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While cellular and WLAN (Wireless Local Area Networks) at low frequencies (1-5 GHz) constantly struggle with the quasi-saturation of spectrum, the EHF band (30-300 GHz) has huge swathes of band available at no cost. The recently allocated 71-76 GHz and 81-86 GHz bands provide an opportunity for Line Of Sight (LOS) links for directional point-to-point ”last mile” links. This work focuses on the design...
There has been considerable research into the performance of the enhanced IEEE 802.11e standard in recent years. Majority of the performance analysis has been based on simulations and analytical models, with little testing done in a real-world environment. We investigate the behaviors of the enhanced distributed channel access (EDCA) and legacy distributed coordination function (DCF) based on a testbed...
Although a number of investigations have been conducted using IEEE 802.11e enabled networks to stream class differentiated video, very few reports are available based on a real testbed. In our work, we set up a wireless testbed for H.264 video streaming through assigning the partitioned video packets onto the DCF MAC layer and different access classes of the EDCA MAC layer. We investigate three assignment...
We describe the design of a fifth order opamp-RC filter in a 65 nm digital CMOS process. Designed for a WLAN receiver chain, the baseband filter has a bandwidth of 9 MHz and features extensive use of digital hardware to correct for analog imperfections and thereby relaxing area and power requirements. Measurements show a 24 dB adjacent channel attenuation and an out-of-band IIP3 of 33 dBm. The complete...
We investigate the performance of IEEE 802.11e enhanced distributed channel access (EDCA) using real world hardware in a realistic indoor working environment. TCP streams of different priorities representing traffic types, such as FTP are tested over a wireless network test-bed. Quality of service (QoS) metrics such as throughput and delay are calculated directly from a passive capture of the channel...
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