Abstract
In this paper, a new method has been proposed to eliminate the intersymbol interference (ISI) and interchannel interference (ICI) for discrete multitone/orthogonal frequency division multiplexing (DMT/OFDM) systems by considering Time to Live (TTL) of multipath channel fading, especially for wireless medical application. In this method, the existence time of the packet is considered as the maximum propagation time and when the packet is sent to the receiver, the down count of the TTL starts. The existence of the packet in a network depends on TTL in an Internet Protocol (IP) packet that tells a network router whether or not the packet has been in the network too long and should be discarded. The proposed structure prevents ICI with a preprocessing method that utilizes a particular time that is equal to the continuation time of the packet and removes ISI by canceling the replica at the receiver. The simulation results show that the proposed method reduces the BER/ISI better under mutipath fading environment than other existing system.
Highlights
Multipath fading channel is an imperative aspect for wireless communication, especially for biological data transmission
Time-to-Live (TTL) is a value in an Internet Protocol (IP) packet that tells a network router whether or not the packet has been in the network too long and should y[m] = h[m]x[m]+w[m]
In telecommunication the fading channel/multipath propagation is the main reason for Intersymbol Interference (ISI)
Summary
Multipath fading channel is an imperative aspect for wireless communication, especially for biological data transmission. Yun Hee Kim et al analyzed the combined influence of the interchannel and intersymbol interferences, which result from the time variation and delay spread of mobile channels, on the performance of an orthogonal frequency-division multiplexing (OFDM) system [4]. Noriyoshi Suzuki et al proposed a new OFDM demodulation method in order to reduce the influence of the ISI and improved the bit error performance in the presence of multipath whose excess delays are longer than the Guard Interval [6]. Still the ISI and ICI tendency is being appeared in the existing work In this method, the existence time of the packet is equal to the maximum propagation time and when the packet is sent to the receiver, the down count of the TTL starts. If the TTL is set in the OFDM symbol less than 25ms, after 25ms the replicas of all symbols will be discarded and no ISI will be happen.
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