Constant-amplitude (CA) sequences are efficacious in the construction of multicarrier sounding waveforms in order to facilitate simultaneous channel estimation (SCE) in uplink multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The permissible single-root length-N Zadoff-Chu sequences that are cyclically shiftable with a minimum cyclic shift distance (CSD) ${\varpi _{{\text{min }}}}$ in time domain are widely adopted to enable the separation of simultaneously received sounding OFDM waveforms and thus achieve accurate SCE when at most $\left\lfloor {N/{\varpi _{\min }}} \right\rfloor $ MIMO channels are estimated simultaneously. To enable the large-size SCE of more than $\left\lfloor {N/{\varpi _{\min }}} \right\rfloor $ MIMO channels, nonorthogonal multiple-root Zadoff-Chu sequences have to be adopted and this degrades the SCE performance remarkably due to heavy inter-sequence interference (ISI). In this paper, various CA sequence families are thus investigated for performance prevalence in the large-size SCE over independent Rician multipath channels. It is analytically shown that the large-size SCE can be achieved with less influence from ISI when the adopted CA sequence family is composed of orthogonal sequence subfamilies, each containing as many permissible cyclically-shiftable CA sequences as possible.


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    Title :

    Simultaneous Channel Estimation in MIMO OFDM Systems Using Constant-Amplitude Sequences


    Contributors:


    Publication date :

    2023-10-10


    Size :

    1319152 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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