公开(公告)号：DE60331728D1

公开(公告)日：2010-04-29

申请号：DE60331728

申请日：2003-07-15

Applicant: ST MICROELECTRONICS SA ,  ST MICROELECTRONICS SRL

Inventor： MESSINA ETTORE ,  PIAZZESE NICOLO IVAN ,  LIPPOLIS GIUSEPPE ,  SALURSO ELENA ,  SERRATORE ALBERTO ,  GALLUZZO AGOSTINO

IPC: H03G3/00 ,  H03G3/20 ,  H03M1/18

Abstract: A method for automatic gain control, e.g. in a receiver for a mobile telecommunication system comprises the operations of: mixing (13) a received signal (Sin) with an error signal (Perr, Pf); performing an analog-to-digital conversion (14) on the result of said mixing operation, in order to obtain a controlled output signal (x(t), Sout); measuring (25) the power (Pmeas) of said controlled output signal (x(t), Sout); subtracting the measured power (Pmeas) from a reference power (Pref) in order to obtain said error signal (Perr, Pf). According to the proposed method the operation of measuring the power of the controlled output signal (x(t), Sout) comprises: setting at least a power threshold (Th;Th1, Th2, Th3); measuring (27) a rate of crossings of said power threshold (Th; Th1, Th2, Th3) by said controlled output signal (x(t), Sout) in a given observation window; deriving (29) from said number of crossings the measured power value (Pmeas, sigma 2=1). The proposed method is particularly suitable for application in receivers of mobile telecommunication systems based on CDMA (Code Division Multiple Access), but also for mobile telecommunication system according to GSM, UMTS, CDMA2000, IS95 o WBCDMA standards and satellite telecommunication systems.

公开(公告)号：DE60233056D1

公开(公告)日：2009-09-03

申请号：DE60233056

申请日：2002-10-11

Applicant: ST MICROELECTRONICS SRL

Inventor： PAPPALARDO FRANCESCO ,  AVELLONE GIUSEPPE ,  SALURSO ELENA ,  GALLUZZO AGOSTINO

IPC: H04B1/707

Abstract: To obtain frame synchronization and identify the cell codegroup in a cellular communication system (such as a system based upon the standard 3GPP FDD), there are available the synchronization codes (SSCH) organized in chips or letters transmitted at the beginning of respective slots. Slot synchronization is obtained previously in a first step of the operation of cell search. During a second step, there are acquired, by means of correlation (10) or fast Hadamard transform, the energy values corresponding to the respective individual letters with reference to the possible starting positions of the corresponding frame within the respective slot. Operating in a serial way (24) at the end of acquisition of the aforesaid energy values of the individual letters, or else operating in parallel, the energies of the corresponding words are determined. Of these eneriges only the maximum word-energy value and the information for the corresponding starting position are stored in a memory structure (22). Said maximum value and said starting position identify, respectively, the cell codes and the frame synchronization sought. A preferential application is in mobile communication systems based upon standards such as UMTS, CDMA2000, IS95, or WBCDMA.

公开(公告)号：DE602004018260D1

公开(公告)日：2009-01-22

申请号：DE602004018260

申请日：2004-02-06

Applicant: ST MICROELECTRONICS SRL

Inventor： RIMI FRANCESCO ,  SERRATORE ALBERTO ,  AVELLONE GIUSEPPE ,  PAPPALARDO FRANCESCO ,  GALLUZZO AGOSTINO

IPC: H04B1/707

Abstract: In order to perform, according to a received signal (r), a channel-estimation procedure and a cell-search procedure in cellular communication systems, there are executed at least one first operation of correlation of said received signal (r) with secondary synchronization codes (SSC) and a second operation of correlation of said received signal (r) with known midamble codes (mid, MPL, MPS), whilst said channel-estimation procedure comprises a third operation of correlation of at least part of said received signal (r) with known midamble codes (mid, MPL, MPS), said first, second, and third correlation operation being executed by sending at least part (emidamble) of said received signal (r) to an input of a correlation bank (111, 151; 203, 253; 303). There are envisaged the operations of: sending, in a first time interval, the received signal (r) to said correlation bank (303) for executing the first operation of correlation of said received signal (r) with secondary synchronization codes (SSC); sending, in a second time interval, at least part (emidamble) of said received signal (r) to said same correlation bank (303) for executing the second operation of correlation of said received signal (r) with known midamble codes (mid, MPL, MPS); sending, in a second time interval, the received signal (r) to said same correlation bank (303) for executing the third operation of correlation of at least part (emidamble) of said received signal (r) with known midamble codes (mid, MPL, MPS). Preferential application is in mobile communication systems based upon standards such as UMTS, CDMA2000, IS95 or WBCDMA.

公开(公告)号：DE60008716T2

公开(公告)日：2005-02-10

申请号：DE60008716

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G06T9/00 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/196 ,  H04N19/60 ,  H04N7/30

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of splitting (455) the digital image into a plurality of blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each block using a corresponding quantization table scaled by a gain factor for achieving a target compression factor; the method further comprises the steps of determining (440) at least one energy measure of the digital image, and estimating (441-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to the target compression factor.

