engleski

Residual Block Error Rate Prediction for IR HARQ Protocol

In this paper, we derive a simple prediction of the Long Term Evolution (LTE) physical and Medium Access Control (MAC) layer peak transmission performance – the irreducible Block Error Rate (BLER) that determines the Hybrid Automatic Repeat Request (HARQ) residual channel available to higher-layer protocols. With this regard, the general pre-HARQ BLER prediction is developed for the redundancy version 0 (RV0) codeword transmission, as a function of the Bit Error Rate BER), considering the cyclic prefix protection against inter-symbol interference sufficient to prevent long error bursts. This implies only sporadic bit error occurrences, exhibiting moderate mutual interdependence that we modeled considering erroneous bits within a data block as a sample without replacement and consequently describing it with the hypergeometric rather than common binomial distribution. The HARQ BLER prediction model is validated by both problem- specific Monte-Carlo simulations and industry- standard LTE software simulation tool, specifically under LTE FDD downlink channel conditions, as the test results exhibit excellent matching with the residual BLER prediction.

BER ; BLER ; HARQ ; OFDM

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