公开(公告)号：CA2520208A1

公开(公告)日：2004-11-04

申请号：CA2520208

申请日：2004-03-16

Applicant: INTERDIGITAL TECH CORP

Inventor： GRIECO DONALD M ,  YANG RUI ,  KAZAKEVICH LEONID

IPC: H04B17/40 ,  H03G3/30 ,  H04L5/14 ,  H04B17/02

Abstract: In a time-division duplex (TDD) system, a reliable initialization scheme tha t is applicable to an automatic gain controller (AGC) at a base station is implemented in various forms depending on the availability of certain information such as signal-to-interference ratio (SIR), spreading factors an d other parameters. A more accurate estimation of the initial control word of a gain-adjustable amplifier for one or more time slots is implemented. The scheme is applicable to AGC initialization for each time slot of the TDD system, but is also applicable to other systems of transmission, without limitation.

公开(公告)号：AR037191A1

公开(公告)日：2004-10-27

申请号：ARP020104175

申请日：2002-11-01

Applicant: INTERDIGITAL TECH CORP

Inventor： BOLOURCHI NADER ,  KAZAKEVICH LEONID ,  YANG RUI

IPC: H01Q21/00 ,  H04B1/707 ,  H04B7/02 ,  H04B7/06 ,  H04B7/216 ,  H04J13/00 ,  H04J99/00 ,  H04W88/08

Abstract: La cantidad de usuarios y capacidad de datos de sistemas inalámbricos aumentan por el empleo de aparatos y de un método para aumentar la cantidad de códigos de dispersión disponibles en el sistema, proveyendo un mecanismo para reutilizar el código de dispersión ya asignado o para utilizar los códigos que pueden correlacionarse con aquellos que ya se están utilizando dentro del mismo sector/célula. Esto, a su vez, provee un aumento de capacidad proporcional a la cantidad de antenas de estación base (BS) agregadas a cada célula. Una técnica de dirección nula de antena para asignación de códigos mantiene las propiedades de correlación cruzada de los códigos solamente para el usuario deseado y para obtener una ganancia en mejoramiento de capacidad.

公开(公告)号：CA2488750A1

公开(公告)日：2003-12-18

申请号：CA2488750

申请日：2003-06-05

Applicant: INTERDIGITAL TECH CORP

Inventor： YANG RUI ,  KAZAKEVICH LEONID

IPC: H03M1/18 ,  H03G3/00 ,  H03G3/20 ,  H03G3/30 ,  H03G7/06 ,  H03M1/12 ,  H04B17/40 ,  H04B17/02

Abstract: An analog/digital gain control device (30) avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit (34 ). After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) (42) is used to expand the digital signal back to the original linear scale. The word size of the outpu t of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied.

公开(公告)号：CA2466042A1

公开(公告)日：2003-05-15

申请号：CA2466042

申请日：2002-11-01

Applicant: INTERDIGITAL TECH CORP

Inventor： KAZAKEVICH LEONID ,  YANG RUI ,  BOLOURCHI NADER

IPC: H01Q21/00 ,  H04B1/707 ,  H04B7/02 ,  H04B7/06 ,  H04B7/216 ,  H04J13/00 ,  H04J99/00 ,  H04W88/08

Abstract: The number of users (USER A, USER B) and data (dA, dB) capacity of wireless systems (Fig. 1) are increased by employing apparatus and method for increasing the number of spreading codes (CA, CB) available in the system by providing a mechanism to reuse the already allocated spreading code or use t he codes that may correlate to those already being used within the same sector/cell. This, in return, provides capacity improvement proportional to the number of added base station (BS) antennas (1, 2, 3) for each cell. An antenna null steering technique for code allocation maintains the cross correlation properties of the codes only for the desired user and to obtain a gain in capacity improvement.

公开(公告)号：DE966819T1

公开(公告)日：2000-10-05

申请号：DE98910290

申请日：1998-03-11

Applicant: INTERDIGITAL TECH CORP

Inventor： MESECHER DAVID ,  YANG RUI ,  CERDA RAMON

IPC: H04L27/22 ,  H04B1/707 ,  H04B1/7085 ,  H04B1/7117 ,  H04B7/216 ,  H04L27/00 ,  H04L27/233

Abstract: A receiver for receiving a CDMA communication signal that is wirelessly transmitted includes a system for correcting phase errors in an information signal which has been transmitted. The correction system comprises circuitry for generating a mixing signal and for combining the mixing signal with said information signal to produce a correction signal. An analyzer analyzes the phase of said correction signal and generates an error signal based on the deviation of the analyzed phase from a reference phase. A bandwidth controller which recursively adjusts the phase of the correction signal such that the phase of said correction signal is substantially equal to said reference phase. The bandwidth controller then selects a bandwidth within an adjustable range based on the correction signal, estimates an offset by interrogating the error signal, and modifies said correction signal by the offset.