Wireless Networking: Spread Spectrum, Radio Systems, and Components

This report provides an overview of spread spectrum techniques used in wireless communication, where the transmitted signal's frequency is deliberately varied to create a larger bandwidth. It discusses three primary spread spectrum methods: FDMA, TDMA, and CDMA. Additionally, the report outlines various components of a radio system, including filters, power amplifiers, antenna tuning units, and power suppliers, essential for platform installation. Different types of mixers are also explored, such as active, harmonic, switching, diode, and passive mixers, categorized by their topology into unbalanced, single balanced, and double balanced mixers. The report concludes with a list of references used for further research and understanding of these concepts.

WIRLESS NETWORKING
CONCEPTS

SPREAD SPECTRUM
• Spread spectrum refers to the form of wireless communication
where the transmitted signal’s frequency is varied deliberately,
which ultimately results in the formation of a bandwidth which
is much greater than the bandwidth which the signal would be
having when the frequency was not varied
• The signal transmitted occupies a much higher bandwidth than
the systems which are used in the conventional modulation
methods.
• The spreading of the band is achieved my selecting waveforms
of appropriate bandwidth which generally consists of waveforms
with wide bandwidth.

Different methods of Spread
Spectrum
There exists three different methods of spread spectrum and this includes the
following:
• FDMA or Frequency Division Multiple access
• TDMA or Time Division Multiple Access
• CDMA or Code Division Multiple Access.

Components of a Radio System
Different types of radio components are available for appropriate
platform installation. The different components of a radio spectrum are
listed below:
• Filter and Multi-coupler
• Power amplifiers
• Antenna tuning units
• Remote control units
• Power suppliers
• Audio units
• System racks

Types of Mixers
There exists different types of mixers and they are listed below:
• Active Mixers
• harmonic mixer
• subharmonic mixer
• Switching mixers
• Diode mixers
• Passive Mixers

Mixers according to their
Topology:According to the topology mixers can be classified into three
types and this mainly includes the following:
• Unbalance mixers
• Single balanced mixers
• Double balanced mixer

References:
• Hotokezaka, K., & Piran, T. (2015). Mass ejection from neutron star mergers: different components and
expected radio signals. Monthly Notices of the Royal Astronomical Society, 450(2), 1430-1440.
• Kaddoum, G., Richardson, F. D., & Gagnon, F. (2013). Design and analysis of a multi-carrier
differential chaos shift keying communication system. IEEE Transactions on Communications, 61(8),
3281-3291.
• Lin, F., Mak, P. I., & Martins, R. (2014, February). 3.9 An RF-to-BB current-reuse wideband receiver
with parallel N-path active/passive mixers and a single-MOS pole-zero LPF. In Solid-State Circuits
Conference Digest of Technical Papers (ISSCC), 2014 IEEE International (pp. 74-75). IEEE.
• Myslivets, E., Kuo, B. P., Alic, N., & Radic, S. (2012). Generation of wideband frequency combs by
continuous-wave seeding of multistage mixers with synthesized dispersion. Optics express, 20(3),
3331-3344.
• Rappaport, T. S., Sun, S., Mayzus, R., Zhao, H., Azar, Y., Wang, K., ... & Gutierrez, F. (2013).
Millimeter wave mobile communications for 5G cellular: It will work!. IEEE access, 1, 335-349.
• Sadegh Amiri, I., Nikmaram, M., Shahidinejad, A., & Ali, J. (2013). Generation of potential wells used
for quantum codes transmission via a TDMA network communication system. Security and
Communication Networks, 6(11), 1301-1309.
• Sha, X. J., Qiu, X., & Mei, L. (2012). Hybrid carrier CDMA communication system based on weighted-
type fractional Fourier transform. IEEE Communications Letters, 16(4), 432-435.
• Torrieri, D. (2015). Principles of spread-spectrum communication systems. Springer.