Performance of network-coding-assisted scheduling schemes and their applications in uplink time division duplexing code division multiple access systems

2011 ◽  
Vol 5 (17) ◽  
pp. 2558-2568
Author(s):  
X. Zhang ◽  
H.-H. Chen ◽  
Z. Ding ◽  
K.K. Leung ◽  
M. Peng ◽  
...  
Keyword(s):  
Network Coding ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Code Division Multiple ◽  
Time Division ◽  
Time Division Duplexing

The Design and Application of UAV’s Digital Steering Gear

2011 ◽  
Vol 181-182 ◽  
pp. 998-1005
Author(s):  
Shi Jun Xu ◽  
Yong Hong Hu ◽  
Wei Wan
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Computer Control ◽  
Normal Operation ◽  
Electromagnetic Environment ◽  
Aerial Vehicle ◽  
Working Principle ◽  
Environmental Requirements ◽  
Code Division Multiple ◽  
Time Division

For a special electromagnetic environment and the installation of environmental requirements of UAV (unmanned aerial vehicle) airborne, a design of digital anti-jamming steering gear is given. The composition, functions and working principle of the steering gear are described in details. The key circuits of functional modules are given, introduce a CDMA (code division multiple access) communication protocol of Digital Servo instruction and TDMA (time division multiple access) state data frame format. Take a UAV as an example, discusses the multi-steering application in airborne systems workflow. The application results showed that: this design not only improves the steering anti-jamming capability, ensures that the steering gear in the normal operation of complex electromagnetic environment, but also greatly reduces the UAV onboard computer control interfaces, improves flexibility and reliability.

Determination of Number of Channels in Multiple Access Techniques for Wireless Communications

2015 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Venkata Raghavendra Miriampally ◽  
G. Subba Rao ◽  
V Sudheer Raja
Keyword(s):  
Wireless Communications ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Radio Spectrum ◽  
Base Station ◽  
Available Bandwidth ◽  
Code Division Multiple ◽  
Time Division ◽  
Communications System

<p>In wireless communications system, it is desirable to allow the subscriber to send simultaneously information to the base station while receiving information from base station. Multiple access techniques are used to allow many mobile users to share simultaneously a finite amount of radio spectrum. Frequency division multiple access (FDMA), time division multiple access(TDMA), and code division multiple access (CDMA) are the three major access techniques used to share the available bandwidth in a wireless communication system. In this paper we calculated the number of channels required for FDMA &amp; TDMA techniques depending on various factors such as spectrum, channel band width etc.</p>

scholarly journals Theoretical Investigation into Spectral Coexistence of CDMA and TDMA Systems

2008 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
A.M. Abbosh ◽  
M. A. Shehathah
Keyword(s):  
Theoretical Investigation ◽  
Spectral Efficiency ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Radio Spectrum ◽  
Considerable Improvement ◽  
Multimedia Systems ◽  
Cdma System ◽  
Code Division Multiple ◽  
Time Division

 The scarcity of available radio spectrum presently limits the extension of modern multimedia systems. This paper presents a theoretical investigation into the possibility of using a frequency overlay of a narrowband Code Division Multiple Access (CDMA) System and a Time Division Multiple Access (TDMA) System to provide a greater spectral efficiency. This paper shows that under certain conditions the two systems can operate in the same frequency band and in the same area with a considerable improvement in the overall capacity of the whole system. 

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