ECG signal tele-monitoring that uses WLAN has been investigated and developed in recent years in order to enhance the efficiency of cardiovascular disease treatment and monitoring. However, there are several problems that may occur during the ECG signal transmission-receiving process, including bit errors and data packet loss. The causes of such problems include obstructions signal weakening due to far distances, larger number of users accessing the network at the same time, the presence of different WiFi networks operating at the same frequencies as that of ECG-WLAN and especially transmitted data packet sizes, of which significant changes will result in data loss on the transmission line. ECG signal compressing before transmitting is, therefore, critical. A two-state ECG compression algorithm has been proposed by the same group of authors in [1] and [2]. This paper describes the experiment and evaluation of the efficiency of the proposed WLAN-based two-state ECG compression algorithm. ECG data used in this experiment was from an arrhythmia ECG database. The results of experiment were evaluated by comparing some parameters such as packet error rate-PER, signal throughput, percentage of RMS difference (PRD), PRD Normalized (PRDN) and time delay between compressed and uncompressed signals and showed that the two-state compression algorithm helped to improve efficacy in ECG signal- WLAN transmission.
Keyword
Two-state ECG compression, packet error, throughput, Wireless LAN, ECG data
