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COFDM Classification in Wireless Transmission

COFDM (Кадаванае мультыплексіраванне з артаганальным частотным падзелам) is one of the most reliable transmission technologies for UAVs, беспілотныя транспартныя сродкі, and wearable systems. Its strong anti-multipath capability, support for NLOS (без прамой бачнасці) перадача, and adaptability across wide frequency ranges make it a cornerstone in бесправадное відэа, аўдыё, і спасылкі перадачы дадзеных.

У бесправадной перадачы БЛА, COFDM systems can be classified according to several standards:

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1. By Device Type

• COFDM перадатчыкі

  • Devices dedicated to sending video, аўдыё, and data streams.

  • Typical use: UAV airborne modules, body-worn transmitters, vehicle-mounted transmitters.

• COFDM Receivers

  • Devices for decoding and outputting signals (HDMI, CVBS, IP, or recording).

  • Common in ground stations, мабільныя камандныя цэнтры, or monitoring systems.

• COFDM Transceivers

  • Забяспечыць двухбаковая сувязь: спасылка на відэа + telemetry or control uplink.

  • Essential for advanced UAV applications requiring integrated command and monitoring.

  • The uplink and downlink can be set to different operating frequencies.

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2. By Transmission Direction

• Unidirectional COFDM

  • One-way transmission, напр., video from UAV to ground.

  • Lower complexity and cost, often used for FPV video or broadcast.

• Bidirectional COFDM

  • Two-way link supporting both спасылка на відэа і telemetry/control uplink.

  • Enables full integration of video, flight data, and control feedback in one system.

• Unidirectional Video and Bidirectional Data

  • One-way video transmission and two-way data transmission, mainly used for ground robots and remote control vehicles.

• COFDM Relay / Repeater between Transmitter and Receiver

  • A COFDM relay receives, amplifies, and retransmits the signal between the transmitter and receiver to enhance its strength and coverage.

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3. By Transmission Content

• COFDM Video Transmitters

  • Focused on sending live video from UAV cameras.

• Відэа COFDM + Telemetry Data Transmitters

  • Combine Відэа ў рэжыме рэальнага часу з GPS, датчык, and flight control data.

  • Common in surveillance drones, inspection UAVs, і абаронныя заяўкі.

• COFDM Audio Transmitters

  • Прызначаны для галасавая сувязь or audio-only streams.

  • Can be used standalone or in parallel with video systems.

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4. By Signal Input Interface

• HDMI Input COFDM Transmitters

  • Connect directly to HD/4K cameras with HDMI output.

• SDI Input COFDM Transmitters

  • Прафесійны клас, які падтрымлівае HD-SDI/3G-SDI cameras for broadcast and cinema drones.

• CVBS Input COFDM Transmitters

  • Legacy analog video interface (Аб).

  • Used in cost-sensitive or backward-compatible UAV systems.

• AHD Input COFDM Transmitters

  • Сумяшчальны з Аналага высокай выразнасці камеры (720p/1080p).

  • Often used in security and industrial UAV setups.

• сетка (IP) Input COFDM Transmitters

  • Accept IP streams from network cameras or encoders.

  • Flexible for UAVs carrying thermal imagers, AI vision modules, or IP PTZ cameras.

• Audio Input COFDM Transmitters

  • Dedicated for microphone/line-in sources for real-time voice communication.

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5. By Frequency Band

• Low-to-Mid Band COFDM (170–860 МГц)

  • Strong penetration and long-distance coverage.

  • Useful for NLOS UAV operations in urban or forest environments.

• High Band COFDM (860 MHz–6 GHz)

  • Higher bandwidth for HD/4K video.

  • Патрабуецца frequency down-converters for cofdm video receiver.

  • Common ranges: 1.2 Ггц, 2.4 Ггц, 3.3Ггц, 5.8 Ггц.

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6. By Form Factor / Жыллё

• Mount Metal box – CNC customize, 1U or 2U chassis for ground stations or integrated command centers.

• Module-Only – customers provide their own enclosure, ПА, and cooling solutions.

7. Параметры налады

• ПА (ўзмацняльнік магутнасці) – built-in or external
• How many watts of amplifier – 1-watts, 2-Вт, 5-Вт, 10-Вт, 20-Вт, 50-Вт

• фільтр – low-pass, band-pass, or custom filters; can be applied to transmitters, прымачы, альбо абодва.

• Тып корпуса – 1U, 2U rack, or custom housings for UAV/vehicle/wearable integration

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8. By Deployment Platform

• UAV-Mounted COFDM Transmitters

  • Кампактны, Новы бесправадной відэаперадатчык COFDM HDMI CVBS уваход міні-модулятар модуль міжгародняга FPV БПЛА, optimized for airborne use.

  • Асноўныя асаблівасці: нізкае энергаспажыванне, vibration resistance, Эфектыўнае астуджэнне.

• UGV-Mounted COFDM Transmitters

  • Installed on unmanned ground vehicles or robots.

  • Focus on long endurance and high-penetration communication.

• Body-Worn COFDM Transmitters

  • Designed for soldiers, journalists, or rescue teams.

  • Provide live video/audio streaming while being mobile.

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Сціслы пераказ

COFDM in UAV wireless transmission can be classified by:

• Device type (перадатчык, прыёмнік, transceiver),

• Накіраванасць (one-way vs. двухбаковы),

• Transmission content (video only, відэа + тэлеметрыя, audio only),

• Input type (HDMI, SDI, CVBS, AHD, IP, аўдыё),

• Дыяпазон частот (170–860 MHz vs. 860 MHz–6 GHz),

• Параметры налады ( ўзмацняльнік магутнасці, фільтр, Enclose Type),

• Deployment platform (БЛА, УГВ, нацельны).

This layered classification makes COFDM highly adaptable across industries: UAV aerial surveillance, вяшчанне, абароны, рэагаванне на надзвычайныя сітуацыі, робататэхніка, and wearable communication systems.