Fundamentals of Spread Spectrum Modulation

Ziemer, Rodger E.

doi:10.2200/s00096ed1v01y200708com003

Cited by 13 publications

(10 citation statements)

References 6 publications

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“…As the name already implies, the spectrum of the signal is spread over a broader bandwidth. There are two main types of spread spectrum modulation schemes (Ziemer, 2007):…”

Section: International Astronautical Congress 2008 Glasgowmentioning

confidence: 99%

“…The two can also be combined into a hybrid modulation technique, but according to Ziemer (2007) there is no need to increase the complexity by doing this, except when resistance to jamming is important. Both techniques have in common that they employ a pseudo-random code to spread the signal equally over the available bandwidth.…”

Section: International Astronautical Congress 2008 Glasgowmentioning

confidence: 99%

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Towards the next generation of nanosatellite communication systems

Milliano

Verhoeven

2010

Acta Astronautica

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The communication systems currently used on nanosatellites are usually well-proven commercial-off-the-shelf units with data rates up to 9.6 kbps. A careful analysis shows that by using advancements in microelectronics, a higher communication performance can be achieved, even within the power and mass limitations of a nanosatellite.This paper presents a new approach to maximize the performance of nanosatellite communication systems by taking a systems engineer's perspective and by regarding the entire satellite instead of the communication system only. It is found that efficiency can be gained by also including the electrical power system in the design. The parameters that influence the performance of the communication system are identified. It is shown how these parameters can be tuned such that the limited resources on a nanosatellite are used most effectively.The results are used in designing the communication system of Delfi-n3Xt, the next nanosatellite mission of Delft University of Technology. The results presented in the paper can be used as a guideline to designing a nanosatellite of the next generation.

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“…As the name already implies, the spectrum of the signal is spread over a broader bandwidth. There are two main types of spread spectrum modulation schemes (Ziemer, 2007):…”

Section: International Astronautical Congress 2008 Glasgowmentioning

confidence: 99%

Section: International Astronautical Congress 2008 Glasgowmentioning

confidence: 99%

Towards the next generation of nanosatellite communication systems

Milliano

Verhoeven

2010

Acta Astronautica

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“…For the SMPS with the proposed PWM strategy, the harmonic spectrum is spread with decreased amplitude, the input and output voltage ripples contain the data, and the data can be transmitted along the DC power line. By introducing the code division multiple access (CDMA) [27,28] concept, fullduplex multiple access communication among SMPSs can be realised. Compared with other PLC techniques, the proposed modulation strategy integrates communication with the SMPS and no additional signal generation hardware is required.…”

mentioning

confidence: 99%

Direct Sequence Spread Spectrum-Based PWM Strategy for Harmonic Reduction and Communication

Wang

Lin

et al. 2017

IEEE Trans. Power Electron.

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Switched mode power supplies (SMPSs) are essential components in many applications, and electromagnetic interference is an important consideration in the SMPS design. Spread spectrum based PWM strategies have been used in SMPS designs to reduce the switching harmonics. This paper proposes a novel method to integrate a communication function into spread spectrum based PWM strategy without extra hardware costs. Direct sequence spread spectrum (DSSS) and phase shift keying (PSK) data modulation are employed to the PWM of the SMPS, so that it has reduced switching harmonics and the input and output power line voltage ripples contain data. A data demodulation algorithm has been developed for receivers, and code division multiple access (CDMA) concept is employed as communication method for a system with multiple SMPSs. The proposed method has been implemented in both Buck and Boost converters. The experimental results validated the proposed DSSS based PWM strategy for both harmonic reduction and communication.

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“…The spread spectrum technique is widely adopted in wireless communications, where the energy generated in a particular bandwidth is deliberately spread in a wider frequency range [92]. The resultant transmission bandwidth is independent of the bandwidth of the modulating signal.…”

Section: Overview Of Ssmmentioning

confidence: 99%

“…In contrast to the slow frequency hopping, the hopping frequency band can change many times per carrier period. However, the hopping loss for this method is severe [92].…”

Section: Overview Of Ssmmentioning

confidence: 99%

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

Jin¹

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Class D amplifiers are found in nearly all portable electronic products for their small size and power efficiency. Due to their high frequency switching operation, they generate significant amount of electromagnetic interference (EMI) and usually offchip filters are necessary in order for them to comply with the international regulatory EMI limits. With the continuous trend of product miniaturization, filterless Class D amplifiers are gaining attention recently. Without the off-chip filter, designing a fully integrated filter-less Class D amplifier to meet the EMI requirements can be challenging. This thesis develops and implements a pseudo-randomized carrier frequency modulation (PRCFM) technique in both analog and digital filterless Class D audio power amplifiers for EMI mitigation purposes so that these amplifiers fulfill the electromagnetic compatibility (EMC) requirement without the needs of off-chip filters. The PRCFM circuit is implemented with a frequency divider and a linear feedback shift register (LFSR). The proposed amplifier also features a peak detector to improve the power conversion efficiency when it operates under low audio input condition. An analog filter-less Class D amplifier is designed and fabricated using 0.18 µm CMOS process technology with a size of 1 mm 2 and the proposed PRCFM circuit occupies only less than 1% of the total chip area. The effectiveness of the PRCFM VCO Voltage Controlled Oscillator

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Fundamentals of Spread Spectrum Modulation

Cited by 13 publications

References 6 publications

Towards the next generation of nanosatellite communication systems

Towards the next generation of nanosatellite communication systems

Direct Sequence Spread Spectrum-Based PWM Strategy for Harmonic Reduction and Communication

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

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