Efficient Packet Loss Concealment for Narrowband Wireless VoIP System
نویسنده
چکیده
Internet Protocol is used as a communication platform for Voice over Internet Protocol (VoIP). Before the transmission of VoIP it is required to do signal processing for reliable & efficient performance over the computer and the communication platform.Speech quality is critically important to update the service. Signal quality gets deteriorated at network layer due to problems like delay, jitter or packet loss. The work presented in this paper analyzes the performance of the narrowband wireless VoIP system under varying packet loss for different modulations schemes such as DBPSK, DQPSK, and QAM64. The VoIP simulations are conducted for G.729A and AMR-NB speech coders at different packet loss rates in wireless environment. The signal quality of wireless VoIP system for different modulations is analyzed and it is observed that signal quality of the wireless VoIP system decreases as the packet loss increases. The significant improvement in the quality of VoIP speech signal can be achieved with the implementation of the Forward Error Correction (FEC) for various modulation schemes. The significant improvement in the quality of the narrowband wireless VoIP speech signal is observed for DBPSK modulation scheme with the proposed packet loss concealment scheme. Keywords-Narrowband VoIP, Packet Loss, FEC, Modulations
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