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- IEEE 802.11a Standard White Paper
- This paper provides overview of IEEE 802.11 standard. IEEE 802.11 standard specifies a 2.4 GHz operating frequency with data rates of 1 and 2 Mbps using either Direct Sequence Spread Spectrum DSSS or Frequency Hopping Spread Spectrum FHSS.
- Tags: IEEE 802.11, Wireless LANs, Wi-Fi, Wireless
- White papers 2003-09-04
- IEEE 802.11b
- IEEE 802.11 specifies a 2.4 GHz operating frequency with data rates of 1 and 2 Mbps using either Direct Sequence Spread Spectrum DSSS or Frequency Hopping Spread Spectrum FHSS. This white paper starts with introduction to IEEE 802.11b and then describes CCK used in IEEE 802.11b, Walsh and Complementary Codes...
- Tags: IEEE 802.11, Wireless LANs, Wi-Fi, Wireless
- White papers 2003-10-23
- Scale-Lag Diversity Reception in Mobile Wideband Channels
- This paper considers the effect of mobility on a wideband Direct Sequence Spread Spectrum DSSS communication system, and study a scale-lag Rake receiver capable of leveraging the diversity that results from mobility. A wideband signal has a large bandwidth-to center frequency ratio, such that the typical narrowband Doppler spread assumptions...
- Tags: UWB, Channel, Mobile, Radio Frequency, Ohio State University, Ultrawideband (UWB), Advertising & Promotion, Network Technology, Wireless, Marketing, Networking
- White papers
- Frequency Shift Based Multiuser Canceller for DS-CDMA Systems
- The cyclostationary properties of Direct Sequence Spread Spectrum signals are well known. These cyclostationary properties imply a redundancy between frequency components separated by multiples of the symbol rate. This paper presents a Multiple Access Interference Canceller that explores this property and applies to UMTS-TDD. The results show total cancellation of...
- Tags: Property
- White papers
- Joint Scale-Lag Diversity in Mobile Wideband Systems
- This paper considers the effect of mobility on a wideband Direct Sequence Spread Spectrum DSSS communication system, and study a scale-lag Rake receiver capable of leveraging the diversity that results from mobility. A wideband signal has a large bandwidth-to-center frequency ratio, such that the typical narrowband Doppler spread assumptions do...
- Tags: Mobile, Ohio State University, Mobility, Advertising & Promotion, Marketing
- White papers 2007-03-20
- Implementation of an Anti-Collision Differential-Offset Spread Spectrum RFID System
- Radio Frequency IDentification RFID describes a system by which any product can be labeled with any information that can be accessed at any time without having direct contact with the item. This information can be stored on the item itself, making automation and control incredibly simple, fast, and noninvasive. This...
- Tags: Georgia Institute Of Technology, Solution, Spectrum, RFID, Wireless, Security, Biometrics
- White papers 2006-01-17
- Chaotic Sequences for Secure CDMA
- One family each of repetitive and non-repetitive spreading sequences for secure Direct Sequence Spread Spectrum communication are obtained from the logistic map. The repetitive sequences are perfectly balanced and are found to have sufficient linear complexity. Applicability of both the families to CDMA communication is studied by examining their cross-correlation...
- Tags: CDMA, Sequence, Cellular Phones, Consumer Electronics, Personal Technology
- White papers 2006-02-06
- CDMA Channel Parameters Maximizing TCP Throughput
- A single TCP session traversing a wireless channel is considered in this paper, with a constant SIgnal to Noise Ratio SINR at the receiver. The problem of determining the optimal transmission energy per bit is considered, to maximize TCP throughput. Specifically, in the case where direct sequence spread spectrum modulation...
- Tags: Throughput, CDMA, TCP, Tcp/Ip, Networking
- White papers 2007-01-01
- Tradeoff Between Source Coding and Spreading in a Multicarrier DS-CDMA System Operating Over Multipath Fading Channels With Narrow-Band Interference
- For a fixed total bandwidth expansion factor, and for a fixed channel code rate, the authors' consider the problem of optimal bandwidth allocation between the source coder and the spread-spectrum unit for a multicarrier direct-sequence CDMA system operating over a frequency-selective fading channel with narrow-band interference. Assuming a Gaussian source...
- Tags: Channel, University Of California, Cellular Phones, Consumer Electronics, Personal Technology
- White papers
- Wireless Home Networks - DECT, Bluetooth, HomeRF, and Wireless LANs
- A wireless home network is an intriguing alternative to phone line and power line wiring systems. Wireless home networks provide all the functionality of wireline networks without the physical constraints of the wire itself. They generally revolve around either IR or radio transmissions within your home. Radio transmissions comprise of...
