RU2000104503A - MULTIPLE ACCESS CODING USING FOLDED SEQUENCES FOR MOBILE RADIO SYSTEMS - Google Patents

MULTIPLE ACCESS CODING USING FOLDED SEQUENCES FOR MOBILE RADIO SYSTEMS

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Publication number
RU2000104503A
RU2000104503A RU2000104503/09A RU2000104503A RU2000104503A RU 2000104503 A RU2000104503 A RU 2000104503A RU 2000104503/09 A RU2000104503/09 A RU 2000104503/09A RU 2000104503 A RU2000104503 A RU 2000104503A RU 2000104503 A RU2000104503 A RU 2000104503A
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RU
Russia
Prior art keywords
sequence
spread spectrum
encrypted
words
digital
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RU2000104503/09A
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Russian (ru)
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RU2242819C2 (en
Inventor
Грегори Е. БОТТОМЛИ
Пол В. ДЕНТ
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Эрикссон, Инк.
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Priority claimed from US08/291,693 external-priority patent/US5550809A/en
Application filed by Эрикссон, Инк. filed Critical Эрикссон, Инк.
Publication of RU2000104503A publication Critical patent/RU2000104503A/en
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Publication of RU2242819C2 publication Critical patent/RU2242819C2/en

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Claims (9)

