Yoshihiro Tanada

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Two-valued integrand codes are applied to the realization of the multi-rate quasi-synchronous CDMA system using real-valued self-orthogonal finite-length sequences with zero correlation zone. Each user data of multi-level and multi-interval and a common synchronizing sequence are convolved with the user sequence and converted to two-valued integrand code(More)
Huffman sequence has impulsive autocorrelation function and is applicable to radar and communications. This paper describes approximate expression for the sequence and considers sequence values. The sequence spectrum is expanded to polynomial groups related to approximate sequences. The first-order approximate sequence with real value is similar to a(More)
This paper proposes to construct a set of Huffman sequences with long length and low crosscorrelations for the application to multiple radar and communications. The sequence set is constructed from even-length base sequences whose lengths minus 1 are prime to each other. A base sequence given by a convolution between a sequence with length 2 and the other(More)
Huffman sequences with long length are generated for the application to high attenuation sonar or radar. A general expression of Huffman sequence is given by polynomial expansion of its spectrum. For long length, the fist-order approximate sequence is given by a DFT expression and the estimate absolute value of the sequence is represented by a Gaussian(More)
The next generation mobile communication system is desired to transmit multimedia information at multi-rate. Two-valued integrand codes are applied to the realization of the multi-rate quasi-synchronous CDMA system using real-valued self-orthogonal finite-length sequences with zero correlation zone. Each user data of multi-level and multi-interval and a(More)
A real-valued self-orthogonal finite-length sequence has an impulsive autocorrelation function with zero sidelobes except both shift ends. This paper presents a convolutional data transmission system using the sequence. A synchronizing sequence and a data train are convolved with another sequence, to be changed to a Gaussian signal. The signal is quantized(More)
A spread spectrum mesh communication system using orthogonal Huffman sequences is proposed. Each user is assigned an orthogonal sender's sequence with negative shift-end correlation value and a receiver's sequence with positive one. The convolution between the sender's sequence of a user and the receiver's sequence of the other user generates the orthogonal(More)
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