- Tags: Wireless Home Network, LAN, Network, Home Network, Radio, Bluetooth, WLAN, HomeRF, Wi-Fi, Home Networking, Wireless, Networking, Personal Technology
- White papers 2001-03-21
- Spectrum Management in Coordinated Dynamic Spectrum Access Based Cellular Networks
- This paper focuses on spectrum management in next generation cellular networks that employ Coordinated Dynamic Spectrum Access DSA. In this model, a spectrum broker controls and provides time-bounded access to a band of spectrum to wireless service providers and/or end users and implements the spectrum pricing and allocation schemes and...
- Tags: Algorithm, Lucent Technologies Inc., Microsoft Access, Network, Allocation, Cellular Network, Alcatel, Spectrum, Wireless Service, Engineering
- White papers 2005-11-01
- RF Spectrum Policy: Future-Proof Wireless Investment Through Better Compliance
- Radio Frequency RF spectrum is an overlooked but critical resource. It is through the spectrum between 800 MHz and 5.9 GHz that an organization will connect laptops and PDAs to the network, talk on cellular phones, cordless phones, and headsets. Unless properly managed, many of these technologies will crowd the...
- Tags: Radio Frequency, Compliance, Investment, Spectrum, Radio Frequency Spectrum
- White papers 2008-01-01
- Spectrum Shaping for Interference Management in Cognitive Radio Networks
- Most dynamic spectrum access research centers on determining the set of frequencies being used by spectrum license holders, taking its converse, and from what remains selecting the optimal subset of spectrum. This, however, assumes unlicensed transmissions have a square power spectrum By shaping the unlicensed power spectra, it can do...
- Tags: Application, Network, Radio, Spectrum
- White papers 2006-09-26
- DSAP: A Protocol for Coordinated Spectrum Access
- The continually increasing number of wireless devices operating in the unlicensed frequency bands makes the freely-available wireless spectrum a scarce commodity. Under such circumstances, efficient wireless spectrum management is necessary to minimize the effects of overcrowding and maximize quality of service. This paper presents the design, implementation and evaluation of...
- Tags: Microsoft Access, Spectrum, Wi-Fi, Wireless
- White papers
- Spread-Spectrum RF System From Psion Teklogix Improves Efficiency and Baggage Control for Malta Airport
- Baggage control is an important issue for all airports, but it is of particular concern for the Malta International Airport. Located in the middle of the Mediterranean Sea, close to Africa, the Middle East and Russia, Malta Airport authorities must be vigilant about the potential of dangerous materials entering the...
- Tags: Baggage, Psion Teklogix, Advertising & Promotion, Network Technology, Marketing, Networking
- Case studies
- OFDM
- I would like to know your opinion about the including of OFDM in the Spread spectrum Family.Thanks
- Tags: sbalan@..., OFDM
- Discussion threads 2007-07-25
- A Case for Coordinated Dynamic Spectrum Access in Cellular Networks
- Majority of research in Dynamic Spectrum Access DSA networks has focused on free-for-all, opportunistic spectrum access for peer-to-peer ad-hoc communication, typically targeting military applications. This paper proposes that a simple form of DSA called Coordinated DSA that relies on a regional spectrum broker to control spectrum access can bring benefits...
- Tags: Microsoft Access, Network, Cellular Network, Spectrum
- White papers 2005-11-01
- DIMSUMNet: New Directions in Wireless Networking Using Coordinated Dynamic Spectrum Access
- Recent advances in Software Defined Radio SDR, wide band spectrum sensing, and environment aware real-time spectrum allocation show promise of enabling the new paradigm of Dynamic Spectrum Access DSA networks. These networks aim to provide dynamic access to large swaths of spectrum which is currently statically partitioned and underutilized. Majority...
- Tags: Microsoft Access, Network, Wireless Networking, Spectrum, Wireless
- White papers 2005-06-01
- Towards an Architecture for Efficient Spectrum Slicing
- With the increased demands for wireless spectrum, dynamic spectrum sharing is emerging as an important and powerful concept. Most research in this domain is being conducted in design of cognitive radios and on specific PHY and MAC layer challenges associated with them. However, for a dynamic spectrum sharing architecture to...
- Tags: Spectrum
- White papers 2006-10-23
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