This paper addresses the characterization of systems and devices via telemeasurement through heterogeneous networks. The methodology is generally valid and here applied to communication systems. Both dedicated circuits and DSP-based realizations are taken into account. In the last case the remote definition of the system is also considered. The software radio technology offers these advantages by means of digital signal processing techniques for which many functionalities are implemented via software with reduced cost with respect to hardware realizations. The example proposed in this paper uses a solution of remote downloading of small software files plus commands for transparent parameter setting. Possible system architecture for telemeasurement, developed in our laboratories, is proposed and described. It is useful for two typical situations: the case in which few valuable instruments and devices are available only in some particular laboratories, and the educational case where the number of instruments available is not sufficient with respect to the potential number of users. An integrated WEB server to manage both instruments and DSP platforms has been also developed. The measurement benchmark has been completely remote using a signal matrix; hence the presence of a human operator is no more needed. A complete remote measurement test-bed experience on a DSP-based CDMA satellite modem for satellite telecommunication systems is reported. Firstly a brief description of the hardware platform, the transmission chain and the code acquisition, tracking, offset recovery algorithms are presented. Secondly, the software architecture that performs the web-client access to control the instruments on the measurement benchmark and the reconfiguration by remote of the DSP-based modem are described. Finally, some numerical results in term of telemeasured Bit Error Rate with AWGN channel and telemeasured performances of Frequency Offset recovery algorithm in term of stability and convergence speed are given.
Telemeasured Performance of a DSP based CDMA Software Defined Radio
CONTI, Andrea;
2004
Abstract
This paper addresses the characterization of systems and devices via telemeasurement through heterogeneous networks. The methodology is generally valid and here applied to communication systems. Both dedicated circuits and DSP-based realizations are taken into account. In the last case the remote definition of the system is also considered. The software radio technology offers these advantages by means of digital signal processing techniques for which many functionalities are implemented via software with reduced cost with respect to hardware realizations. The example proposed in this paper uses a solution of remote downloading of small software files plus commands for transparent parameter setting. Possible system architecture for telemeasurement, developed in our laboratories, is proposed and described. It is useful for two typical situations: the case in which few valuable instruments and devices are available only in some particular laboratories, and the educational case where the number of instruments available is not sufficient with respect to the potential number of users. An integrated WEB server to manage both instruments and DSP platforms has been also developed. The measurement benchmark has been completely remote using a signal matrix; hence the presence of a human operator is no more needed. A complete remote measurement test-bed experience on a DSP-based CDMA satellite modem for satellite telecommunication systems is reported. Firstly a brief description of the hardware platform, the transmission chain and the code acquisition, tracking, offset recovery algorithms are presented. Secondly, the software architecture that performs the web-client access to control the instruments on the measurement benchmark and the reconfiguration by remote of the DSP-based modem are described. Finally, some numerical results in term of telemeasured Bit Error Rate with AWGN channel and telemeasured performances of Frequency Offset recovery algorithm in term of stability and convergence speed are given.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
