公开(公告)号：DE69829847T2

公开(公告)日：2006-02-23

申请号：DE69829847

申请日：1998-05-29

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM

IPC: H03M13/09 ,  H03M13/15 ,  H03M13/23 ,  H03M13/29 ,  H03M13/41 ,  H04L1/00 ,  H04L1/18 ,  H04W28/04 ,  H04W84/06

Abstract: A method of encoding data is described, comprising Reed-Solomon encoding k data symbols from k data frames and providing a Reed-Solomon encoded code word comprising the k data symbols and (n-k) parity symbols across n encoded frames; CRC block encoding the encoded frames; and convolutionally encoding the CRC encoded frames.

公开(公告)号：DE69533665T2

公开(公告)日：2006-02-16

申请号：DE69533665

申请日：1995-07-05

Applicant: QUALCOMM INC

Inventor： TIEDEMANN G ,  GILHOUSEN S ,  ODENWALDER P ,  ZEHAVI EPHRAIM ,  LEVIN A ,  WHEATLEY E

IPC: H04B7/00 ,  H04B7/005 ,  H04B7/26 ,  H04L1/00 ,  H04L1/08 ,  H04L1/12

Abstract: A method and apparatus for controlling transmission power in a variable rate communication system is disclosed. The method disclosed provides for a closed loop power control method. A first remote station controls the transmission power of a second remote station by transmitting a rate dependent power control signal to the second remote communication station. Since only the second communication knows its transmission rate a priori, it must determine its course of action in accordance with both the received power control signal and the knowledge of its transmission rate.

公开(公告)号：CA2193394C

公开(公告)日：2006-01-24

申请号：CA2193394

申请日：1995-06-22

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN ,  GILHOUSEN KLEIN S ,  WOLF JACK K ,  ZEHAVI EPHRAIM

IPC: H01Q3/24 ,  H01Q3/26 ,  H04B1/7085 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/02 ,  H04B7/26 ,  H04L1/06 ,  H04W16/28

Abstract: A system and method for adaptively sectorizing channel resources within a digital cellular communication system is disclosed herein. The system includes an antenna arrangement for providing at least first and second electromagnetic beams for receiving a first information signal transmitted by a specific one of a plurality of users, thereby generating first and second received signals. A first set of beam-forming signals are then generated from the first and second received signals. A demodulating receiver is provided for demodulating at least first and second beam-forming signals included within the first set of beam-forming signals, thereby producing first and second demodulated signals. The system further includes a tracking network for tracking multipath information signals, received from various positions and angles of incidence, based on comparison of the first and second demodulated signals.

公开(公告)号：FI116433B

公开(公告)日：2005-11-15

申请号：FI961823

申请日：1996-04-29

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM

IPC: H04B7/26 ,  H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04L1/08 ,  H04L27/30 ,  H04L27/34

Abstract: An improved system and method for communicating information at variable data rates over in-phase (I) and quadrature phase (Q) communication channels in a CDMA spread spectrum communication system is disclosed herein. In an exemplary implementation an input information signal is transmitted over either an I or Q communication channel using a direct sequence spread spectrum communication signal. The information signal is initially divided into first and second subsignals, which are respectively provided to first and second coset-encoding networks. The first coset-encoding combines the first subsignal with a first coset code, while the second coset-encoding network combines the second subsignal with a second coset code orthogonal to the first coset code. In this way the first and second coset-encoding networks are operative to produce first and second coset-encoded signals, respectively. A composite coset-encoded signal formed from the first and second coset-encoded signals is then modulated by an orthogonal function signal to provide a first modulated signal. In-phase pseudorandom noise (PNI) and quadrature phase pseudorandom noise (PNQ) signals of predetermined PN codes are used for spreading the first modulated signal for transmission to a receiver over either the I or Q communication channel, respectively. The receiver is operative to produce an estimate of the input information signal on the basis of the modulated carrier signal received over either the I or Q communication channel.

公开(公告)号：CA2165342C

公开(公告)日：2005-11-15

申请号：CA2165342

申请日：1994-06-20

Applicant: QUALCOMM INC

Inventor： BUTLER BRIAN K ,  PADOVANI ROBERTO ,  ZEHAVI EPHRAIM

IPC: H04B1/707 ,  H04L1/00 ,  H04L1/08 ,  H04L25/02 ,  H04L29/08 ,  H04L1/20 ,  H04L29/02

Abstract: A system for determining the rate at which data has been encoded in the receiver (12) of a variable-rate communications system. The data is received in symbols that are grouped in frames. When data is transmitted at full rate, the frame is filled with symbols. When the data is transmitted at less than full rate, symbols are repeated within a frame until the frame is full or the symbols are spaced apart within a frame. At an encoding rate of one fourth the full rate, for example, each symbol in the frame is repeated four times or data is transmitted one quarter of the time. The incoming frames one decoded, for example by decoder (48), and re-encoded, for example by encoder (76), at each possible data rate. A comparator, for example comparator (84), compares the re- encoded symbols with the originally received symbols and a counter, for example counter (100), counts the number of symbol errors. Ea ch decoding process produces an indication of the quality of the decoding process which may include Cyclic Redundancy Check (CRC) results , for example CRC (120), or Yamamoto Quality Metrics. The counted errors and the quality indication comprise an error metric which is passed to a processor, for example microprocessor (56). The processor analysis the error metric for each data rate and determines the mo stprobable rate at which the incoming symbols were encoded.

