In uplink cellular environments, random access preamble detection (RAPD) is achieved by identifying possibly multiple received requesting orthogonal frequency-division multiplexing (OFDM) signals carrying arbitrarily-chosen constant-amplitude (CA) preamble sequences through threshold comparison. Such threshold-based RAPD is analytically studied in terms of false alarm, outage, and false identification probabilities for the receiver operating under independent Rician/Rayleigh multipath channels and in the presence of time offsets among multiple received requesting OFDM signals. The RAPD system is shown to operate under less influence of inter-sequence interference when the preamble sequence set consists of mutually orthogonal CA sequences and contains as many ϖmin-permissible cyclically-shiftable constant-amplitude (CSCA) sequences as possible, where assigning (MPMA) and Zadoff-Chu sequence families, which are min-permissible CSCA sequences are cyclically shifted from each other with a minimum cyclic-shift-distance ϖmin in time domain. The performance characteristics are thus demonstrated for the RAPD systems adopting the modified phase-model-assigning (MPMA) and Zadoff-Chu sequence families, which are comprised of orthogonal and nonorthogonal, respectively, ϖmin-permissible CSCA sequence subfamilies. While constraining upper false-alarm and outage probability bounds, the system adopting the MPMA sequence family is shown to provide much smaller false-identification probability than the system adopting the Zadoff-Chu sequence family.


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    Titel :

    Random Access Preamble Detection in OFDM Systems Using Constant-Amplitude Sequences


    Beteiligte:
    Chen, Po-Jen (Autor:in) / Tseng, Yen-Chia (Autor:in) / Lu, Shih-Hao (Autor:in) / Chen, Wei-Chang (Autor:in) / Chung, Char-Dir (Autor:in)


    Erscheinungsdatum :

    07.10.2024


    Format / Umfang :

    801476 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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