Performance of the audio signals transmission over wireless networks with the channel interleaving considerations

Abstract

This article studies a vital issue in wireless communications, which is the transmission of audio signals over wireless networks. It presents a novel interleaver scheme for protection against error bursts and reduction the packet loss of the audio signals. The proposed technique in the article is the chaotic interleaver; it is based on chaotic Baker map. It is used as a randomizing data tool to improve the quality of the audio over the mobile communications channels. A comparison study between the proposed chaotic interleaving scheme and the traditional block and convolutional interleaving schemes for audio transmission over uncorrelated and correlated fading channels is presented. The simulation results show the superiority of the proposed chaotic interleaving scheme over the traditional schemes. The simulation results also reveal that the proposed chaotic interleaver improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Figure 9 Received audio signal of file-1 waveform over a correlated fading channel (V c = 10 mile/h) at SNR = 20 dB. (a) No interleaving. (b) Bit-level interleaving. (c) Convolutional interleaving.

Lower Complexity of Secured WSN Networks

“…In the case of identical row and column dimensions, the distance between two adjacent bits of the input bitstream in the interleaved data with length L would be ffiffiffi L p . Although the generated distance is relatively high, in some special cases of turbo code applications, it will not provide sufficiently interleaved data for the second RSC encoder [28,29]. Figure 6.7 shows the block interleaver behavior with square matrix 8 Â 8, the figure clears the one dimensional burst error and two dimensional burst error.…”

Analytical modeling and analysis of interleaving on correlated wireless channels

“…The performance of the proposed scheme has been evaluated using the computer simulations. An optimal interleaving scheme for transmission of audio information over the wireless channels has been developed in [8]. The simulation approach has been chosen for performance assessment.…”

“…For a Markov chain defined in (7)- (8) we are interested in the probability of absorption in no more than I steps. We compute it as follows.…”

“…In order to demonstrate the effect of different interleaving depths we need to keep the packet size constant. We keep the product vI constant by choosing the following pairs of (I, v): (1, 16), (2,8), (4,4), (8,2), (16, 1). With this choice of (I, v) the whole packet size (including all headers) is always 63×16 = 1008 bits (126 bytes).…”

“…9 compares the throughput of several codes with increasing correction capabilities for few values of (I, v) and c. Depending on the lag-1 NACF value different codes need to be used across the considered range of BER. For example, for (2,8) scheme and c = 0.6, going from p E = 0.0001 to p E = 0.02 we need to change five difference codes. When c goes up to 0.9 the choice of the code becomes simpler as (63, 56, 1) is the best over the (0.0001 − 0.01) range of BER while (63, 36, 5) is the best for (0.01 − 0.02) range.…”