Sunday, October 26, 2008

ADC Notes Key OFDMA Intellectual Property for LTE, WiMAX

ADC announced that its OFDMA (Orthogonal Frequency-Division Multiple Access) multipoint-to-point technology has been recognized in the upcoming update of "WiMAX/LTE IPR and Market Impact Report" from broadband wireless and WiMAX industry research and analysis firm Maravedis Inc. The Maravedis report also noted Alcatel-Lucent, Nokia, Huawei, AT&T, Nortel and Ericsson as companies with key 4G technologies.

OFDMA technology divides available bandwidth into many orthogonal subcarriers, which can be dynamically allocated to multiple users as needed. This flexibility in bandwidth allocation, along with OFDM's resistance to multipath effects, makes OFDMA the technology of choice for 4G networks trying to push the envelope of bandwidth efficiency.

ADC noted that its effort to break into the broadband data transport market began in the early 1990s, when it launched an a $250 million R&D effort supported by some 200 engineers. The company brought to market synchronized OFDMA, an industry-first synchronized multipoint-to-point system leveraging the advantages of orthogonal frequency division multiplexing with sub-channelization in an upstream channel to achieve dramatic improvements in transmission efficiency. After this period of intense development, ADC successfully built and deployed more than 100,000 OFDMA modems. The U.S. Patent Office has issued more than 40 patents to ADC and dozens of additional applications are pending.

An executive summary of Maravedis' "WiMAX/LTE IPR and Market Impact Report" and ordering information for the 4G report can be viewed by visiting

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