TEDS: A high speed digital mobile communication air interface for professional users

2006 ◽  
Vol 1 (4) ◽  
pp. 32-42 ◽  
Author(s):  
Mehdi Nouri ◽  
Vincenzo Lottici ◽  
Ruggero Reggiannini ◽  
Diana Ball ◽  
Mark Rayne
Keyword(s):  
Mobile Communication ◽  
High Speed ◽  
Air Interface

scholarly journals Investigation of sub-carrier multiplexed fiber optic link supporting WLAN and WCDMA

2021 ◽  
Author(s):  
Roland M. C. Yuen
Keyword(s):  
Access Control ◽  
Medium Access Control ◽  
Mobile Communication ◽  
Fiber Optic ◽  
Multipath Fading ◽  
Numerical Results ◽  
Optical Noise ◽  
Medium Access ◽  
Air Interface ◽  
Nonlinear Distortions

In this thesis, an optical fiber based radio access architecture that simultaneously provides services of the wireless local area network (WLAN) and the third generation (3G) mobile communication system is investigated. The sub-carrier multiplexed (SCM) technique of the fiber optic system is considered. The SCM architecture does not require frequency conversion and plays an important role enabling the WLAN to complement the cellular mobile communication systems so that the user can have both services as needed. In the SCM architecture, the two mediums that signals propagate are the air interface and the radio over fiber (ROF) link. In the air interface, the signal experience path loss and multipath fading that have effect on the system performance. The ROF link introduces nonlinear distortions and optical noise. The uplink and downlink analysis are performed in this thesis considering all the impairments from the air interface and the ROF link. Thereafter, numerical results are generated for both the uplink and downlink to illustrate the performance of the SCM architecture. The analysis identifies the interdependent relationship of the WLAN and the WCDMA system. The numerical results graphically illustrate such interdependent relationship. In the downlink, a 5 km ROF link operating at optimal power can support a WCDMA system with 1 km radius of coverage that has 26 dB of signal to distortion and noise ratio (SDNR); and a WLAN system with 400 m radius of coverage that has 27 dB of SDNR. The throughput of IEEE 802.11 WLAN depends on the medium access control. Hence, the medium access control is investigated and the throughput expression is modified to adapt to the SCM architecture where signals travel extra distance in a fiber.

Train-mounted Broadband Monopole Antenna for 5G Communication

2021 ◽  
Vol 36 (7) ◽  
pp. 879-884
Author(s):  
Hao Li ◽  
Lu Xu ◽  
Feng Qian ◽  
Yong Zhou
Keyword(s):  
Mobile Communication ◽  
Communication Systems ◽  
High Speed ◽  
High Gain ◽  
Monopole Antenna ◽  
Mobile Terminals ◽  
High Speed Railway ◽  
Public Transport System ◽  
Fifth Generation ◽  
5G Mobile Communication

As a convenient and efficient public transport system, high speed railway (HSR) was rapidly deployed in China. Since the fifth generation (5G) mobile communication system is commercially applied, it is necessary for mobile terminals antennas to cover multiple operating bands to be compatible with various communication systems. Here a HSR-mounted broadband and high-gain monopole antenna is proposed. By using the meander technology and introducing the tapered structure, the proposed antenna operates over a bandwidth of 694-960 MHz and 1350-5975 MHz (VSWR<1.8), which covers both 2G-5G mobile communication and WiFi frequency bands. The dimensions of the proposed antenna are 400 mm × 330 mm × 78 mm. The measured average gain is 6.11 dBi over the entire bandwidth.

Design and Fabrication of a High Frequency Thin Film Resonator Using Low Acoustic Impedance Reflective Layer

2003 ◽  
Author(s):  
Chung-Hsien Lin ◽  
Hong-Ren Chen ◽  
Chen-Hsun Du ◽  
Weileun Fang
Keyword(s):  
Thin Film ◽  
Mobile Communication ◽  
Acoustic Impedance ◽  
Piezoelectric Layer ◽  
Acoustic Waves ◽  
High Frequency ◽  
The Novel ◽  
Novel Device ◽  
Reflective Layer ◽  
Air Interface

A high frequency thin film resonator using single reflective layer is presented. The reflective layer is chosen to have a low acoustic impedance to reflect acoustic waves, which is generated by the piezoelectric layer above it. With an air interface serves as a free boundary at the other end of piezoelectric layer, a high frequency resonator can be formed. Since the fabrication process included no bulk etching and multi-layer, a high manufacturability can be achieved. Moreover, the novel device and its applications can be designed to be suit many mobile communication applications.

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