V. Minkin, A. Voschinin

Radio Research & Telecommunication Institute (NIIR)

Received February 22, 2000

At present there are two concepts to evaluate the error performance parameters and objectives for digital radio-relay systems forming a part of SDH-network. The parameters and objectives for systems below the primary rate are defined in ITU-T Recommendation G.821 [1] while those for systems at or above the primary rate are specified in ITU-T Recommendation G.826 [2]. For the time being the design of radio-relay links at or above the primary rate was based on ITU-T Recommendation G.821 approach. For both design and maintenance of the digital links it is important to determine converting statistics and establish relations between error performance objectives according ITU-T Recommendations G.821 and G.826. In the present paper this problem is solved with asymptotic approach based on normal approximation to the binomial distribution. Under this, for time-invariant number of errors per burst and bit error ratio, BER(t), distribution, multipliers for converting parameters in accordance with Recommendation G.821 into parameters in accordance with Recommendation G.826 are found. For the complex case of time-variant characteristics the asymptotic method for predicting error performance parameters is developed. Proposed evaluating algorithm is numerically verified with estimation of block error performance parameters on a design of radio-relay hop. The BER(t) distribution mask that could allow meeting error performance objectives for a hop has been defined using different propagation and equipment parameters. 

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