1. Терминал системы связи, которая содержит базовую станцию и терминал и в которой между терминалом и базовой станцией обмениваются информацией посредством связи с расширенным спектром прямой последовательности, содержащий средство для преобразования передаваемой информации в цифровые слова, средство для преобразования цифровых слов в соответствующие слова Уолша-Адамара, средство для комбинирования слов Уолша-Адамара с кодовой последовательностью для формирования кодовых слов, модулятор, использующий кодовые слова для модулирования сигнала несущей частоты, и генератор кода, генерирующий кодовую последовательность посредством тактирования по множеству внутренних состояний на основании двоичной маски, которая известна только терминалу и базовой станции.1. A communication system terminal that contains a base station and a terminal and in which information is exchanged between a terminal and a base station by communicating with a spread spectrum of a direct sequence, comprising means for converting the transmitted information into digital words, means for converting digital words into corresponding Walsh words - Hadamard, means for combining Walsh-Hadamard words with a code sequence to form code words, a modulator using code words to modulate I am a carrier frequency signal, and a code generator that generates a code sequence by clocking over a variety of internal states based on a binary mask that is known only to the terminal and base station. 2. Терминал, обеспечивающий закрытость связи при связи с сетью, в системе связи, использующей множественный доступ с расширенным спектром прямой последовательности для связи между сетью связи и терминалом, генератор последовательности, который выдает последовательность с расширенным спектром и шифрованную последовательность, причем шифрованная последовательность зависит от первой битовой комбинации, которая известна только терминалу и сети, а последовательность с расширенным спектром зависит от второй битовой комбинации, кодер, преобразующий речевой сигнал для связи в цифровые слова, причем каждое цифровое слово имеет первое число битов, шифрователь, объединяющий цифровые слова с шифрованной последовательностью для выработки шифрованных слов, причем каждое шифрованное слово имеет второе число битов, кодер расширенного спектра, комбинирующий шифрованные слова с последовательностью расширенного спектра для выработки цифрового сигнала с расширенным спектром, и средство для генерирования несущего сигнала радиочастоты, который модулирован цифровым сигналом с расширенным спектром, для связи с сетью. 2. A terminal providing closed communication when communicating with a network in a communication system using multiple access with spread spectrum of a direct sequence for communication between a communication network and a terminal, a sequence generator that provides a spread spectrum and an encrypted sequence, the encrypted sequence being dependent on the first bit combination, which is known only to the terminal and the network, and the spread spectrum depends on the second bit combination, encoder, pre an encoding speech signal for communication into digital words, each digital word having a first number of bits, an encoder combining digital words with an encrypted sequence to generate encrypted words, each encrypted word having a second number of bits, an extended encoder combining encrypted words with an extended sequence spectrum for generating a digital signal with a spread spectrum, and means for generating a carrier signal of a radio frequency that is modulated by a digital signal with Irene spectrum to communicate with the network. 3. Терминал по п. 2, в котором генератор последовательности тактирован по множеству внутренних состояний для выработки по меньшей мере одной из следующих последовательностей: шифрованной последовательности и последовательности с расширенным спектром. 3. The terminal of claim 2, wherein the sequence generator is clocked in a plurality of internal states to generate at least one of the following sequences: an encrypted sequence and a spread spectrum sequence. 4. Приемник в сети связи для сигналов, переданных подвижным терминалом, в системе подвижной связи, использующей множественный доступ с расширенным спектром прямой последовательности для связи между сетью связи и множеством подвижных терминалов, содержащий радиоприемник, вырабатывающий поток цифровых выборок основной полосы частот, генератор последовательности, который выдает последовательность с расширенным спектром и шифрованную последовательность, причем шифрованная последовательность зависит от первой битовой комбинации, которая известна только подвижному терминалу и сети, а последовательность с расширенным спектром зависит только от второй битовой комбинации, декодер расширенного спектра, комбинирующий поток цифровых выборок и последовательность с расширенным спектром для выработки групп выборок, причем каждая группа выборок содержит первое число декодированных цифровых выборок, дешифратор, комбинирующий группы выборок и шифрованную последовательность для выработки дешифрованных слов, причем каждое дешифрованное слово имеет второе число бит, и декодер, преобразующий дешифрованные слова в речевой сигнал для передачи по сети связи. 4. A receiver in a communication network for signals transmitted by a mobile terminal in a mobile communication system using direct access spread spectrum multiple access for communication between a communication network and a plurality of mobile terminals, comprising a radio receiver generating a stream of digital samples of the base frequency band, a sequence generator, which produces a spread spectrum sequence and an encrypted sequence, the encrypted sequence depending on the first bit combination The one known only to the mobile terminal and the network, and the spread spectrum depends only on the second bit combination, the spread spectrum decoder combining the stream of digital samples and the spread spectrum to generate sample groups, each sample group containing the first number of decoded digital samples, a decoder combining groups of samples and an encrypted sequence to generate decrypted words, each decrypted word having a second number of bits, and a decoder converting the decrypted words into a speech signal for transmission over a communication network. 5. Приемник по п. 4, в котором генератор последовательности тактирован по множеству внутренних состояний для выработки по меньшей мере одной из следующих последовательностей: шифрованной последовательности и последовательности с расширенным спектром. 