KB:Wireless Module

From Compex Wiki
Revision as of 15:25, 3 July 2018 by Winston (talk | contribs) (Where can I download Windows Driver of Qualcomm Atheros for 11n radio card?)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

This is the knowledge base section for Compex Wireless Modules

Contents

Getting Started

How to make sure 802.11a+n embedded board works at 802.11a protocol?

A wireless module can work at one protocol only at one time. Based on Compex firmware, set wireless profile as a+n in Wifi of Network tab, and set max of data rate as ≦ 54Mbps. Then the wireless module will works in 11a protocol.

Is there a limitation in the frequency step size we can command the radio to?

Channel Spectrum Width are 20 MHz, 20/40 MHz, 20/40/80 MHz (for 802.11ac - 5 GHz only). These channels should apply to all the 802.11ac radio cards.

What is the frequency range covered by the 802.11ac card? What channels can we access with the CompexWRT firmware?

Please refer to the table as in below for No country Code. For India Country Code only, extra 2 channels, which is 169 (5.845GHz) and 173 (5.865GHz).

No Country Code supporting Frequencies
2.4 GHz band 5 GHz band
1 (2.412 GHz) 36 (5.180 GHz)
2 (2.417 GHz) 40 (5.200 GHz)
3 (2.422 GHz) 44 (5.220 GHz)
4 (2.427 GHz) 48 (5.240 GHz)
5 (2.432 GHz) 52 (5.260 GHz)
6 (2.437 GHz) 56 (5.280 GHz)
7 (2.442 GHz) 60 (5.300 GHz)
8 (2.447 GHz) 64 (5.320 GHz)
9 (2.452 GHz) 100 (5.500 GHz)
10 (2.457 GHz) 104 (5.520 GHz)
11 (2.462 GHz) 108 (5.540 GHz)
12 (2.467 GHz) 112 (5.560 GHz)
13 (2.472 GHz) 116 (5.580 GHz)
120 (5.600 GHz)
124 (5.620 GHz)
128 (5.640 GHz)
132 (5.660 GHz)
136 (5.680 GHz)
140 (5.700 GHz)
144 (5.720 GHz)
149 (5.745 GHz)
153 (5.765 GHz)
157 (5.785 GHz)
161 (5.805 GHz)
165 (5.825 GHz)

For more information about channels frequency please visit Wikipedia.

In the provided datasheet of WLE1216V5-23, Rx. sensitivity is obtained for 1 stream, or 2 and 4 streams?

RX sensitivity value is represents for 1 stream. It can not be tested and obtained for 2 and 4 streams.

What is the functional difference between 802.11ac Wave 1 and Wave 2?

  • Supports speeds up from 1.3 Gbps in the 5GHz band
  • Supports multiuser multiple input, multiple output (MU-MIMO)
  • Offers the option of using 160MHz wide channels for greater performance
  • Offers the option of using a fourth spatial stream for greater performance
  • Can run in additional 5GHz bands around the world

What are the new data rates supported with Wave 2?

Wave 2 is a superset of 802.11ac Wave 1. As such, it supports all the data rates of 802.11ac Wave 1. With the addition of support for 160MHz wide channels and the modulation and coding scheme (MCS) rates of 802.11ac, Wave 2 provides new maximum PHY rates based on the number of spatial streams and modulation.

What band and channels will 802.11ac Wave 2 operate on?

In practice, both Waves 1 and 2 apply to the 5GHz band only. The available bandwidth varies around the world, but today it is typically some subset of 5.15 to 5.35 and 5.47 to 5.85GHz. US makes all of this subset available to WLANs (580MHz). 802.11ac continues to enable 20 and 40MHz channels but also adds 80 and 160MHz channels for greater throughput. However, given that 160MHz of relatively unused contiguous spectrum is difficult to find, there is an 80+80MHz mode, which is simply the 160MHz waveform split into two different 80MHz frequency segments, enabling them to be placed more flexibly. Note that 20, 40, and 80MHz are the only mandatory channel bandwidths in 802.11ac.

Technical Support

Where can I download Windows Driver of Qualcomm Atheros for 11n radio card?

It is possible to download 802.11n Wireless Module Windows Driver. However, this has not been tested comprehensively.

