Open AccessOn the Error Rate and Delay Performance Analysis of OFDM based Cooperative Protocol for 802.11 Networks
Author(s) -
Irfan Ahmed
Publication year - 2013
Publication title -
international journal of computer and technology
Language(s) - English
Resource type - Journals
ISSN - 2277-3061
DOI - 10.24297/ijct.v10i2.7001
Subject(s) - computer science , orthogonal frequency division multiplexing , retransmission , transmit diversity , network packet , fading , bit error rate , block code , computer network , algorithm , electronic engineering , channel (broadcasting) , engineering , decoding methods
We develop and analyze a distributed space-frequency block code-orthogonal frequency division multiplexing protocol for cooperative communications in 802.11 networks. Space frequency block codes (SFBC) are spread over OFDM subcarriers instead of OFDM symbols to compensate for the small coherence time. Medium access control (MAC) layer packet retransmission limit has been used as an actuator for transmit cooperative diversity initialization. Transmit diversity is provided by the relays in close proximity to source node. Closed form expressions are obtained for packet error rate (PER) and average delay for the proposed scheme in Nakagami-m fading channels. This cooperative scheme achieves lower signal-to-noise ratio (SNR) values for desired packet error rate and markedly improves the average delay per packet compared to the direct transmissions at low SNR regime. Finally, the results of computer simulations are included to demonstrate the efficacy of the proposed scheme and to verify the accuracy of analytical expressions.