5. The receiver of claim 4, wherein the sequence generator is clocked in a plurality of internal states to generate at least one of the following sequences: an encrypted sequence and a spread spectrum sequence. 6. Базовая станция в сети связи для обеспечения закрытости связи при связи с подвижным терминалом, в системе подвижной связи, использующей множественный доступ с расширенным спектром прямой последовательности для связи между сетью связи и множеством подвижных терминалов, содержащая генератор последовательности, который выдает последовательность с расширенным спектром и шифрованную последовательность, причем шифрованная последовательность определена первой битовой комбинацией, которая известна только подвижному терминалу и сети связи, а последовательность с расширенным спектром определена второй битовой комбинацией, кодирующее средство для преобразования речи для передачи подвижному терминалу в цифровые слова, причем каждое цифровое слово имеет первое число битов, средство шифрования для комбинирования цифровых слов и шифрованной последовательности для выработки шифрованных слов, причем каждое шифрованное слово имеет первое число битов, преобразователь, преобразующий зашифрованные слова в кодовые слова с использованием по меньшей мере одного кодового слова Уолша-Адамара, причем каждое кодовое слово имеет второе число битов и это второе число больше, чем первое число, средство для генерирования сигнала с расширенным спектром на основании кодовых слов и последовательности с расширенным спектром, и средство для генерирования несущего сигнала радиочастоты, который модулирован сигналом с расширенным спектром, для передачи подвижному терминалу. 6. A base station in a communication network for securing communication in communication with a mobile terminal, in a mobile communication system using direct access spread spectrum multiple access for communication between a communication network and a plurality of mobile terminals, comprising a sequence generator that provides a spread spectrum and an encrypted sequence, the encrypted sequence being determined by a first bit combination that is known only to the mobile terminal and the network ide, and the spread spectrum sequence is defined by a second bit combination, encoding means for converting speech for transmission to the mobile terminal in digital words, each digital word having a first number of bits, encryption means for combining digital words and an encrypted sequence to generate encrypted words, each the encrypted word has a first number of bits, a converter that converts the encrypted words into code words using at least one code word Walsh-Hadamard, wherein each codeword has a second number of bits and this second number is greater than the first number, means for generating a spread spectrum signal based on code words and a spread spectrum sequence, and means for generating a radio frequency carrier signal that is modulated by the signal spread spectrum for transmission to a mobile terminal. 7. Базовая станция по п. 6, в которой генератор последовательности тактирован по множеству внутренних состояний для генерирования по меньшей мере одной из следующих последовательностей: шифрованной последовательности и последовательности с расширенным спектром. 7. The base station of claim 6, wherein the sequence generator is clocked in a plurality of internal states to generate at least one of the following sequences: an encrypted sequence and a spread spectrum sequence. 8. Приемник подвижного терминала для сигналов, переданных базовой станцией в сети связи, в системе подвижной связи, использующей множественный доступ с расширенным спектром прямой последовательности для связи между сетью связи и множеством подвижных терминалов, содержащий генератор последовательности, который выдает шифрованную последовательность, зависящую от первой битовой комбинации, и последовательность с расширенным спектром, зависящую от второй битовой комбинации, причем первая битовая комбинация известна только подвижному терминалу и сети связи, радиоприемник, вырабатывающий поток цифровых выборок, которые представляют радиосигнал, переданный базовой станцией, средство для генерирования групп выборок на основании цифровых выборок и последовательности с расширенным спектром, причем каждая группа выборок содержит первое число декодированных цифровых выборок, преобразователь, преобразующий группу выборок в символ с использованием по меньшей мере одного кодового слова Уолша-Адамара, причем каждый символ содержит по меньшей мере один бит, средство дешифрования для комбинирования символов и шифрованной последовательности для выработки дешифрованных символов, и средство декодирования для преобразования дешифрованных символов в речевой сигнал. 8. A mobile terminal receiver for signals transmitted by a base station in a communication network in a mobile communication system using spread spectrum direct sequence access for communication between a communication network and a plurality of mobile terminals, comprising a sequence generator that provides an encrypted sequence depending on the first bit pattern, and a spread spectrum sequence depending on the second bit pattern, the first bit pattern being known only to the mobile t the terminal and the communication network, a radio generating a stream of digital samples that represent the radio signal transmitted by the base station, means for generating groups of samples based on digital samples and a spread spectrum sequence, each group of samples containing a first number of decoded digital samples, a converter converting the group symbol samples using at least one Walsh-Hadamard codeword, each symbol containing at least one bit, a decryption tool a combination of symbols and an encrypted sequence for generating decrypted symbols, and decoding means for converting the decrypted symbols into a speech signal. 9. Приемник по п. 8, в которой генератор последовательности тактирован по множеству внутренних состояний для генерирования по меньшей мере одной из следующих последовательностей: шифрованной последовательности и последовательности с расширенным спектром. 9. The receiver of claim 8, wherein the sequence generator is clocked in a plurality of internal states to generate at least one of the following sequences: an encrypted sequence and a spread spectrum sequence.
RU2000104503/09A 1994-08-16 1995-08-11 Multiple access coding using convoluted sequences for mobile radio communication systems RU2242819C2 (en)

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US08/291,693 US5550809A (en) 1992-04-10 1994-08-16 Multiple access coding using bent sequences for mobile radio communications
US08/291,693 1994-08-16

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