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公开(公告)号：AU7208800A
公开(公告)日：2001-06-28
申请号：AU7208800
申请日：2000-12-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BHATOOLAUL DAVID LAHIRI , MONOGIOUDIS PANTELIS
Abstract: A receiver in a code-division, multiple-access (CDMA) communication system employs a preamble detector for random access channels (e.g., RACHs). RACHs may use orthogonal Gold code (OGC) sequences for preamble signature sequences and/or spreading of the preamble signature sequence with OGC sequences. A preamble detector may employ a fast orthogonal Gold transform (FOGT) for both despreading (e.g., correlation with code numbers C1,...,C256)) and for generating a decision statistic for detecting (identifying) the signature sequence used in the preamble. The spread signal of the RACH is applied to a code matched filter (CMF) matched to the spreading OGC sequence and the output signal of the CMF is sampled at the symbol rate. A fast Hadamaard transform (FHT) is applied to the sampled output of the CMF, and the exemplary 16th order code-words of the FHT match the 16 Walsh signature sequences employed to distinguish user channels transmitted by user equipment. A fast OGC transform (FOGT) may be applied to the sampled output of the CMF if OGC sequences are used as signature sequences. The signals generated by the FHT may be split into two branches for processing: a reference branch and a data branch. The reference branch processes the FHT generated signals to estimate channel response characteristics, provide a de-rotation signal, and perform frequency acquisition if required. For the reference branch, the squared magnitude of each complex FHT vector signal of length 16 is calculated and the maximum value is set as index i, where i ELEMENT ä1,.....16ü. The maximum index i is employed as a preliminary, non-coherent decision statistic corresponding to the index value of the Walsh signature sequence used for the spread signal of the access channel. The index i of the reference branch may then be used by: 1) a Walsh generator to reproduce the Walsh (BPSK) signature sequence; 2) a selector to select one of the 16 FHT output signals to estimate channel response characteristics; and 3) as a non-coherent decision statistic for subsequent processing by the detector.
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公开(公告)号：DE60132288T2
公开(公告)日：2009-01-02
申请号：DE60132288
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOPALAKRISHNAN NANDU , HU TECK H , KHAN FAROOQ ULLAH , KOGIANTIS ACHILLES GEORGE , MONOGIOUDIS PANTELIS , SAMPATH ASHWIN
Abstract: A transport channel multiplexing system provides improved use of wireless resources in a shared data channel system. For example, the transport channel system reduces the amount of transport format information required for using a shared data channel, such as the actual number of packet data units in a transport channel of the shared data channel. Additionally, by scheduling or multiplexing coded sub-blocks from one or more transport channels over the shared data channel, the transport channel multiplexing system can provide improved integration with other important features, such as incremental redundancy, fast adaptation to channel conditions and transport channel dependent quality of service (QOS) control, to provide improved system performance.
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公开(公告)号：CA2330267C
公开(公告)日：2006-03-14
申请号：CA2330267
申请日：2001-01-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MONOGIOUDIS PANTELIS , REGE KIRAN M , SAMPATH ASHWIN
Abstract: In a wireless communications system, a base station employs a bit error rate (BER) based Reverse Outer Loop Power Control (ROLPC) technique. The ROLPC techniqu e uses either instantaneous or weakly filtered values of the BER for compariso n with a BER target value for adjusting a target signal-to-noise ratio (SNR). The BER target value is varied as a function of a second order statistic (e.g. variance, standard deviation) of the received SNR. In another embodiment, a symbol error count based ROLPC technique uses adaptive SER targets. In particular, a base station uses a 2nd order statistic, e.g., standard deviation (variance), to identify, or act as a signature of, a particular cellular (wireless) communications environment. The base station monitors the standar d deviation of the symbol error count of a received signal (transmitted from a mobile station). The target signal-to-noise ratio ((E b/N0)T) of this received signal is adjusted as a function of the value of the standard deviation and the adjusted (E b/N0)T target is used to provide power control.
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公开(公告)号：CA2273529A1
公开(公告)日：2000-01-28
申请号：CA2273529
申请日：1999-06-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MONOGIOUDIS PANTELIS , CAO QIANG , LIN JIE
Abstract: The invention described is a packet switched communications system in which a station communicates with at least one user over downlink communication channel, the downlink communication channel being divided into a plurality of frames and each flame including a plurality of data packets. Each data packet is directed to a predetermined user and includes transmission power control information for said user. An extended transmission power control information field is provided in at least one data packet in every frame, which includes transmission power control information for at least one other user of the communication system.
