DE69936455C5 - Kommunikationsverfahren und -vorrichtungen, die auf orthogonalen hadamard-basierten sequenzen mit ausgewählten korrelationseigenschaften beruhen - Google Patents

Abstract

A method of determining a scrambling code group for a received signal in a digital communication system, in which signals are scrambled by respective scrambling codes, the scrambling codes are assigned to respective scrambling code groups, identities of the scrambling code groups are encoded in the signals by respective code-word-wise cyclically distinct sequences of S-Hadamard code words, wherein the digital communication system has a base station and a mobile station,the method comprising the steps of:the mobile station- receiving the signal,wherein an identity of a scrambling code group of the base station specific scrambling code is encoded in the signal as one of a plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words,wherein each of the S-Hadamard code words is selected from a set of N orthogonal S-Hadamard sequences of length M, the N orthogonal S-Hadamard sequences given by[S0hi·L+k,0, s1hi·L+k,1,...,SM-1hi·L+k,M-1] for i = 0, 1, ..., N-1 wherein [hi*L+k,0,hi*L+k,1, ..., hi*L+K,M-1] is the (i*L+k)-th row of a Sylvester-type Hadamard matrix of order M,wherein [S0, S1, ..., SM-1] is a special sequence, wherein M and N are integer powers of two, N is smaller than M, and L equals M/N,wherein k is a constant integer value selected from the range [0, L-1],- correlating (604) the received signal to cyclic shifts of each of the plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words;- combining (606) the correlations for each of the plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words; and- determining (608) a maximal combined correlation to identify the scrambling code group for the received signal.

Description

• Der X. Zivilsenat des Bundesgerichtshofs hat auf die mündliche Verhandlung vom 19. November 2020
  für Recht erkannt:
• Auf die Berufung der Beklagten wird das Urteil des 5. Senats (Nichtigkeitssenats) des Bundespatentgerichts vom 20. Juni 2018
• Das europäische Patent 1 105 991 wird mit Wirkung für das Hoheitsgebiet der Bundesrepublik Deutschland insoweit für nichtig erklärt, als seine Patentansprühe 11 bis 14, 19 und 36 entfallen, seine Patentansprüche 3, 7, 17 und 34 die folgende Fassung erhalten und sich die Rückbezüge auf Anspruch 3 in den Patentansprüchen 4 bis 6, auf Anspruch 7 in den Patentansprüchen 8 bis 10, auf Anspruch 17 in Patentanspruch 18 sowie auf Anspruch 34 in den Patentansprüchen 35 und 37 jeweils auf diese Fassung beziehen:

Claims (4)

