Variance Analysis of a Hierarchical Decision-Directed Phase Detector for 16-QAM Constellation
نویسندگان
چکیده
In this paper we introduce and describe an optimized phase detector suited to 16-QAM receivers which prevents ambiguous locking and performs relatively rapid acquisition. Based on a new decision scheme, the proposed phase detector outperforms a classical decision directed phase detector over a Gaussian channel. An analytical analysis of the proposed phase detector variance is carried out and validated by means of computer simulation.
منابع مشابه
Decision directed channel estimation in 16-QAM on fading channels
A coherent detector for differentially encoded 16-QAM on Rayleigh fading channels is presented. An FIR-filter with previous received samples as input delivers an MMSE estimate of the fading process, providing the carrier reference needed for coherent detection. This estimation is assisted by previous decisions. The bit error performance of the proposed detector is analysed for the first-event b...
متن کاملA Polarity Decision Carrier Recovery Algorithm Using Selected Symbols for High Order QAM
In this letter, we propose a polarity decision carrier recovery algorithm that is useful for carrier acquisition in high order QAM. The PD (Phase Detector) output and its variance characteristic are mathematically derived and the simulation results are presented. The proposed algorithm shows enhanced acquisition performance especially for large frequency offset. key words: carrier recovery, QAM...
متن کاملPerformance Analysis of an Optimal Circular 16-QAM for Wavelet Based OFDM Systems
The BER performance for an optimal circular 16-QAM constellation is theoretically derived and applied in wavelet based OFDM system in additive white Gaussian noise channel. Signal point constellations have been discussed in much literature. An optimal circular 16-QAM is developed. The calculation of the BER is based on the four types of the decision boundaries. Each decision boundary is determi...
متن کاملKalman Filtering Applied to Carrier Recovery of High- Order Qam Signals
A carrier synchronization algorithm for high-order QAM modulated signals that uses Kalman filtering techniques shows fast acquisition times and good frequency tracking performances. The algorithm relies on a decision directed extended Kalman filter combined with a lock detector which determines the status of the synchronization process, modifying consequently the filter parameters. Simulations ...
متن کاملDevelopment and Implementation of Robust and Spectrally-eecient Medium Data Rate Modems Part 2: Synchronisation Algorithms
Synchronisation algorithms for carrier phase recovery and symbol timing in a medium-rate QAM modem are presented. Decision directed (DD) methods that use 1 sample per symbol period are presented. New results are presented to show the eeect of decision errors in the phase detector. The performance of phase and timing estimators is shown when both phase and time oosets are present, and loop conve...
متن کامل