HBFDD-B High-Power Bidirectional Broadband System

Overview

The HBFDD-B is a high-power FDD frequency-division duplex bidirectional broadband transmission system purpose-built for long-range field communications. It delivers up to 40 W of RF output power — eight times that of the HBFDD-A — providing wireless coverage over dramatically larger areas. The system is housed in a 2U rack-mount chassis (485 x 340 x 90 mm, 4.5 kg) with AC 220V or DC 28V power options, designed for vehicle, shipboard, or fixed-site installation.

Operating in the 300-900 MHz band with adjustable channel bandwidth from 1 to 8 MHz, the HBFDD-B maintains the same core FDD advantages as its lower-power counterpart — superior interference rejection, stable full-duplex throughput, and strong NLOS propagation — while extending range to 5-20 km in urban NLOS conditions and 20-40 km in open LOS environments. Data rates reach 2-25 Mbps with an 80 ms system delay.

Key Features

• 40 W high-power output provides the widest wireless coverage in the HBFDD series, configurable from 10 to 40 W via the onboard LCD panel
• FDD frequency-division duplex ensures continuous full-duplex operation with no time-slot contention, delivering stable throughput even under strong electromagnetic interference
• Long-range NLOS and LOS performance bridges communication gaps across cities, coastlines, and open terrain — 5-20 km urban NLOS and 20-40 km line-of-sight
• Modular 2U rack design with LCD parameter display, signal strength indication, and 256-bit AES dynamic encryption for secure theater-level operations
• Vehicle, shipboard, and fixed deployment with omnidirectional antennas and plug-and-play setup requiring no angular alignment

Technical Highlights

The HBFDD-B's FDD architecture uses paired symmetric frequency channels with guard band isolation, eliminating the adjacent-frequency interference vulnerability inherent in TDD systems. The adaptive bandwidth control (1/2/3/4/5/6/7/8 MHz) allows operators to optimize for range or throughput per mission. The system supports both symmetric and asymmetric bandwidth modes. When frequency-selective fading occurs due to multipath transmission, only the subcarriers within the notch are affected — the rest of the channel continues operating normally. Full-duplex RS-232 serial data at up to 115200 bps runs alongside standard 10/100Base-T Ethernet, and the dual N-type RF interfaces accommodate external high-gain antennas for extended reach.

Applications

The HBFDD-B is designed for vehicle-to-vehicle, vehicle-to-command-center, and ship-to-shore communication links. Typical deployments include public security task forces, fire rescue command vehicles, power and railway emergency response, maritime patrol and law enforcement, border security, military battlefield communication, and large-scale event security. In smart city infrastructure, it serves as a backhaul link between remote monitoring sites and centralized control. In disaster response, its 40 W output ensures communication continuity when cellular infrastructure is compromised.

Why Choose This System

The HBFDD-B fills the gap between portable soldier radios and fixed satellite or fiber links. Its 40 W FDD architecture delivers reliable bidirectional broadband at distances no manpack system can match, while the 2U rack format integrates cleanly into existing vehicle and shelter installations. For operations that demand theater-scale coverage with full-duplex throughput, the HBFDD-B is the most capable FDD solution in its class.