公开(公告)号：FI115360B

公开(公告)日：2005-04-15

申请号：FI961825

申请日：1996-04-29

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM ,  VITERBI ANDREW J

IPC: G03G15/01 ,  G06T1/00 ,  H03M13/23 ,  H03M13/27 ,  H04B1/707 ,  H04B14/04 ,  H04J3/16 ,  H04L1/00 ,  H04L1/08 ,  H04L25/22 ,  H04L27/18 ,  H04N1/46 ,  H04N1/56 ,  H04N1/60 ,  H04L27/30 ,  H04B1/69

Abstract: A communication system for transmitting variable rate data is disclosed wherein redundancy is added to the variable rate data to provide repetition symbols. The repetition symbol data is transmitted with symbol energy scaled in accordance to the rate of the variable rate data when the variable rate data is greater than or equal to a nominal data rate. When the variable rate data is less than the nominal data rate, the symbol data is transmitted at nominal symbol energy and redundancy is removed by transmission gating of a proportion of the transmission symbol data determined in accordance with the rate of the variable rate data. Furthermore, a receiver for receiving the variable rate data is disclosed which uses the redundancy in the transmitted data symbol stream to make a corrected estimate of the transmitted symbol data.

公开(公告)号：DE69433529D1

公开(公告)日：2004-03-11

申请号：DE69433529

申请日：1994-11-22

Applicant: QUALCOMM INC

Inventor： WHEATLEY E ,  PADOVANI ROBERTO ,  ZEHAVI EPHRAIM

IPC: H04J13/04 ,  H03M13/23 ,  H04B20060101 ,  H04B7/005 ,  H04B7/216 ,  H04B7/24 ,  H04L1/00 ,  H04L1/08

Abstract: A method for providing power control with variable data rate, the method comprising: receiving a data frame having an input data rate selected from a plurality of possible input data rates; selecting an encoding rate based on the input data rate; encoding data frames to produce output symbols, repeating output symbols using first and second generating polynomials and multiplexing the repeated output symbols, selecting a puncturing format to puncture data bits and producing output data having a constant output data rate for a number of possible input data rates based on a combination of input data rates, selected encoding rate and selected puncturing format for providing said variable data rate communication link; determining a frame error rate for a number of possible input data rates; calculating differences between the frame error rates and a target error rate and adjusting the power depending on whether the difference is greater, equal or less than a predetermined threshold.

公开(公告)号：AT250829T

公开(公告)日：2003-10-15

申请号：AT95924673

申请日：1995-06-22

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN P ,  GILHOUSEN KLEIN S ,  WOLF JACK K ,  ZEHAVI EPHRAIM

IPC: H01Q3/24 ,  H01Q3/26 ,  H04B1/7085 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/26 ,  H04L1/06 ,  H04W16/28 ,  H04Q7/36

Abstract: A system and method for adaptively sectorizing channel resources within a digital cellular communication system is disclosed herein. The system includes an antenna arrangement for providing at least first and second electromagnetic beams for receiving a first information signal transmitted by a specific one of a plurality of users, thereby generating first and second received signals. A first set of beam-forming signals are then generated from the first and second received signals. A demodulating receiver is provided for demodulating at least first and second beam-forming signals included within the first set of beam-forming signals, thereby producing first and second demodulated signals. The system further includes a tracking network for tracking multipath information signals, received from various positions and angles of incidence, based on comparison of the first and second demodulated signals.

公开(公告)号：DE69528910T2

公开(公告)日：2003-09-11

申请号：DE69528910

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM

IPC: H04B7/15 ,  H04B7/216 ,  H04J11/00 ,  H04L1/12 ,  H04L27/30 ,  H04Q7/22 ,  H04Q7/24 ,  H04Q7/26 ,  H04Q7/30 ,  H04J13/00

公开(公告)号：DE69609158T2

公开(公告)日：2001-03-22

申请号：DE69609158

申请日：1996-01-03

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM ,  CARTER S ,  GILHOUSEN S

IPC: H04B1/04 ,  H04B1/7075 ,  H04B1/7085 ,  H04B1/7087 ,  H04B1/7117 ,  H04B7/216 ,  H04Q7/00

Abstract: Method and apparatus for tracking the frequency and phase of signals in spread spectrum communication systems that makes more efficient use of available carrier frequency and phase information by utilizing a substantial portion or all of the energy occupying the frequency spectrum of a received carrier signal, including energy from communication signals intended for other system users. Multiple spread spectrum communication signals are input in parallel to data receivers where they are despread using preselected despreading codes at an adjustable phase angle and decoded over multiple orthogonal codes active within the communication system. Multiple decoded signals are then combined to form a single phase detection signal which is used by at least one tracking loop to track frequency and phase of the carrier signal for the received communication signals. The tracking loop generates a timing signal which is used to adjust the phase angle used during despreading. In further embodiments, the communication signals are despread using appropriate PN codes and separated into in-phase (I) and quadrature channels (Q) where data symbols are processed by fast Hadamard transformers to generate corresponding data bits. The data is formed into pairwise products between the channels and summed over multiple or all active subscriber orthogonal codes. This sum indicates a degree to which the estimated phase differs from the actual phase of received communication signals and is used to adjust the phase of application for the PN codes.