1. A method of determining a scrambling code group for a received signal in a digital communication system, in which signals are scrambled by respective scrambling codes, the scrambling codes are assigned to respective scrambling code groups, identities of the scrambling code groups are encoded in the signals by respective code-word-wise cyclically distinct sequences of S-Hadamard code words, wherein the digital communication system has a base station and a mobile station, the method comprising the steps of: the mobile station - receiving the signal, wherein an identity of a scrambling code group of the base station specific scrambling code is encoded in the signal as one of a plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words, wherein each of the S-Hadamard code words is selected from a set of N orthogonal S-Hadamard sequences of length M, the N orthogonal S-Hadamard sequences given by [S₀h_i·L+k,0, s₁h_i·L+k,1,...,S_M-1h_{i·L+k, M-1}] for i = 0, 1, ..., N-1 wherein [h_i*L+k,0, h_i*L+k,1, ..., h_{i*L+K, M-1}] is the (i*L+k)-th row of a Sylvester-type Hadamard matrix of order M, wherein [S₀, S₁, ..., S_M-1] is a special sequence, wherein M and N are integer powers of two, N is smaller than M, and L equals M/N, wherein k is a constant integer value selected from the range [0, L-1], - correlating (604) the received signal to cyclic shifts of each of the plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words; - combining (606) the correlations for each of the plurality of code-word-wise cyclically distinct sequences of S-Hadamard code words; and - determining (608) a maximal combined correlation to identify the scrambling code group for the received signal.
2. A digital radio transmission system having at least one transmitter, which is a base station, and at least one receiver, which is a mobile station, wherein the digital radio transmission system comprises: - means in the transmitter for generating a synchronization signal that includes signed versions of S-Hadamard sequences selected from a set of N orthgonal S-Hadamard sequences of length M, wherein the N orthogonal S-Hadamard sequences are given by [s₀h_i·L+k,0, S₁h_i·L+k,1,..., s_M-1h_i·L+k, _M-1] for i = 0, 1, ..., N-1 wherein [h_i*L+k,0, h_i*L+k,1,..., h_{i*L+K, M-1}] is the (i*L+k)-th row of a Sylvester-type Hadamard matrix of order M, wherein [So, S₁, ..., S_M-1] is a special sequence having complex elements of constant magnitude, wherein M and N are integer powers of two, N is smaller than M, and L equals M/N, wherein k is a constant integer value selected from the range [0, L-1], - means in the receiver for estimating a time location and sequence identity of a received version of the synchronization signal based on the signed versions of S-Hadamard sequences included in the received version of the synchronization signal.
3. A method of determining a time location of a received signal and identifying a Walsh-Hadamard sequence encoded as a S-Hadamard sequence included in the received signal in a digital communication system that has a base station and a mobile station, wherein the S-Hadamard sequence is a product of the Walsh-Hadamard sequence and a special sequence having complex elements of constant magnitude and the Walsh-Hadamard sequence is a member of a first set of Walsh-Hadamard sequences, wherein the S-Hadamard sequence is a member of a set of N orthogonal S-Hadamard sequences, the method comprising the steps of: the mobile station - receiving the signal, wherein an identity of a scrambling code group of the base station specific scrambling code is encoded in the signal as a code-word-wise cyclically distinct sequence of S-Hadamard code words, wherein each of the S-Hadamard code words is selected from the set of N orthogonal S-Hadamard sequences of length M, the N orthogonal S-Hadamard sequences given by [s₀h_i·L+k,₀, S₁h_i·L+k,1,..., S_M-1h_{i•L+k, M-1}] for i = 0, 1, ..., N-1 wherein [h_{i*L+k, 0,} h_{i*L+k, 1,} ..., h_{i*L+K, M-1}] is the (i*L+k)-th row of a Sylvester-type Hadamard matrix of order M, wherein [So, S₁, ..., S_M-1] is a special sequence having complex elements of constant magnitude, wherein M and N are integer powers of two, N is smaller than M, and L equals M/N, wherein k is a constant integer value selected from the range [0, L-1], - forming a position-wise product of the received signal and the special sequence, - correlating the product with each of a plurality of Walsh-Hadamard sequences for identifying the Walsh-Hadamard sequence encoded in the received signal, and - determining the time location of the received signal based on the identified Walsh-Hadamard sequence.
4. An apparatus for use in determining a scrambling code group for a received signal in a digital communication system, in which signals are scrambled by respective scrambling codes, the scrambling codes are assigned to respective scrambling code groups, identities of the scrambling code groups are encoded in the signals by respective S-Hadamard code words, wherein an identity of a scrambling code group of the base station specific scrambling code is encoded in the signal as a code-word-wise cyclically distinct sequence of S-Hadamard code words, wherein each of the S-Hadamard code words is selected from a set of N orthogonal S-Hadamard sequences of length M, the N orthogonal S-Hadamard sequences given by [S₀h_{i·L+k, 0,} s₁h_i•L+k,1,..., S_M-1h_{i·L+k, M-1}] for i = 0, 1, ..., N-1 wherein [h_i*L+k, _0, h_{i*L+k, 1},..., h_{i*L+K, M-1}] is the (i*L+k)-th row of a Sylvester-type Hadamard matrix of order M, wherein [So, S₁, ..., S_M-1] is a special sequence, wherein M and N are integer powers of two, N is smaller than M, and L equals M/N, wherein k is a constant integer value selected from the range [0, L-1]; the apparatus comprising: an S-Hadamard code word generator (904) that produces at least one S-Hadamard code word based on the special sequence, wherein S-Hadamard code words correspond to respective members of a set of Walsh-Hadamard sequences position-wise scrambled with the special sequence; and a decorrelator (902), wherein the decorrelator forms at least one correlation of the received signal with at least one S-Hadamard code word produced by the S-Hadamard code word generator.