Zero-crossing Demodulation for the Bluetooth Enhanced Data Rate Mode

T. Scholand, C. Spiegel, A. Waadt, A. Burnic, and P. Jung (Germany)


π/4-Shifted Differential Quadrature Phase Shift Keying (π/4-DQPSK), Bluetooth, Bluetooth Enhanced Data Rate (EDR), Differential Phase Shift Keying (DPSK), Digital Signal Processor (DSP), Octal Differential Phase Shift Keying (8-DPSK), Zero-Crossing Demodulation


Short range communication systems such as Bluetooth and DECT (Digital Enhanced Cordless Telecommunications) require low-cost transceiver structures. Hence, the development of appropriate receiver techniques has been a major research topic. Particularly, analog limiter-discriminator with integrate and dump filtering (LDI) techniques have received considerable attention. With the availability of digital signal processing (DSP), the digital implementation of LDI techniques has become increasingly attractive. In order to make LDI receivers more accessible, zero crossing detection was proposed. In this communication, the authors shall focus on a novel, yet promising, approach to digital zero-crossing detection in the intermediate frequency domain. Zero-crossing demodulation is an irregular sampling technique, which replaces the commonly employed regular, i.e. temporally equidistant sampling technique in the mentioned low-cost receivers. In this manuscript, the authors will present the theoretical aspects of zero-crossing demodulation with special focus on Bluetooth Enhanced Data Rate (EDR). Next, the obtained performance results in terms of the bit error ratio (BER). Comparisons with theoretical bounds show the advantageous performance. Furthermore, a demonstrator concept termed HAWK shall be discussed and first measurement results will be presented.

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