wonder how that compares to these claims from Essex corp:
Wednesday June 7, 2:09 pm Eastern Time
Company Press Release
SOURCE: Essex Corporation
Essex Corporation Applies for Fiberoptic and Wireless Patents
COLUMBIA, Md., June 7 /PRNewswire/ -- Essex Corporation (OTC Bulletin Board: ESEX.OB - news) today announced that it has filed applications to secure patent protection for innovative technologies in two communications device families. These are fiberoptic Hyperfine Wave Division Multiplex (HWDM) channelizers and wireless Optimal Code Division Multiple Access Receivers (OCDMAR). The purpose of the HWDM is to increase the number of usable communications channels within a single optical fiber. The purpose of the OCDMAR is to increase capacity and improve voice and data quality of wireless systems.
As previously announced, Essex is building an HWDM proof-of-concept demonstration under the terms of a $350,000 U.S. government contract. The Company believes that it is possible to produce HWDM devices capable of providing more than 1000 channels in a single optical fiber. The possible applications of such devices include enabling more dense utilization of optical fiber capacity in ``last mile'' connections to small business and personal users. Essex engineers also believe that a related HWDM device can be used to reduce the number of signal regenerators required in long-haul lines.
Code Division Multiple Access (CDMA) uses code diversity to separate multiple users within a limited range. Such inefficiencies within this process as the ``near-far'' problem limit practical implementation of CDMA systems well below their theoretical capacities. The OCDMAR is designed to achieve wireless performance approaching signal to noise (CNR) rather than signal to interference (CNI). Two Essex optical devices may provide critical enabling components for an optimal CDMA receiver. One, for use in a cellular CDMA handset, is a small, low-power chipset that can facilitate cancellation of all interferers and the summation of all multipath copies of the desired signal. That device would operate at CDMA chip rates from 10 kHz to 30 MHz. The other somewhat larger device performs the same functions at CDMA chip rates of 5 MHz to 2 GHz. Applications of that device to wireless local area networks (WLAN), including last-mile fiberoptic signal distribution, can be an enabler of the Web-Without-Wires. Company development of its OCDMA devices is limited pending establishment of an industrial partnership.
Harry Letaw, Chairman and CEO, stated, ``Consistent with our intention to capitalize upon these inventions, we are expanding our provisional applications and perfecting the protection of this intellectual property. This new field of interest is a welcome addition to our continuing activities in applying optoelectronics to solve problems in radar, MRI, laser and acoustic imaging and defense radar systems.''
Essex Corporation is a publicly traded company that develops and produces high-speed optoelectronic processors for imaging, signal processing and communications systems, and supplies advanced processing and communications engineering for government and private industry. Additional information is available on our Web site at www.essexcorp.com , or by calling 800-53ESSEX.
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Also, I tend not to agree with that poster's comment: "it seems to me that these new ideas, when incorporated into CDMA , will make the CDMA approach absolutely unassailable."
since this potentially increases the number of simultaneous users, not the bandwidth PER USER. I also find the factor of 3 or 4 claims hard to believe. Not to mention that in just about every major wireless market, the consumer has choices of CDMA 1900, TDMA 1900, GSM 1900, CDMA 800, TDMA 800, iDEN, from a number of different providers. User Capacity per cell is not something a consumer knows or cares about when selecting a service. Also, it's not something that can be justifiably added to every base station. Seems it would be added on a case by case basis, only when there are lots of dropped calls. |
