Field trial of an HTS filter system on a CDMA base station

Abstract

This paper presents the field trial results of a high temperature superconductor filter system (HTSFS) in a code division multiple access (CDMA) mobile communication base station (BTS) in Tangshan, China.The center frequency of the HTSFS is 830 MHz with 1.4% fractional bandwidth. The noise figure (NF) of the HTSFS, including connectors and cables, is 0.8 dB. The field trial results show that after the HTSFS was installed in the receiver front-end of a CDMA base station, the transmitting power of handset was decreased by 3.1 dB on average. Up to now, the HTSFS has been running steadily in the base station for more than 22 months, demonstrating the reliability and stability of the system. HTS, filter, mobile communication, LNAIn recent years, the rapid growth of the mobile communication in China [1] urges the wireless network operators to do their best to optimize the mobile communication system. The excellent performance of HTSFS can greatly improve the receiving sensitivity and selectivity of the BTS, leading to an increase in the capacity, coverage and ability of anti-interference of the mobile communication network. So the HTSFS has become a competitive resolution for wireless communication companies [2][3][4][5][6] .At present, thousands of HTSFSs are used in wireless communication BTSs in USA. The HTSFSs have proved their advantages over the conventional ones [7] . In this paper, we presented the results of the first field trial of our HTS filters in a CDMA mobile communication BTS of China.

The high temperature superconducting filters and its application progress

“…在中国, 清华大学针对码分多址(code division multiple access, CDMA)通信标准研发了两通道的高 温超导接收机 [95] , 每个通道都包含一个14阶的超导 带通滤波器和低噪声放大器. 该超导接收机首先在 天津的一个CDMA基站进行了试验 [96] , 取得了良好 效果. 然后, 在北京联通公司的5个CDMA基站中都 安置了超导接收机, 建成了超导通信示范小区, 进行 了实际运行(如图9所示).…”

Enabling High-Temperature Superconducting Technologies Toward Practical Applications

“…The Tsinghua University group has designed and fabricated a 14-pole HTS bandpass filter for code-division multiple access (CDMA) communication systems [123]. The HTS filter subsystem is installed in a CDMA base station in urban area of Tianjin as first field trial of the HTS filter subsystem on a single CDMA base station (BTS) [124]. Thereafter, a demonstration wireless communication cluster with HTS filter subsystems was built in the urban area of Beijing [125].…”

A 23 GHz high-temperature superconducting microstrip filter for radio astronomy

“…The microwave related applications of high-temperature superconducting (HTS) technology have been developed rapidly in recent years [1][2][3][4][5][6][7][8] . The research of the HTS filters is of significant importance due to their great performance [9] .…”