RF802.16 Standard Comparison: a, d, and e Versions
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This page provides a comparison between the different versions of the 802.16 standard, specifically 802.16, 802.16a, 802.16d, and 802.16e. We’ll explore the key differences in their specifications and capabilities.
Specifications Comparison
Here’s a breakdown of the key differences in a table format:
| Specifications | 802.16 | 802.16a | 802.16d | 802.16e |
|---|---|---|---|---|
| Frequency of operation | 10 to 66 GHz | 2 to 11 GHz | Less than 6 GHz | Less than 6 GHz |
| Mode of operation | LOS (Line of Sight) | Non LOS (Non-Line of Sight) | Non LOS | Non LOS |
| Data rate | 32 to 134 Mbps (28 MHz BW channel) | Less than 70 or 100 Mbps (20 MHz BW channel) | Upto 70 Mbps with no mobility | 60-70 Mbps with mobility |
| Mobility | fixed | fixed | fixed | less than and equal to 75 Miles/Hour |
| Modulation | QPSK, 16QAM, 64QAM | 256point FFT with QPSK, 16QAM, 64QAM, 256QAM | same as 16a | same as 16a with OFDMA modulation scheme with variable FFT sizes |
| Cell radius | 1 to 3 miles | 3 to 5 miles | 3 to 5 miles | 1 to 3 miles |
| Channel Bandwidth | 20/25/28 MHz selectable | 1.25 to 20 MHz | 3.5 MHz, 7 MHz | 1.25 to 28 MHz , OFDMA modulation scheme |
Key Takeaways
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802.16: The original standard, designed for fixed wireless access with line-of-sight requirements and higher frequency bands.
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802.16a: An enhancement to support non-line-of-sight operation by using lower frequencies. It allowed for greater flexibility in deployment.
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802.16d: An evolution building upon 802.16a, primarily focusing on fixed wireless applications but with improvements in features and capabilities.
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802.16e: The key version that introduced mobility. This allowed users to maintain connectivity while moving, which was a major advancement and a defining characteristic of Mobile WiMAX. It uses OFDMA for improved performance and scalability.
