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| Device for generating a digitally modulated test signal |
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| Spectrum spread transmission method and apparatus |
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| Battery-feed circuit for exchange |
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| Apparatus and method for mapping E1 signals into a digital cross-connect matrix space |
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| Device for demodulating signals modulated by frequency-shift keying |
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| Interface device for converting a computer printer port into an input/output port |
| The present invention is an interface device in which the printer port of a PC can be used as an ... |
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| Digital direct sequence spread spectrum receiver |
| OF ILLUSTRATED EMBODIMENTS FIG. 1 shows a block diagram of a direct sequence spread spectrum ... |
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| CDMA mobile communication system and method with improved phase correction features |
| It is an object of the present invention to provide a mobile station of a CDMA mobile communication ... |
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Diversity transmitter/receiver
| Details |
Inventors: Tsujimoto, Ichiro;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Chin; Stephen
Assistant Examiner: Kim; Kevin
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
After coding transmission data by means of an error-correction coder, the data are divided into N branches, pass through a plurality of delay elements, undergo interleaving in an interleave circuit, primary modulation in a modulator, undergo spread-spectrum processing in a spread-spectrum circuit, and are coded/multiplexed in a synthesizer, and finally transmitted. The signals transmitted by the transmitter are divided into N branches by a branch circuit, undergo inverse spread-spectrum processing in inverse spread-spectrum circuits, undergo demodulation in a demodulator corresponding to the primary modulation on the transmission side, undergo de-interleaving at a de-interleave circuit, and after delay coordination at delay elements, undergo majority-discrimination at a majority-discrimination circuit, and finally are error corrected in an error-correction decoding circuit. |
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DETAILED DESCRIPTION The object of the present invention is to provide a spread-spectrum diversity transmitter/receiver having a limited scale and moreover, that ensures constant and stable diversity branches.
The first spread-spectrum diversity transmitter/receiver according to the present invention includes: a transmitter that includes error-correction coding means for error-correction coding data to be sent, delay means for conferring differing delay times for each branch signal derived by dividing output of the error-correction coding means into a plurality of branches, interleave means for interleaving each branch output of the delay means, modulating means for individually modulating each branch output of the interleave means, spread-spectrum means for spreading the spectrum of each branch output of the modulating means by differing diffusion codes, synthesizing means for synthesizing and coding/multiplexing the output of the spread spectrum means, and transmitting means for transmitting the coded/multiplexed signal; and a receiver that includes receiving means for receiving the coded/multiplexed signal, branching means for branching the received signal, inverse spread-spectrum means for inverse-spreading the spectrum of each branch signal by means of the plurality of diffusion codes of the transmitting side, demodulating means for individually demodulating each of the received signals of the plurality of branches that have been coded and separated by the inverse spread-spectrum means, de-interleave means for executing de-interleaving which is the reverse of interleaving of the transmitting side upon the plurality of demodulated branches of received signals, delay means for delay coordination of each branch output of the de-interleave means by conferring differing delay times so as to absorb delay differences between branches conferred by the delay means of the transmitting side, majority-discriminating means for majority discrimination of each branch signal derived by the delay means, and error-correction decoding means for performing error-correction decoding of the discrimination data of the majority-discriminating means
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Multiplexer-related 