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公开(公告)号：AT383688T
公开(公告)日：2008-01-15
申请号：AT01304725
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOPALAKRISHNAN NANDU , HU TECK H , KHAN FAROOQ ULLAH , KOGIANTIS ACHILLES GEORGE , MONOGIOUDIS PANTELIS , SAMPATH ASHWIN
Abstract: A transport channel multiplexing system provides improved use of wireless resources in a shared data channel system. For example, the transport channel system reduces the amount of transport format information required for using a shared data channel, such as the actual number of packet data units in a transport channel of the shared data channel. Additionally, by scheduling or multiplexing coded sub-blocks from one or more transport channels over the shared data channel, the transport channel multiplexing system can provide improved integration with other important features, such as incremental redundancy, fast adaptation to channel conditions and transport channel dependent quality of service (QOS) control, to provide improved system performance.
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Patent Agency Ranking
公开(公告)号：AT287599T
公开(公告)日：2005-02-15
申请号：AT01304723
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
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公开(公告)号：CA2329549A1
公开(公告)日：2001-09-14
申请号：CA2329549
申请日：2000-12-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： REGE KIRAN M , MONOGIOUDIS PANTELIS , JIANG HONG , AHMED WALID , KODIALAM MURALIDHARAN SAMPATH
Abstract: In an ad-hoc mobile network, a geometry-based routing protocol (GRP) is used to route traffic from a source node to a destination node. In order for GRP to be effective, the network needs to have certain routability characteristics. To that end, each node collects location information from surrounding nodes and uses the collected location information to select those surrounding nodes that facilitate geometric routing and sets up point-to-point links with the selected nodes (becoming direct neighbors). Th e node then constructs its k-neighborhood, (where the value of k represents the maximum number of hops needed to reach any node in the desired local topology) by exchanging i ts list of direct neighbor nodes with other nodes.
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公开(公告)号：CA2330267A1
公开(公告)日：2001-08-28
申请号：CA2330267
申请日：2001-01-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SAMPATH ASHWIN , MONOGIOUDIS PANTELIS , REGE KIRAN M
IPC: H04L1/00 , H04B7/005 , H04B7/26 , H04J13/00 , H04W52/12 , H04W52/20 , H04W52/22 , H04W52/24 , H04Q7/36
Abstract: In a wireless communications system, a base station employs a bit error rate (BER) based Reverse Outer Loop Power Control (ROLPC) technique. The ROLPC techniqu e uses either instantaneous or weakly filtered values of the BER for compariso n with a BER target value for adjusting a target signal-to-noise ratio (SNR). The BER target value is varied as a function of a second order statistic (e.g. variance, standard deviation) of the received SNR. In another embodiment, a symbol error count based ROLPC technique uses adaptive SER targets. In particular, a base station uses a 2"a order statistic, e.g., standard deviation (variance), to identify, or act as a signature of, a particular cellular (wireless) communications environment. The base station monitors the standar d deviation of the symbol error count of a received signal (transmitted from a mobile station). The target signal-to-noise ratio ((Eb/Na)T) of this received signal is adjusted as a function of the value of the standard deviation and the adjusted (Eb/Na)T target is used to provide power control.
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公开(公告)号：AU4116799A
公开(公告)日：2000-02-17
申请号：AU4116799
申请日：1999-07-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CAO QIANG , MONOGIOUDIS PANTELIS , LIN JIE
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公开(公告)号：DE60132288D1
公开(公告)日：2008-02-21
申请号：DE60132288
申请日：2001-05-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOPALAKRISHNAN NANDU , HU TECK H , KHAN FAROOQ ULLAH , KOGIANTIS ACHILLES GEORGE , MONOGIOUDIS PANTELIS , SAMPATH ASHWIN
Abstract: A transport channel multiplexing system provides improved use of wireless resources in a shared data channel system. For example, the transport channel system reduces the amount of transport format information required for using a shared data channel, such as the actual number of packet data units in a transport channel of the shared data channel. Additionally, by scheduling or multiplexing coded sub-blocks from one or more transport channels over the shared data channel, the transport channel multiplexing system can provide improved integration with other important features, such as incremental redundancy, fast adaptation to channel conditions and transport channel dependent quality of service (QOS) control, to provide improved system performance.
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