This work aims at presenting simulation results of performance of various Tomlinson-Cercas-Hughes (TCH) codes, namely, TCH(16,6,2), TCH(32,6,6), TCH(64,7,13), TCH(128,9,27) and TCH(256,14,55)#1 for a land mobile satellite channel, where multipath fading and shadowing occur. Performance results are presented for two environments, a city and a highway. It is shown that, in a highway environment with a small elevation angle, TCH codes with low code ratio do not show significant advantage over TCH codes with greater code ratio for high bit error ratio (BER), mainly, for BER>10/sup -5/. For lower BER, the TCH codes with lower code ratio present the expected gain. These results are explained by the statistical properties of bits in error, such as error bursts size and intervals without errors, as a function of signal-noise ratio.

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Fading,Interval simulation technique,Markov model,Land mobile satellite channel,TCH codes

• Ciências Físicas - Ciências Naturais