Complex spreading sequences with a wide range of correlation properties

Oppermann, I.; Vucetic, Branka

doi:10.1109/26.558701

Cited by 141 publications

(125 citation statements)

References 12 publications

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“…It can be used instead of the figures of merit, which have to be calculated for the individual sequences. For DS CDMA applications we want both parameters R CC and R AC to be as low as possible Oppermann and Vucetic (1997). Because these parameters characterize the whole sets of spreading sequences, it is convenient to use them as the optimization criteria in the design of new sequence sets.…”

Section: W Al(0 T) W Al(7 T) W Al(3 T) W Al(4 T) W Al(1 T) W Al(mentioning

confidence: 99%

“…A similar measure, denoted by R AC was introduced in Oppermann and Vucetic (1997) for comparing the auto-correlation performance:…”

Section: W Al(0 T) W Al(7 T) W Al(3 T) W Al(4 T) W Al(1 T) W Al(mentioning

confidence: 99%

“…In order to evaluate the performance of a whole set of M spreading sequences, the average mean-square value of cross-correlation for all sequences in the set, denoted by R CC , was introduced by Oppermann and Vucetic (1997) as a measure of the set cross-correlation performance:…”

Section: W Al(0 T) W Al(7 T) W Al(3 T) W Al(4 T) W Al(1 T) W Al(mentioning

confidence: 99%

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On some applications of Hadamard matrices

Seberry

Wysocki

2005

Metrika

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Modern communications systems are heavily reliant on statistical techniques to recover information in the presence of noise and interference. One of the mathematical structures used to achieve this goal is Hadamard matrices. They are used in many different ways and some examples are given. This paper concentrates on code division multiple access systems where Hadamard matrices are used for user separation. Two older techniques from design and analysis of experiments which rely on similar processes are also included. We give a short bibliography (from the thousands produced by a google search) of applications of Hadamard matrices appearing since the paper of Hedayat and Wallis in 1978 and some applications in telecommunications. Disciplines Physical Sciences and Mathematics Publication DetailsThis article was originally published as Seberry, J, Wysocki, Bj and Wysocki, TA, On some applications of Hadamard matrices, Metrika, 62, (2005) Abstract Modern communications systems are heavily reliant on statistical techniques to recover information in the presence of noise and interference. One of the mathematical structures used to achieve this goal is Hadamard matrices. They are used in many different ways and some examples are given. This paper concentrates on code division multiple access systems where Hadamard matrices are used for user separation. Two older techniques from design and analysis of experiments which rely on similar processes are also included. We give a short bibliography (from the thousands produced by a google search) of applications of Hadamard matrices appearing since the paper of Hedayat and Wallis in 1978 and some applications in telecommunications.

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Section: W Al(0 T) W Al(7 T) W Al(3 T) W Al(4 T) W Al(1 T) W Al(mentioning

confidence: 99%

“…A similar measure, denoted by R AC was introduced in Oppermann and Vucetic (1997) for comparing the auto-correlation performance:…”

Section: W Al(0 T) W Al(7 T) W Al(3 T) W Al(4 T) W Al(1 T) W Al(mentioning

confidence: 99%

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On some applications of Hadamard matrices

Seberry

Wysocki

2005

Metrika

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“…The aperiodic cross-correlation functions (ACCF) of a pair of polyphase sequences u X and u Y are expressed in Eq. (4) [23]:…”

Section: Properties Of Sequencesmentioning

confidence: 99%

Safety-critical wireless sensor networks under a polyphase spreading sequences scenario

Goyal¹,

Singh²

2017

Turk J Elec Eng & Comp Sci

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Reliable communication is a vital issue for safety-and mission-critical wireless sensor network environments such as industrial monitoring, medical care, and battlefield surveillance. These networks require highly accurate and delay-intolerant wireless communications. Under such critical conditions, the chip sequences used in these networks become vulnerable because of channel impairments and other interferences, thereby significantly decreasing overall system performance. In this paper, polyphase sequences are employed at the physical layer of IEEE Standard 802.15.4 to enhance the communication reliability of wireless sensor networks. Through an extensive simulation, it is found that upon applying polyphase sequences, the chip errors are reduced to 2.94 × 10 −6 in comparison to 1.18 × 10 −5 of conventional binary sequences (PN sequences).

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“…In this paper we use previous results [4], [5] for a Binary Phase Shift Keying (BPSK) modulated Direct Sequence Spread Spectrum (DSSS) signal to investigate the impact an interfering transmission has on the Bit Error Rate (BER) experienced by an existing transmission for the 802.11 DSSS physical layer. Our results indicate that the DSSS physical layer is susceptible to jamming when hidden terminals are competing for channel access.…”

Section: Introductionmentioning

confidence: 99%

Hidden terminal jamming problems in IEEE 802.11 mobile ad hoc networks

Ware

Wysocki

Chicharo

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240)

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Abstract-This paper addresses recent experimental measurements from an IEEE 802.11 ad hoc network testbed, which indicate a strong signal strength dependence in the ability of a hidden terminal to gain access to the radio channel. We present analytical results investigating the 'hidden terminal jamming' ability of the IEEE 802.11 DSSS physical layer. Results indicate that in a hidden terminal topology, the presence of an interfering transmission with a signal strength marginally greater than the transmission currently being received will result in an intolerable increase in BER, effectively jamming the ongoing transmission. These results confirm previous experimental measurements which show that after a number of MAC layer timeout/retransmission periods, the original (weaker) connection is effectively prevented from gaining access to the channel.

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Complex spreading sequences with a wide range of correlation properties

Cited by 141 publications

References 12 publications

On some applications of Hadamard matrices

On some applications of Hadamard matrices

Safety-critical wireless sensor networks under a polyphase spreading sequences scenario

Hidden terminal jamming problems in IEEE 802.11 mobile ad hoc networks

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