HCEM: A new class of bit-level hybrid channel error model

In this paper we present a bit-level hybrid channel error model (HCEM) to represent multipath fading wireless channels. Our model divides the received error marking sequences into blocks of different lengths. Within each block, bit errors occur according to the independent model with mean bit error rate e. We define p to be a threshold bit error rate and if the bit error rate of a block is not greater than p, we associate it with a benign block and vice versa. For any block being of length n, we compute the probability P_G it is a benign block and the probability P_B it is a malign block. Between blocks, we define a new class of two-state Markov channel model. It adopts a benign block state G and a malign block state B. We take P_G and P_B as approximate values of the steady-state probability of being a benign block state and a malign block state respectively. For an error marking sequence, we show basic principles of choosing suited model parameters: (n, p, e) in theory. We set up an office wireless environment and show how to choose optimum model parameters: (n, p, e) based on data.