And what has the soon-to-be-IPOd ATT Wireless (12-14 million TDMA subs) been up to regarding 3g WCDMA?
Apparently, if you've been diligently cross-checking Darrell's statements and references regarding the IMT-2000 process, ATT Wireless has been working with Golden Bridge Technology on variations of WCDMA. According to Darrel, one key difference between Qualcomm's narrowband approach in CDMAOne/CDMA2000, which uses a conventional correlator bank-based system, and WCDMA is the use of an unconventional matched filter systems by IDC and GBT who share a common link in Donald L. Schilling and also have a similar approach to IPRs and the 3g Patent Platform.
2-Stage Matched Filter (2-PMF) Technology
Matched filter has been known to offer shorter acquisition time, but was criticized for its size, which limits its applicability in consumer products. GBT's invention of the 2-Stage Matched Filter (2-PMF) architecture is the first receiver structure that makes efficient handling of packet-switch wireless data communication commercially feasible.
Wide-band packet-based systems of any standard pose major challenges in signal acquisition multipath processing, inter-frequency handover implementation, and power consumption. GBT's 2-PMF architecture answers all these challenges and is essential to all developers of WP-CDMA products.
GBT's 2-PMF is applicable for consumer devices because it does not impose impractical requirements with respect to size, power consumption and costs. Its short acquisition time makes efficient handling of packet switched communication feasible. It can also monitor the received signal and rapidly adapt to the changing channel characteristics in a mobile environment. It enables implementation of the smallest, least power consumptive and least expensive consumer products.
gbtwireless.com
On another note, late last year, CDTS generated capacity gains of 80% in a TDMA system. Now, initial CDMA trials are producing dramatic gains. Methinks the acquisition prices of these cowboys have just gone up from yea high to obnoxious since the interest in designing in those filters is going up with every trial.
The testing showed that the ClearSite system can increase cell site coverage area by as much as 50 times (5000%) and can increase capacity by a comparably large amount when strong interfering radio frequency (RF) signals are present
Conductus ClearSite(R) System Dramatically Improves Performance in CDMA Field Trial
First CDMA Trial Results Exceed Predicted Outcome
biz.yahoo.com
Factor in Lucent's BLAST, ArrayCom's smart antenna, and other innovations being produced by the industry targeted at the 400 or so GSM and TDMA carriers in 140 or so countries around the world, and you get a more realistic picture of the 3G IPR situation. |
