Specification for Digital Channel Selection Filters in a Bluetooth Capable HiperLAN/2 Receiver

In this paper we first briefly describe how the analog part of the channel selection function for a HiperLAN/2 receiver can be used as part of the channel selection function for a Bluetooth receiver. Thereafter we proceed to specify the overall requirements for the Bluetooth channel selection function. Part of these requirements are fulfilled by analog signal conditioning, part by digital processing. In order to assess the effects of analog processing early in the design process, we use a MAPLE model to assess the effect of analog filtering and sampling on a worst-case test signal. This test signal consists of the signal of the wanted channel and all possible worst-case interfering signals that, according to the standard, the system must be able to sustain. These interfering signals are not offered all at once, but one per BER-test. By interpreting results, we use the worst-case test signal to determine the cutoff frequency and order of the analog lowpass filter; the sampling frequency and resolution of the ADC and, finally the requirements for the digital channel selection filters.