Wireless performance is often described using a handful of technical specifications—TX power, RX sensitivity, out of band suppression, EVM, interference desensitization, frequency diversity, and more. But what do these parameters really mean, and how do they translate into the practical user experience of range vs. throughput?
In Vizmonet’s radio platforms, these performance indicators are not independent. They work together to determine how far a link can reach, how stable it is under interference, how much data it carries, and how well it performs in real world deployments.
This blog demystifies these core RF metrics and explains how Vizmonet’s engineering approach delivers a balanced and robust wireless experience.
1. Transmit Power (TX Power): The Foundation of Link Budget
TX Power represents the strength of the signal transmitted over the air. Higher TX power improves the ability of the signal to travel through long distances or obstacles.
Why TX Power Matters
- Enhances range, especially in non line of sight or dense urban environments.
- Improves link reliability during fading or atmospheric losses.
- Provides better downlink robustness in noisy environments.
Vizmonet’s Design Philosophy
While cranking TX power to the maximum seems ideal, it can increase distortion and degrade spectral purity. Vizmonet radios use:
- Linearized PA stages
- Thermally optimized power control
- Precision calibration of every card to account for component-level tolerances
This ensures high TX power is delivered cleanly, without compromising adjacent channels or EVM.
Most Vizmonet radios deliver up to 30 dBm total output for BPSK and QPSK, with output power backed off to around 21 dBm for 1024-QAM to maintain sufficient headroom for the stringent EVM requirements of higher-order MCS rates.
2. Receiver Sensitivity (RX Sensitivity): Listening for the Faintest Signals
RX Sensitivity indicates how weak a signal the receiver can decode reliably. It’s affected by:
- Noise figure of the radio
- Channel bandwidth
- Modulation and coding scheme (MCS)
- Digital signal processing accuracy
Why It Matters
Better RX sensitivity directly drives:
- Longer range (since faint signals are still usable)
- Stable links in low SINR conditions
- Improved uplink performance, usually the weaker side of a link
Vizmonet radios employ advanced low noise amplification and filtering to achieve top tier RX sensitivity, ensuring stable performance even at the cell edge.
3. Out of Band (OOB) Suppression: Keeping Your Spectrum Clean
In dense or regulated spectrum environments, radios must ensure minimal leakage outside their allocated frequency band.
Benefits of Strong OOB Suppression
- Prevents interference to neighbouring bands
- Enables denser frequency reuse
- Ensures compliance with regulatory masks
- Improves coexistence with other technologies
Vizmonet’s RF frontend uses carefully engineered filters and linear signal chains to deliver high OOB suppression without sacrificing in band performance.
4. Interference Desensitization: Real World Resilience
In real deployments, interference is not optional—it’s guaranteed.
Interference desensitization measures how much a receiver’s sensitivity degrades when strong signals or noise sources are nearby.
High Performance Here Means
- Better operation in congested urban or industrial environments
- Stable uplink even when co located LTE, 5G, or WiFi transmitters are active
- Higher sustained throughput under fluctuating interference
Vizmonet radios mitigate desensitization through:
- Robust filtering
- High dynamic range ADCs
- Interference aware digital processing
Here are the snapshots of typical interference desensitization performance metrics of Vizmonet products.
4. Error Vector Magnitude (EVM): The True Indicator of Modulation Quality
EVM measures the accuracy of transmitted constellation points by quantifying deviations from their ideal positions. It reflects factors such as linearity, phase noise, and other RF impairments. Lower EVM indicates higher modulation fidelity, enabling higher-order schemes like 256 QAM or 1024 QAM, which significantly boost throughput.
Why EVM is Important
- Directly affects maximum throughput
- Determines the MCS rates the radio can sustain
- Influences performance in high interference situations
Vizmonet radios optimize all stages—PLL phase noise, DAC linearity, PA distortion, and DSP correction—to achieve excellent EVM even at high TX power.
Here are the snapshots of typical EVM performance metrics of Vizmonet products.
6. Frequency Diversity: Fighting Fading with Smarter Spectrum Use
Wireless channels can suffer from:
- Multipath fading
- Atmospheric disturbances
- Seasonal and weather based propagation changes
Frequency diversity allows Vizmonet radios to maintain reliability by:
- Supporting flexible carrier selection
- Offering wideband and narrowband operation
- Allowing adaptive channel switching in real time
The result is a link that remains stable—even when a particular part of the spectrum becomes unreliable.
Vizmonet’s radio line-up supports a broad frequency spectrum, from 900 MHz through 2.4 GHz, 4.9 GHz, and 5 GHz, enabling flexibility across multiple deployment scenarios and applications.
How These Metrics Work Together: The Range vs Throughput Balancing Act
Every radio must navigate a trade off between maximum range and maximum throughput.
To Achieve Long Range, You Need
- High TX power (clean)
- Excellent RX sensitivity
- Good frequency diversity
- High interference immunity
To Achieve High Throughput, You Need
- Low EVM (supports higher MCS)
- Low interference desensitization
- Strong OOB suppression (enables high-quality spectrum use)
Vizmonet’s Balanced Approach
Instead of optimizing only one aspect, Vizmonet radios deliver:
- High linear TX power for range
- Industry leading EVM for throughput
- Strong OOB suppression for dense deployments
- Robust RX sensitivity for edge performance
- Superior interference handling for real world environments
The result is a radio platform that provides:
- Longer stable links
- Consistently higher MCS levels
- Better spectral efficiency
- Stronger performance under interference
Ultimately, this translates to the best blend of range and throughput—not just in controlled lab tests, but in real world deployments where it truly counts.
The plot below illustrates Vizmonet’s performance advantage over competitors, based on conducted TCP/IP throughput measurements across varying attenuation levels between the transmitter and receiver.
Conclusion
Vizmonet’s radio performance is not defined by a single metric but by a coordinated engineering approach across RF, filtering, baseband, and DSP domains.
By excelling in TX power, RX sensitivity, OOB suppression, EVM, interference management, and frequency diversity, Vizmonet radios stand out as a balanced and high-performance platform that thrives in modern spectrum environments.