Daniel L. Mitten
Mr. Mitten has spent nearly fifteen years providing technical assistance to the Broadband Wireless industry. Over that period, he has been responsible for the design and deployment of several advanced two-way fixed wireless (4G) data systems, the evaluation of additional wireless data platforms and deployment of many conventional systems.
Typical of the RF system designs are the inclusion of antenna or antennas, transmitter, combining filters, duplexers, preselectors, preamplifiers, downconverters, IF amplifiers, modulators and demodulators. Unix based equipment and TCP/IP management system are often used in conjunction with software controlled modulators and demodulators. Embedded software and Windows based control have also been tested and evaluated. Manufacturers included Samsung, Cisco, ADC, Hybrid Networks, Axcera, VYYO, NextNet, Navini, Ceragon, Airspan, SkyPilot, Motorola, Tropos and Sensoria. Transmissions to the subscriber are re-packetized TCP/IP data, and might typically be modulated on 16 or 64 QAM, QAM modulated OFDM carriers or CDMA with modulated bandwidths occupying 2 to 6 MHz. At the physical layer multiple subchannels are combined, such that data payloads are broadcast at 27 Mbps per channel and up. Transmission power levels are normally in the range of 700 watts EIRP when operating in the band from 2500 to 2686 MHz.
Subscriber transmissions are also re-packetized TCP/IP data modulated on 16 or 64 QAM, QPSK, QAM modulated OFDM or CDMA carriers with modulated bandwidths of 160 KHz to 6 MHz and data payloads of 200 Kbps and up. Subscriber modems often include AGC and multiple adaptive equalizer taps to improve multipath performance and digital error correction for low BER performance. The modems transmit data in both the time (TDMA) and or frequency domain (FDMA). DHCP is provided by the modem. Modems using QPSK use proprietary standards and those with higher order QAM on OFDM generally relied on DOCSIS standards. Modem outputs at CATV “T” channels are up converted (2.1 GHz) in an antenna mounted transceiver. Subscriber EIRP is in the range of 5 to 10 watts. The transceiver also provides down conversion from the 2.5 GHz band to CATV channels.
Most systems were designed to replicate ADSL services with data rates available to the customer of 200, 256, 384, or 768 Kbps by T1. Several systems included all. Backbone was provided via fiber and CSU/DSU, OC3 to DS3 conversion, router and microwave link or combinations. Late system deployments efforts use wireless 802.11 standards or proprietary variations of WiFi or WiMax hardware and software technologies, with correspondingly greater payload capacities. Mr. Mitten spent four months over the Winter 2007-2008, in the Lab at Herndon, VA, providing Sprint with technical expertise on their Xohm WiMAX project.
In addition to the physical layer considerations mentioned above, the designs require attention to frequency stability, phase noise, dynamic range and tolerance to multipath propagation. Many designs in the MMDS spectrum, required integration into systems providing multiple channel digital or analog video services.
Mr. Mitten performs site acquisition services, vendor selections, and determines vendor and equipment performance criteria as well as schedules. He assists in defining requirements and interviewing candidates for system construction and operation, supervises and trains client and contractor personnel. He directs client personnel in the creation of system documentation. Consults to the needs of market design, including site location, coverage, frequency reuse, QoS, network planning, and FCC licensing requirements.
He is consulted on sales and marketing efforts by client companies and provides sales assistance and product marketing support.
Mr. Mitten was responsible for the design and deployment of one of the most sophisticated systems ever deployed, an eight sector (4x frequency reuse) two-way fixed wireless Internet system, constructed for Nucentrix Internet Services, in Austin Texas. He was also instrumental in the deployment of their Texoma market system. Prior to his work at Nucentrix, he was responsible for the design and construction of a wireless Internet system in Dallas Texas. Before their acquisitions by WorldCom, he provided technical consulting services to ACS Industries, CAI Wireless Systems and CS Wireless Systems, as well as several MMDS equipment manufacturers. He was a pioneer in GPS correlated signal coverage analysis for the industry and provided designs for CARS links carrying data signals. Extensive field work was related to these projects and programs. (Mr. Mitten was the Director of Field Engineering for 16 months as an employee of CAI Wireless)
During the late 1980′s and early 1990′s, Mr. Mitten held sales and marketing positions including positions as Sales Manager and Director of Marketing. As an Anritsu sales representative he was among the top ten nationally.
Although originally introduced to the Multipoint Distribution Service, on a 1979 project, much of Mr. Mitten’s work has been in the design of receivers and transmitters for ground, airborne and space based electronics for countermeasures, telemetry and military applications. He held test and marketing positions related to RF and microwave semiconductors. And earlier, was involved in CATV and MATV equipment design. He attended Bucks County Community College and Pennsylvania Institute of Technology. Holder of FCC Commercial Radiotelephone License endorsed for Ship Radar. D.B.A. Digital Microwave Consulting, he resides in Hilltown, Pennsylvania. US Citizen.