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    1.
    发明专利
    未知

    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.

    2.
    发明专利
    未知

    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.

    5.
    发明专利
    未知

    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.

    7.
    发明专利
    未知

    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.

    8.
    发明专利
    未知

    公开(公告)号：ITTO20000871A1

    公开(公告)日：2002-03-15

    申请号：ITTO20000871

    申请日：2000-09-15

    Applicant: ST MICROELECTRONICS SRL

    Inventor： LATTUCA ALESSANDRO ,  AVELLONE GIUSEPPE ,  MESSINA ETTORE ,  GALLUZZO AGOSTINO

    IPC: C06F20060101 ,  H04B7/216 ,  H04J13/00 ,  H04J13/12 ,  H04K1/00 ,  H04L9/00

    Abstract: The device can be used for generating, in the framework of a CDMA communications terminal, both Walsh-Hadamard channeling codes and OVSF channeling codes. The device comprises a code generator preferably configured for generating Walsh-Hadamard codes. When the device is used for generating Walsh-Hadamard codes, the corresponding index values, applied to an input of the device, are sent to the input of the code generator. Generation of OVSF codes envisages, instead, that the corresponding indices, sent to an input of the device, undergo mapping, which enables generation, starting from the OVSF code, of the corresponding index identifying a string of symbols that is identical within the Walsh-Hadamard code. In this way each string of OVSF code symbols is generated, so producing, by means of the code generator, the generation of the identical string of symbols included in the Walsh-Hadamard code.

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