A channel decoding approach for non-coherent HIPERLAN receivers

HIPERLAN is an European standard for a high rate WLAN using as the modulation scheme differentially pre-coded GMSK. As a consequence the information is contained in the absolute phase of the transmitted signal. This implies the necessity for an integrator at the output of a non-coherent receiver leading to error propagation and making a subsequent decoding of the incorporated (31,26,3) BCH code mostly useless due to error propagation. We propose to use the integrator only after decoding the demodulator output. This is possible since the demodulator output signal will still consist of code words from the original code if a standard block interleaver and a linear code are used in the transmitter. However, this is the case for HIPERLAN.