A simplified polarity decision carrier recovery (CR) algorithm is proposed by using the characteristics of 4096-QAM constellation. The proposed scheme, which has the better tradeoff between the performance and the complexity by using a simplified polarity decision phase detector (PD), includes three working modes. The initial frequency offset estimator (IFOE) is firstly applied to estimate the frequency offset in open-loop mode, then the phase-frequency detector (PFD) tracks and compensates the small frequency error in closed-loop mode. A simple decision-directed (DD) PD is finally used for fine phase tracking. Compared with the conventional polarity decision PD, the polarity decision PD in our algorithm needs fewer multipliers, whereas the proposed algorithm can slightly accelerate the convergence speed and maintain the estimation performance. Results show that, the time required for loop convergence is less than 105 symbol periods within the range of the normalized frequency offset between −0.09 and 0.09 for 4096-QAM.
A Low-complexity and Flexible Implementation of Carrier Recovery for 4096-QAM Systems
01.08.2018
705677 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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