High-performance 802.11a wireless LAN via carrier-interferometry orthogonal frequency division multiplexing at 5 GHz

Wiegandt, D.A.; Nassar, C.R.

doi:10.1109/glocom.2001.966348

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…The performance can be improved with adaptive spreading code selection [11] to minimize the loss of orthogonality. A novel orthogonal complex spreading code referred as Carrier Interferometry (CI) [13]- [16] code has been well studied in OFDM and MC-CDMA system. It has been stated in recent literature that CI based OFDM (CI-OFDM) and CI based MC-CDMA (CI/MC-CDMA) provide better performance and better Peak to Average Power Ratio (PAPR) property as compared to conventional OFDM and MC-CDMA systems.…”

Section: Introductionmentioning

confidence: 99%

A study on Non-contiguous Carrier Interferometry code for Cognitive Radio

Mukherjee

Kumar

Matam

2015

2015 International Conference on Communications, Signal Processing, and Their Applications (ICCSPA'15)

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Non-contiguous Carrier Interferometry (NC-CI) signature waveforms have been proposed for Dynamic Spectrum Access (DSA) and Cognitive Radio (CR) system in the literature. Walsh-Hadamard (WH) codes cannot ensure orthogonality for non-contiguous carrier allocation, when the number of noncontiguous carrier is not a multiple of 4. In literature, NC-CI and binary orthogonal codes of any code length are proposed for non-contiguous spectrum allocation. In this paper the crosscorrelation properties of NC-CI signature waveforms for noncontiguous CI orthogonal frequency division multiplexing (NC-CI/OFDM) and NC-CI multicarrier code division multiple access (NC-CI/MC-CDMA) have been evaluated through simulation and analysis over AWGN channel. Time domain NC-CI waveforms have also been examined for non-contiguous allocation. Crosscorrelation analysis and time domain waveforms show that NC-CI codes maintain orthogonality over non-contiguous subcarrier allocation in single user and multiuser environments. For WH code, it has been shown that orthogonality can be maintained with a loss of data rate.

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Section: Introductionmentioning

confidence: 99%

A study on Non-contiguous Carrier Interferometry code for Cognitive Radio

Mukherjee

Kumar

Matam

2015

2015 International Conference on Communications, Signal Processing, and Their Applications (ICCSPA'15)

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“…Specifically, we use a technique referred to as the Carrier Interferometry (CI) Approach [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] to create multi-carrier implementations of TDMA and DS-CDMA. At the heart of our CI Approach is the CI signal: a multi-carrier signal in that it is composed of multiple narrowband carriers (allowing it to be resolved into its frequency components).…”

Section: Introductionmentioning

confidence: 99%

Multi‐carrier platform for wireless communications. Part 1: High‐performance, high‐throughput TDMA and DS‐CDMA via multi‐carrier implementations

Nassar¹,

Natarajan²,

Wu³

2002

Wireless Communications

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Multi-carrier technologies in general, and OFDM and MC-CDMA in particular, are quickly becoming an integral part of the wireless landscape. In this first of a two-part survey, the authors present the innovative transmit/receive multi-carrier implementation of TDMA and DS-CDMA systems. Specifically, at the transmit side, the pulse shape (in TDMA) and the chip shape (in DS-CDMA) corresponds to a linear combining of in-phase harmonics (called a CI signal). At the receiver side, traditional time-domain processing (equalization in TDMA and RAKE reception in DS-CDMA) is replaced by innovative frequency based processing. Here, receivers decompose pulse (or chip) shapes into carrier subcomponents and recombine these in a manner achieving both high frequency diversity gain and low MAI. The resulting system outperforms traditional TDMA and DS-CDMA systems by 10-14 dB at typical BERs, and, by application of pseudo-orthogonal pulse shapes (chip shapes), is able to double system throughput while maintaining performance gains of up to 8 dB.

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“…In this work, we apply the CI approach to existing OFDM architectures and create a novel OFDM system, one enabling OFDM to overcome its limitations [25][26][27][28][29][30][31]. This architecture, referred to as Carrier Interferometry OFDM (or CI/OFDM for short), utilizes frequency diversity to increase OFDM performance without bandwidth expansion and without decreased data rate.…”

Section: Introductionmentioning

confidence: 99%

Multi‐carrier platform for wireless communications. Part 2: OFDM and MC‐CDMA systems with high‐performance, high‐throughput via innovations in spreading

Nassar

Natarajan

Wiegandt

et al. 2002

Wireless Communications

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Multi-carrier technologies in general, and OFDM and MC-CDMA in particular, are an integral part of the wireless landscape. In this second part of a two-part survey, the authors present an innovative set of spreading codes known as CI codes, and demonstrate how these significantly increase performance and capacity in OFDM and MC-CDMA systems, all the while eliminating PAPR concerns. Regarding OFDM: the spreading of each symbol over all N carriers using CI spreading codes (replacing the current one symbol per carrier strategy) are presented. CI codes are ideally suited for spreading OFDM since, when compared to traditional OFDM, CI-based OFDM systems achieve the performance of coded OFDM (COFDM) while maintaining the throughput of uncoded OFDM, and, at the same time, eliminate PAPR concerns. When applied to MC-CDMA, CI codes provide a simple means of supporting 2N users on N carriers while maintaining the performance of an N -user Hadamard Walsh code MC-CDMA system, i.e., CI codes double MC-CDMA network capacity without loss in performance. The CI codes used in OFDM and MC-CDMA systems are directly related to the CI pulse (chip) shapes used to enhance TDMA and DS-CDMA (see part 1): hence, the CI approach provides a common hardware platform for today's multi-carrier/multiple-access technologies, enabling software radio applications.

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High-performance 802.11a wireless LAN via carrier-interferometry orthogonal frequency division multiplexing at 5 GHz

Cited by 9 publications

References 4 publications

A study on Non-contiguous Carrier Interferometry code for Cognitive Radio

A study on Non-contiguous Carrier Interferometry code for Cognitive Radio

Multi‐carrier platform for wireless communications. Part 1: High‐performance, high‐throughput TDMA and DS‐CDMA via multi‐carrier implementations

Multi‐carrier platform for wireless communications. Part 2: OFDM and MC‐CDMA systems with high‐performance, high‐throughput via innovations in spreading

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