公开(公告)号：DE60039689D1

公开(公告)日：2008-09-11

申请号：DE60039689

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G02B7/36 ,  H04N5/232 ,  H04N5/235 ,  H04N19/122 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/42 ,  H04N19/60

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of providing (410-430) an incomplete digital image wherein at least one component is missing in each element, obtaining (433-435) the digital image from the incomplete digital image, splitting (455) the digital image into blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each group using a corresponding quantization table scaled by a gain factor; the method further comprises the steps of determining (440) at least one energy measure of the incomplete digital image and estimating (445-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to a target compression factor.

公开(公告)号：DE60319832D1

公开(公告)日：2008-04-30

申请号：DE60319832

申请日：2003-10-13

Applicant: ST MICROELECTRONICS SRL

Inventor： VISALLI GIUSEPPE ,  PAPPALARDO FRANCESCO ,  AVELLONE GIUSEPPE ,  RIMI FRANCESCO ,  GALLUZZO AGOSTINO

IPC: H03M13/25 ,  H04L1/00 ,  H04L25/06 ,  H04L27/00 ,  H04L27/227 ,  H04L27/233

Abstract: A phase recovery and decoding method for decoding signals (S'(t)) comprising encoded symbols (uk) over a respective symbol interval (T) which modulate a carrier, for example in a TCM system. The method envisages performing (20 to 26) a phase locking of the signal to be decoded so as to obtain a phase-locked signal which can present, during each symbol interval (T), variations induced by disturbances (noise, fading, etc.). The value attributed to the decoded symbol (Uk) is a function of the value assumed by the phase-locked signal on at least one subinterval of the symbol interval (T), for example located at the end of the symbol interval (T). Alternatively, the value assumed by the phase-locked signal on a plurality of subintervals comprised in each symbol interval (T) is detected (24,32), and a respective majority value of said phase-locked signal within said plurality of subintervals is identified (34,36). A suitable phase recovery and decoding circuit comprises a phase comparator (20), hard decision means (24), an encoder circuit (26), an oscillator (22) and a selection unit (28). For determining decoded value (Uk) and updating the state of the encoder circuit.

公开(公告)号：ITTO20021082A1

公开(公告)日：2004-06-14

申请号：ITTO20021082

申请日：2002-12-13

Applicant: ST MICROELECTRONICS SRL

Inventor： AVELLONE GIUSEPPE ,  GALLUZZO AGOSTINO ,  PAPPALARDO FRANCESCO ,  RIMI FRANCESCO ,  VISALLI GIUSEPPE

IPC: G06F20060101 ,  H04B1/707

公开(公告)号：DE60325163D1

公开(公告)日：2009-01-22

申请号：DE60325163

申请日：2003-09-15

Applicant: ST MICROELECTRONICS SRL

Inventor： AVELLONE GIUSEPPE ,  RIMI FRANCESCO ,  PAPPALARDO FRANCESCO ,  GALLUZZO AGOSTINO ,  VISALLI GIUSEPPE

IPC: H04B1/707

公开(公告)号：DE60211846D1

公开(公告)日：2006-07-06

申请号：DE60211846

申请日：2002-03-07

Applicant: ST MICROELECTRONICS SRL

Inventor： LO IACONO DANIELE ,  MESSINA ETTORE ,  AVELLONE GIUSEPPE ,  GALLUZZO AGOSTINO

IPC: H04J13/00 ,  H04J13/10

Abstract: In order to generate the main scrambling code of order N and the secondary scrambling code of order K within the set identified by the primary scrambling code of order N, a first m-sequence and a second m-sequence are generated using Fibonacci linear feedback shift registers (LFSRs). Then said first m-sequence and said second m-sequence are modulo-2 added so as to form the I branch of said primary scrambling code. A first T-bit masking word and a second T-bit masking word of rank 0 (X0-MASK, Y0-MASK) are generated that correspond to the polynomial time shifts (X0 (D), Y0 (D)), and the intermediate taps of the X and y registers respectively chosen by means of said masking words (X0-MASK, Y0-MASK) are modulo-2 added so as to generate a third sequence and a fourth sequence which are modulo-2 added together to form the Q branch of said primary scrambling code. With the choice, starting from the least significant Kmax bits of the register X, of the K-th intermediate tap corresponding to the secondary scrambling code of order K within said set identified by the primary scrambling code of order N, a fifth sequence is generated, which, modulo-2 added to said second sequence, forms the I branch of said secondary scrambling code. By modulo-2 summing the intermediate taps of the register X masked by means of the aforesaid first masking word of rank N (XN-MASK), a sixth sequence is generated, which, modulo-2 added to the aforesaid fourth sequence, forms the Q branch of the secondary scrambling code.

公开(公告)号：DE60008716D1

公开(公告)日：2004-04-08

申请号：DE60008716

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G06T9/00 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/196 ,  H04N19/60 ,  H04N7/30

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of splitting (455) the digital image into a plurality of blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each block using a corresponding quantization table scaled by a gain factor for achieving a target compression factor; the method further comprises the steps of determining (440) at least one energy measure of the digital image, and estimating (441-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to the target compression factor.