Ernest T. Tsui - Cupertino CA, US Jeffrey C. Harp - Los Altos CA, US
Assignee:
Intel Corporation - Santa Clara CA
International Classification:
H04M 1/00
US Classification:
4555621, 455446, 455561, 4554221
Abstract:
A base station for a wireless communication system has an antenna system that provides a downstream transmit pattern partitioned into azimuthal sectors and an upstream receive pattern partitioned into azimuthal sectors and elevation sectors. The base station has a transmitter connected to the antenna system to transmit a signal to a subscriber using the downstream transmit pattern, and a receiver connected to the antenna system for receiving a signal from the subscriber using the upstream receive pattern.
A first signal containing a noise characteristic such as ingress, a data signal component, and a known sequence of symbols is transmitted from a client to a headend via a transmission channel within a communication network. A model of the transmission channel in the absence of the noise characteristic is then generated, the known sequence of symbols is applied to the transmission channel model, and the output of the transmission channel model is compared to the received signal to dynamically estimate the noise characteristic. The dynamically estimated noise characteristic is then used to modify the signal either at the client or the headend to reduce the impact of the noise characteristic on the transmitted data.
Efficient Qam Equalizer/Demodulator With Non-Integer Sampling
Jeffrey C. Harp - Los Altos CA Lee Snyder - San Jose CA Ernest Tsui - Cupertino CA
Assignee:
Applied Signal Technology, Inc. - Sunnyvale CA
International Classification:
H04L 2738
US Classification:
329306
Abstract:
A QAM demodulator that samples an IF input modulated with data at a fractional complex sampling rate between one and two times the data rate. The use of a fractional sampling rate significantly reduces the number of components necessary to implement the demodulator, particularly in the equalizer section of the demodulator which corrects for channel distortion. The fractional sampling rate demodulator architecture of the invention provides a significant reduction in integrated circuit surface area needed in a VLSI implementation.
Yet, Jeffrey Harp, retired FBI assistant special agent in charge of the San Francisco office, said in a Chronicle interview that there is no way to completely safeguard the Feb. 7 game. He said more than 1 million people are expected to come to the Bay Area for the event.
Paul Bretey (1989-1991), Sue Goodrich (1976-1980), Gerald Johnson (1966-1970), Jeff Harp (1968-1972), Kathy Henderson (1974-1978), Shelly Krebs (1986-1990)