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Design of Compact Matched Filter Banks of Polyphase ZCZ Codes

Sho KURODA, Shinya MATSUFUJI, Takahiro MATSUMOTO, Yuta IDA, Takafumi HAYASHI

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Summary :

A polyphase sequence set with orthogonality consisting complex elements with unit magnitude, can be expressed by a unitary matrix corresponding to the complex Hadamard matrix or the discrete Fourier transform (DFT) matrix, whose rows are orthogonal to each other. Its matched filter bank (MFB), which can simultaneously output the correlation between a received symbol and any sequence in the set, is effective for constructing communication systems flexibly. This paper discusses the compact design of the MFB of a polyphase sequence set, which can be applied to any sequence set generated by the given logic function. It is primarily focused on a ZCZ code with q-phase or more elements expressed as A(N=qn+s, M=qn-1, Zcz=qs(q-1)), where q, N, M and Zcz respectively denote, a positive integer, sequence period, family size, and a zero correlation zone, since the compact design of the MFB becomes difficult when Zcz is large. It is shown that the given logic function on the ring of integers modulo q generating the ZCZ code gives the matrix representation of the MFB that M-dimensional output vector can be represented by the product of the unitary matrix of order M and an M-dimensional input vector whose elements are written as the sum of elements of an N-dimensional input vector. Since the unitary matrix (complex Hadamard matrix) can be factorized into n-1 unitary matrices of order M with qM nonzero elements corresponding to fast unitary transform, a compact MFB with a minimum number of circuit elements can be designed. Its hardware complexity is reduced from O(MN) to O(qM log q M+N).

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E103-A No.9 pp.1103-1110
Publication Date
2020/09/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.2019EAP1138
Type of Manuscript
PAPER
Category
Spread Spectrum Technologies and Applications

Authors

Sho KURODA
  Yamaguchi University
Shinya MATSUFUJI
  Yamaguchi University
Takahiro MATSUMOTO
  Yamaguchi University
Yuta IDA
  Yamaguchi University
Takafumi HAYASHI
  Nihon University

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