Design of a search and rescue terminal based on the dual-mode satellite and CDMA network

Zhao, Jianhui; Zhang, Xuan; Zheng, Bing; Zhou, Yifang; Song, Hao; Song, Wei; Zhang, Meikui; Liu, Tongze; Zhou, Li

doi:10.1007/s11433-010-4177-9

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…A Fourier transform could make signals into the frequency domain. Frequency correlation directly searches for the nearest peak and ignores unaligned symbols [4,5]. Differently, fast Fourier transform increases the computational complexity of the methods in the devices, which require an appropriate balance for optimum estimation.…”

Section: Introductionmentioning

confidence: 99%

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

Liu

Deng

2017

Automatika

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Remote control technology has greatly expanded the intelligence and automation of industry. Satellite signals are important to keep in contact with the facilities and devices in remote areas. However, satellite channels suffer from multi-scale attenuation to achieve reliable communications, which cannot provide sufficient accuracy and suitable complexity for the frequency-offset estimation of a weak signal. Therefore, this paper focused on a frequency-offset estimation method for a weak signal from a distant, poor satellite channel. First, we built a model of a distant satellite channel with mirror power reflection, considering large fading and multi-path fading simultaneously. Second, we described M-Walsh pilots and a signal vector matrix as they relate to satellite signals. Initially, we analysed the performance of different frequency-offset estimation methods in the satellite environment as opposed to the ground environment. We proposed compact M-Walsh pilots locking correlation to improve the estimation accuracy, which enhanced the frequency tracking. We further proposed equivalent weighting estimation allocation to help improve the balance of accuracy and complexity in the algorithm. Simulations and tests demonstrated that the new algorithm enhanced the root-mean-square-error frequency-offset estimate by 36.2% and the bit-to-error rate) performance by 29.5%.

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Section: Introductionmentioning

confidence: 99%

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

Liu

Deng

2017

Automatika

View full text Add to dashboard Cite

show abstract

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

Liu

Deng

2017

Automatika

View full text Add to dashboard Cite

Remote control technology has greatly expanded the intelligence and automation of industry. Satellite signals are important to keep in contact with the facilities and devices in remote areas. However, satellite channels suffer from multi-scale attenuation to achieve reliable communications, which cannot provide sufficient accuracy and suitable complexity for the frequency-offset estimation of a weak signal. Therefore, this paper focused on a frequency-offset estimation method for a weak signal from a distant, poor satellite channel. First, we built a model of a distant satellite channel with mirror power reflection, considering large fading and multi-path fading simultaneously. Second, we described M-Walsh pilots and a signal vector matrix as they relate to satellite signals. Initially, we analysed the performance of different frequency-offset estimation methods in the satellite environment as opposed to the ground environment. We proposed compact M-Walsh pilots locking correlation to improve the estimation accuracy, which enhanced the frequency tracking. We further proposed equivalent weighting estimation allocation to help improve the balance of accuracy and complexity in the algorithm. Simulations and tests demonstrated that the new algorithm enhanced the RMS (root mean square error) frequency-offset estimate by 36.2% and the Bit to Error Rate performance by 29.5%.

show abstract

Design of a search and rescue terminal based on the dual-mode satellite and CDMA network

Cited by 2 publications

References 5 publications

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

A frequency-offset estimation algorithm combines code and time features for the remote reception of a weak satellite signal

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