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With the increasing demand of multimedia services over internet and local area networks, techniques to provide better data rate, low latency and low packet loss have also emerged. For this reason, IEEE has introduced a standard for local area networks known as IEEE 802.11e. In this paper, we provide a comparative analysis of basic and new standard in terms of medium access technique and management...
The relationship among the peak-to-average power ratio (PAPR), aperiodic autocorrelation co-efficient and power variance (PV) is discussed. We show that low values of PV do not always correspond to low values of PAPR as has been mentioned in literature. Hence PV cannot be used as a basis for comparison and measure of PAPR for OFDM signals. Further through simulations we assert that PV can be a good...
Aperiodic autocorrelation and power variance are two parameters that play an important role in PAPR reduction in OFDM symbols. In this paper, we have tackled the aperiodic autocorrelation factor and based on it, two algorithms have been proposed. In the first algorithm, called selective autocorrelation (SA), the value of first aperiodic autocorrelation coefficient is minimized to 1 for reducing the...
Selected mapping is an efficient algorithm for PAPR reduction in multicarrier systems. Two major issues in this technique are the side information and complexity of the implementation in terms of the number of IF FT blocks being used. Our proposed algorithm deals with the complexity issue. The new algorithm called sub-SLM algorithm divides the OFDM sequence into multiple equal length sequences then...
In this paper, the expression of the power variance (PV) of an OFDM symbol has been explored for peak to average power ratio (PAPR) reduction. It is seen through simulation results and complementary cumulative distribution function (CCDF) curves that PV expression used in PAPR comparison can be simplified to a point where it becomes practical to use such a computationally complex PV expression for...
Three new algorithms based on minimization of autocorrelation of transmitted symbols and the SLM approach which are computationally less demanding have been proposed. In the first algorithm, autocorrelation of complex data sequence is minimized to a value of 1 that results in reduction of PAPR. Second algorithm generates multiple random sequences from the sequence generated in the first algorithm...
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