Radiospire with its AirHook UWB chipset has demonstrated the highest airlink throughput in the UWB industry of about 1.6 Gbps. The top device in our recent EE Times test, Pulse-LINK's CWave, performed at 675 Mbps PHY data rate and delivered approximately 500 Mbps TCP throughput.
WiMedia devices, comprising most of the UWB market, reached only around 50 Mbps application layer throughput. We were unable to verify whether the WiMedia PHY data rate reached the advertised 480 Mbps.
The WiMedia vendors claim that the low throughput is due to early driver implementations. The top performing new generation WiMedia chipset from Alereon is expected to reach 160 Mbps, but this is still an order of magnitude lower than Radiospire's 1.6 Gbps.
octoScope has verified the 1.6 Gbps performance of the Radiospire AirHook chipset both on the bench and working as an HDMI cable replacement. The airlink transport of uncompressed 1080p HD video and 8 channel audio worked at 15 feet of range, through obstructions and at any antenna orientation.
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Figure 1: Testing verified studio grade performance of the Radiospire wireless UWB based HDMI cable replacement reference design.
The data converters worked at 1.92 Giga samples per second with 5.5 bit effective resolution. The Radiospire device handled 1.7 GHz of bandwidth from 3.1 to 4.8 GHz, per design.
The system test setup included two displays placed side by side for a visual comparison of signal quality on the airlink vs. the ideal cabled signal. One of the displays was connected to the video source through an HDMI cable and the other display was connected through the AirHook airlink (Figure 2).
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Figure 2: Radiospire system test setupTwo displays side by side with one connected through an HDMI cable and the other via the Radiospire UWB link. The Radiient repeater was used to split the HDMI signal into two identical synchronized streams.
The airlink delivered approximately 1.6 Gbps at all antenna and device orientations and with humans and furniture blocking the beam. The display quality on the wired and wireless HDMI links were indistinguishable to the naked eye under all test conditions (Figure 3). The audio on both displays was synchronized with no perceptible delay indicating low latency on the UWB link.
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Figure 3: Comparison of the video quality between the wired and wireless links revealed no visible differences under any of the test conditions, for any antenna orientation and with obstructions in the beam.
The video quality was tested with 2.4 GHz Wi-Fi interference (streaming video from a website to a laptop) right next to the Radiospire device and with 900 MHz interference from a nearby baby monitor. We have observed no degradation in video quality due to this interference.
We also verified the transmit power at the antenna port of the transmitter for FCC compliance (Figure 4). This was intended to be an informal verification.
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Figure 4: Informal FCC compliance verificationConducted spectrum measurement at the antenna port of the transmitter. The average power at the antenna port is below -40 dBm/MHz and with some isotropic losses through the antenna meets the FCC limit.
Tables 2 and 3 summarize the tests we have performed and the test results.
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Table 2: Benchtop verification of the AirHook chipset.
Click here for Table 3.
Table 3: System verification of the Radiospire AirHook chipset.