Wireless cyclically permutable code based EMG system for assistive devices.

摘要

The problem of transmitting an EMG (Electromyogram) on a wireless channel, in a multi-user environment, is addressed in this thesis. The use of CPCs (Cyclically Permutable Codes) as channel accessing protocol sequences is investigated as a solution. The main objective is to design a CPC such that, when it is used as a multiple access protocol with asynchronous users and without feedback, reliable communications is possible. Furthermore, the CPC must be suitable for the intended application, which requires the transmission of measured EMG for communications with and control of assistive devices. Comparison of nine families of CPCs, as well as results from a programmed microcontroller using a CPC, will demonstrate that they are an effective solution to the problem. A secondary objective is to illustrate the feasibility of using CPCs in a system solution to the problem. This will be demonstrated by the specification of all relevant communications parameters of a myoelectric transceiver system. The CPC that is used in the system, is a CPC ( N = 272, Mc = 17, dc = 28) which are respectively the length, family size and cyclic Hamming distance of the code.