Principles of Spread-Spectrum Communication Systems

Torrieri, Don

doi:10.1007/978-3-319-14096-4

Cited by 61 publications

(44 citation statements)

References 78 publications

(236 reference statements)

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“…The propagation model comprises models for the area-mean power, the local-mean power, and the fading [18]. The area-mean power, which is the average received power in the network region, is a function of the distance d between a source and destination.…”

Section: B Propagation Modelmentioning

confidence: 99%

“…Frequency hopping [18] may be used in SC-FDMA uplink systems to provide the diversity that will mitigate the effects of frequency-selective fading and intersector interference. Because of network synchronization and similar propagation delays for the mobiles associated with a cell sector, synchronous orthogonal frequency-hopping patterns can be allocated so that at any given instant in time, there is no intrasector interference.…”

Section: Frequency Hopping and Intersector Interferencementioning

confidence: 99%

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Analysis of a Frequency-Hopping Millimeter-Wave Cellular Uplink

Torrieri

Talarico

Valenti

2016

IEEE Trans. Wireless Commun.

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Fifth-generation (5G) cellular networks are expected to exhibit at least three primary physical-layer differences relative to fourth-generation ones: millimeter-wave propagation, massive antenna arrays, and densification of base stations. As in fourth-generation systems, such as LTE, 5G systems are likely to continue to use single-carrier frequencydivision multiple-access (SC-FDMA) on the uplink due to its advantageous peak-toaverage power ratio. Moreover, 5G systems are likely to use frequency hopping on the uplink to help randomize interference and provide diversity against frequency-selective fading. In this paper, the implications of these and other physical-layer features on uplink performance are assessed using a novel millimeter-wave propagation model featuring distance-dependent parameters that characterize the path-loss, shadowing, and fading. The analysis proceeds by first fixing the location of the mobile devices and finding the performance conditioned on the topology. The spatially averaged performance is then found by averaging with respect to the location of the mobile devices. The analysis allows for the use of actual base-station topologies and the propagation model can leverage empirical millimeter-wave measurements. The benefits of base-station densification, highly directional sectorization, frequency hopping, a large available bandwidth, and a high code rate are illustrated. The minor importance of fractional power control is shown.

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Section: B Propagation Modelmentioning

confidence: 99%

Section: Frequency Hopping and Intersector Interferencementioning

confidence: 99%

Analysis of a Frequency-Hopping Millimeter-Wave Cellular Uplink

Torrieri

Talarico

Valenti

2016

IEEE Trans. Wireless Commun.

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“…These restrictions are imposed in order to maintain orthogonality. Also, there are fixed and variable length modified Walsh-Hadamard codes that exhibit improved correlation properties which make them suitable for asynchronous DS-CDMA communication [5].…”

Section: Introductionmentioning

confidence: 99%

“…Majority of these spreading sequences make use of linear feedback shift registers (LFSR) to implement the primitive polynomials [3][4][5][6][7]. But the number of code sets generated by the primitive polynomial is limited.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of New Binary User Codes for DS-CDMA Communication

Usha¹,

Sankar²

2014

J. Inst. Eng. India Ser. B

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This paper analyzes new binary spreading codes through correlation properties and also presents their performance over additive white Gaussian noise (AWGN) channel. The proposed codes are constructed using gray and inverse gray codes. In this paper, a n-bit gray code appended by its n-bit inverse gray code to construct the 2n-length binary user codes are discussed. Like Walsh codes, these binary user codes are available in sizes of power of two and additionally code sets of length 6 and their even multiples are also available. The simple construction technique and generation of code sets of different sizes are the salient features of the proposed codes. Walsh codes and gold codes are considered for comparison in this paper as these are popularly used for synchronous and asynchronous multi user communications respectively. In the current work the auto and cross correlation properties of the proposed codes are compared with those of Walsh codes and gold codes. Performance of the proposed binary user codes for both synchronous and asynchronous direct sequence CDMA communication over AWGN channel is also discussed in this paper. The proposed binary user codes are found to be suitable for both synchronous and asynchronous DS-CDMA communication.

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2016

Cyber‐Assurance for the Internet of Things

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Principles of Spread-Spectrum Communication Systems

Cited by 61 publications

References 78 publications

Analysis of a Frequency-Hopping Millimeter-Wave Cellular Uplink

Analysis of a Frequency-Hopping Millimeter-Wave Cellular Uplink

Performance Analysis of New Binary User Codes for DS-CDMA Communication

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