An adaptive low-power receiver architecture for IEEE 802.15.4 standard

Santos, Maico Cassel dos; Carro, Luigi

doi:10.1109/i2mtc.2014.6860814

Cited by 2 publications

(5 citation statements)

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“…According to recent researches, the CCF‐based algorithms still have been used for accurate timing estimation [4, 6]. Therefore, in this simulation, we compare the performance of the SFD detection of both the proposed method and the conventional CCF method (Fig.…”

Section: Simulationmentioning

confidence: 99%

“…Thus, it is important to reduce the complexity of the synchronisation for low power consumption. According to previous works [2][3][4][5][6], the autocorrelation function (ACF) and the crosscorrelation function (CCF) have been utilised for synchronisation algorithms. The ACF-based algorithms measure signal similarity for periodically allocated identical signals in a preamble.…”

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confidence: 99%

“…Once a packet is detected, the receiver recovers information via demodulation, chip-to-symbol and symbol-to-bit mapping. To find the frame start, timing metrics have been introduced in [2][3][4][5][6]. The timing metrics are defined by correlation for the received signals.…”

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confidence: 99%

“…The number of computations for P CCF (m) is definitely larger than for P ACF (m), and also it increases the correlation length depending on the sampling rate N O . However, the conventional methods have been applying the CCF-based algorithm for estimation accuracy because the envelope of M CCF (m) is an impulse-like waveform at exact frame timing [3][4][5][6].…”

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confidence: 99%

“…where w =ê − r. Then the received packet is regarded as effective if symbols '7' and '10' are detected consecutively at k = 0, 1. Simulation: According to recent researches, the CCF-based algorithms still have been used for accurate timing estimation [4,6]. Therefore, in this simulation, we compare the performance of the SFD detection of both the proposed method and the conventional CCF method (Fig.…”

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Low‐complexity frame synchronisation method for IEEE 802.15.4 systems

et al. 2014

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A low-complexity frame synchronisation method for IEEE 802.15.4 systems is proposed. An autocorrelation function is utilised for reducing computational complexity for fine timing estimation instead of a cross-correlation function. To provide accurate estimation results, residual errors are compensated in the step of detecting start-offrame delimiter symbols. The complexity of the proposed method for fine timing estimation is <1/4 compared with the conventional crosscorrelation-based algorithm.Introduction: Low power consumption is a crucial aspect or requirement for wireless sensor communication systems such as those of IEEE 802.15.4 [1]. Particularly, in baseband processing, computational complexity is directly related to the power consumption [2]. Usually receivers detect desired packets using a frame synchronisation function that induces high computational complexity due to correlation of all incoming signals [3]. Thus, it is important to reduce the complexity of the synchronisation for low power consumption. According to previous works [2-6], the autocorrelation function (ACF) and the crosscorrelation function (CCF) have been utilised for synchronisation algorithms. The ACF-based algorithms measure signal similarity for periodically allocated identical signals in a preamble. The complexity of the ACF can be reduced by recursive calculation [2]. It means that the ACF computation is independent of the correlation length. However, the timing metric generates a plateau-shape envelope around correct frame timing. Because of the ambiguousness of the plateau, the timing metric cannot be used to decide accurate packet timing. Thus, the ACF has been just applicable to coarse timing estimation. Meanwhile, the CCF measures instantaneous signal energy between reference and incoming signals. The CCF produces an impulse-shape envelope at frame start timing, so the timing metric is available to fine timing estimation. However, number of CCF calculations depends on the correlation length. In this Letter, the ACF-based fine frame synchronisation method is proposed for direct sequence spread spectrum systems at the 2.4 GHz band [1]. Based on the characteristics of cyclic spreading sequences, a modified ACF algorithm is provided to find the transition timing from the preamble to start-of-frame delimiter (SFD). To guarantee estimation accuracy, an error compensation method is also provided. With the proposed method, the computational complexity of the fine timing estimation is significantly reduced by 1/4N O in comparison with the CCF, while performance degradation for frame detection is at most 0.5 dB under two-path Rayleigh fading channels.

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Section: Simulationmentioning

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confidence: 99%

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