesale, where white. Hybrid network TD-SCDMA and WCDMA network planning study [J]. China Radio, 2006,03. [8] Wang silver. TD-SCDMA base stations with a total capacity of WCDMA system problem [J]. Telecommunications engineering technology and standardization,tory burch outlet, 2007,04. Author Zhang Hongfeng, (1984 -), male, native of Chongqing, Chongqing University of Posts and Communication and Information System Master, research direction: the third generation mobile communications. E-mail: zhfcmx @ 163. corn Tun Sook ELE0TRONlCTEST
More articles related to topics：


p90x workout schedule final cut pro side of the be

tory burch outlet Safety equipment functional integration is the trend

tory burch outlet Venture capital financing - guar