Where can I download Windows drivers for Compex 802.11ac radio cards?

Qualcomm Atheros did not release Windows drivers for the Compex 11ac cards (WLE900VX (QCA9880), WLE600VX(QCA9882), WLE600V5-27(QCA9882), WLE900V5-27(QCA9880)) and WLE1216V5-23 (QCA9884).

Does 11ac module able to support Mac OS?

There is no driver for Mac OS, so it is not supported.

Where is calibration data stored in 11ac wireless module?

Calibration data stored in OTP for WLE600VX, WLE600V5-27, WLE900VX and WLE900V5-27. Calibration data stored in EEPROM for WLE1200V5-22 and WLE1200V2-22.

How much is the throughput (Mbit per second) can Compex wireless module achieve?

For a/b/g/n wireless modules, its throughput can achieve up to 300Mbps in theoretically. However in practical circumstances, it can achieve 120Mbps in 3.2km and 100Mbps in 10km.

For a/b/g wireless modules, its throughput can achieve up to 20Mbps (up t0 30Mbps for Superchannel). Noted that bandwidth could be affected by interference in air environment.

In a Point to point throughput test with WPJ344 with 802.11ac wireless radio card, how much is the bitrate it can yields?

Following test data for reference only. WPJ344 3x3 11ac yields 600Mbps; WPJ344 2x2 11ac yields 580Mbps. The test been carried out in zero interference, in 80MHz channel spectrum width.

In Point to point throughput test with WPJ558 with 802.11ac wireless radio card, how much is the bitrate it can yields?

Following test data for reference only. WPJ558 3x3 11ac yields 850Mbps; WPJ344 2x2 11ac yields 650Mbps. The test been carried out in zero interference, in 80MHz channel spectrum width.

Can 802.11 AC wireless module of Compex operate in N or A or AC mode for long distance, say 24km?

For example here, WLE600VX can support maximum 24km of long distance in all 11N, 11A, and 11AC modes.

Can 802.11 N wireless module of Compex operate for long distance, say 60km?

For example here, WLE200 can support maximum 48km in HT20, 24km in HT40 and 12km in HT80. Hence it is not possible to go further distance to 60km.

Does wireless module support the standards 802.11k and r?

Yes. Compex wireless modules do support Radio Resource Measurement and Reporting (IEEE 802.11k) and Fast BSS Transition (IEEE 802.11r).

When operating in non-MIMO standards like IEEE 802.11a/b/g, does the QCA9880 transmit on multiple antennas or only on one antenna?

QCA9880 will transmit on multiple antennas for 11 a/b/g rates. Same for other QCA radio cards e.g. QCA9890 QCA9882, QCA9892, QCA9980, AR9280, AR9283, AR9287, AR9580. All our chips will transmit on multiple antennas, and the signals will have phase difference.

Troubleshooting

Why doesn’t 5825MHz support 40MHz channel data rate?

It is the limitation of 5825 MHz. You can't associate with anything has the data rate higher than 288.9 Mbit/s. The limitation of 5825 MHz, or channel 165, is only up to bit rate of 288.9 Mbit/s, which is 20 MHz. In order to use up to 600 Mbit/s, we need to use 40 MHz bandwidth. Each channel is 20 MHz, combines 2 channels we will have 40Mhz. However, you used channel 165 where this is odd channel. Due to this limitation, channel 165 can have up to bit rate of 288.9 Mbit/s. The below table explain how the channels combine together. In normal case of 149, 153, 157, 161. Each channel can use 20 MHz band width. When channel 149 combines with 153, we can use 40 MHz. When channel 157 combines with 161, we can use 40 MHz. When channel (149+153) combines with (157+161), we can use 80 Mhz. You can use up to 80 Mhz for every channel, because the channels are combined. In the case of 165, this is odd channel, of which can use 20 MHz band width only

Normal channels
Combined bandwidth Channel Frequency Single Channel Bandwidth
40MHz (600 Mbit/s) 157 5785 MHz 20MHz
161 5805 MHz 20MHz
Last odd channel
Combined bandwidth Channel Frequency Single Channel Bandwidth
NA 165 5825 MHz 20MHz