A transport-independent asynchronous RPC (remote procedure call) mechanism (ASTRA) that combines the advantages of both RPC and message-passing IPC (interprocess communication) has been designed and implemented. ASTRA calls do not block the caller (client) and the replies can be received as and when they are needed, thus allowing the client execution to proceed locally in parallel with the server invocation. All the calls are received and executed by the server in the order called by the client. ASTRA is unique among other asynchronous RPC systems in allowing its users to explicitly specify whether low-latency or high-throughput is required for a call, and in providing highly optimized lightweight intramachine calls. ASTRA is built within the framework of the SHILPA distributed computing environment.>

It is commonly known that, in order to calculate the demodulated noise power of the wanted frequency division multiplexedfrequency modulated (FDM-FM) signal due to interference, the convolution between the power spectra of the wanted FM signal and interference is required to be obtained. This concise paper shows a simple approach to calculate this convolution without direct calculation of the power spectrum of the FDMFM signal when the power spectrum of the interference is given (by measurements or calculation) and the highest and lowest channel frequencies of the baseband signal and rms frequency deviation of the wanted FDM-FM signal are known. Since the calculation of the FDM-FM signal power spectrum is not an easy problem in some cases, this approach makes much simpler an accurate evaluation of the output noise power due to interference.