Simplified matched filter receiver designs for spread spectrum communications applications

Abstract-This paper presents an architecture as well as circuit implementation of a ZigBee modulator/demodulator in the transceiver for personal area network, which is compliant with the physical layer of IEEE standard 802.15.4. A test prototype has been designed and fabricated using 0.18-m single-poly six-metal CMOS process with core area of 0.16 mm ¾ . The measurement results show that packet error rate (PER) is less than 1% given SNR = 5 dB. The total power consumption is merely 251 W at a 2.4 MHz system clock.Index Terms-ZigBee, matched filter, direct sequence spread spectrum, low power, wireless network.

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“…The time sync block utilizes the matched filter to estimate the correlation [10]. The detailed block diagram is shown as Fig.…”

Section: ) Time Syncmentioning

confidence: 99%

ZigBee 868/915-MHz Modulator/Demodulator for Wireless Personal Area Network

Wang

Huang

et al. 2008

IEEE Trans. VLSI Syst.

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“…Since the cross-correlation for synchronization should be carried out for very short time interval, T O = 1/f O , the SU should employ a passive correlator, called a matched filter, with the high complexity. The matched filter consists of a tapped delay line and coefficient registers that contain 32 code chip values of the PN sequence 0 [3]. The reference signal in the coefficient registers is cross-correlated with the received signal in a tapped delay line, which shifts the samples of received signal samples right at every T O .…”

Section: Synchronization and Demodulation Schemes For Ieee 802154 Lmentioning

confidence: 99%

Low complexity demodulation scheme for IEEE 802.15.4 LR-WPAN systems

Kim

Jung

Lee

et al. 2008

IEICE Electron. Express

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Abstract:In this paper, a low complexity demodulation scheme is proposed for IEEE 802.15.4 LR-WPAN systems. In the proposed scheme, multiple active correlators for demodulation are replaced with a matched filter-based cross-correlator shared with a synchronization unit, which requires only a few additional control units. Consequently, with the proposed demodulation scheme, the total hardware complexity for the LR-WPAN baseband modem is 54% less than that of the existing architecture to have the separated demodulation and synchronization units.

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“…Each frequency bin in the FFT produces data in 100 Hz frequency bins, with adjacent bins overlapped by 50 Hz. To further reduce losses [6], only the 16 center bins in the FFT are retained, covering ±400 Hz.…”

Section: Dirac Architecture Overviewmentioning

confidence: 99%

“…Simpler versions of the CMF bank design can be found in [6,7]. An advantage of the CMF bank design implemented in DirAc, as compared to other parallel cross-correlation methods (e.g.…”

Section: Cmf Bank Descriptionmentioning

confidence: 99%