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Space-Time Block Coding For Single-Carrier Block Transmission DS-CDMA Downlink
White Papers To tackle this MUI problem in the downlink, two specific DS-CDMA and STBC techniques are combined, namely single-carrier block transmission (SCBT) DS-CDMA and time-reversal STBC. However, if not carefully designed, the resulting transmission scheme...
[July 26, 2005, 6:00]
Why 802.11n Is A Hard Act To Swallow review
Reviews The 802.11b standard layered multiple techniques on top of each other -- a basic transmission standard where the carrier was shifted between four different phases, with the data further encoded into patterns that are particularly easy to...
[November 21, 2006, 7:46]
Short Introduction To OFDM
White Papers OFDM is a particular form of Multi-carrier transmission and is suited for frequency selective channels and high data rates. This technique transforms a frequency-selective wide-band channel into a group of non-selective narrowband channels, which...
[March 30, 2005, 3:00]
OFDM Based WLAN Systems
White Papers Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multi-carrier transmission where all the subcarriers are orthogonal to each other. OFDM promises a higher user data rate and great resilience to severe signal fading effects of...
[April 18, 2007, 1:00]
The Utility Of Perceptive Communication Between Distant Wireless Nodes
White Papers CSMA-based MAC protocols require wireless nodes to share the transmission medium with other nodes that are within Carrier-Sensing (CS) range. Hence, operations that depend on and can potentially affect the state of the shared medium, such as...
[August 13, 2007, 8:09]
On The Comparison Between OFDM And Single Carrier Modulation With A DFE Using A Frequency-Domain Feedforward Filter
White Papers This paper proposes a new frequency-domain decision feedback equalizer (FD-DFE) for single carrier modulation, which makes use of a data block transmission format similar to that of the orthogonal frequency-division multiplexing with cyclic prefix...
[November 2, 2004, 2:00]
Efficient Collaborative (Viral) Communication In OFDM Based WLANs
White Papers After showing that OFDM can be viewed as a set of parallel Gaussian channels with different frequency gain for each sub-carrier, authors design receiving schemes that exploit both the direct transmission between transmitter and receiver as well as...
[January 24, 2008, 0:18]
Tone Reservation Method For PAPR Reduction Scheme
White Papers The multi-carrier signal can support high-rate data transmission in wireless channel environments. Meanwhile, a large number of subchannels in a multi-carrier signal cause the large PAPR that requires the wide range linearity of the amplifier.
[March 30, 2005, 3:00]
OFDM Or Single-Carrier Block Transmissions?
White Papers This paper compares two block transmission systems over frequency-selective fading channels: orthogonal frequency-division multiplexing (OFDM) versus single-carrier modulated blocks with zero padding (ZP).
[October 21, 2004, 6:56]
Millimetric UWB OFDM PHY Layer Designs For VHDR WPANs And Performance Analysis (IST Magnet Project)
White Papers Original UWB-OFDM and WB-OFDM parameter sets are defined in connection with an enhanced spectrum efficiency close to the sub-carrier spacing. These transmission modes are evaluated thanks to a BER performance analysis and a budget link set-up that...
[August 1, 2007, 2:02]
A Generic Transmission Scheme For Fourth Generation Wireless Systems
White Papers This paper proposes a generic transmission scheme that allows to instantiate all the combinations of orthogonal Frequency-Division Multiplexing (OFDM) and cyclic-prefixed Single-Carrier (SC) modulations with Time-Division Multiple Access (TDMA...
[January 20, 2006, 0:01]
Crest Factor Considerations In MC-CDMA With Carrier Interferometry Codes
White Papers Carrier interferometry codes, applied to N-carrier MC-CDMA systems, enable 2N users to simultaneously share the system bandwidth with minimal degradation in performance (relative to the N orthogonal user case).
[July 25, 2004, 3:16]
Asymptotic Performance Analysis For Redundant Block Precoded OFDM Systems With MMSE Equalization
White Papers A multi-carrier OFDM system using a Cyclic Prefix for preventing inter-block interference is known to be equivalent to multiple flat fading parallel transmission channels in the frequency domain. Linear Precoding consists in multiplying by a N x K...
[October 11, 2008, 1:22]
Multicarrier CDMA Systems Using PCC-OFDM
White Papers Equalizers to counteract multipath transmission are much simpler for PCC-OFDM than for single carrier systems or for OFDM systems without a cyclic prefix. Polynomial cancellation coded orthogonal frequency division multiplexing (PCC-OFDM) with...
[October 21, 2004, 3:00]
Performance Of Multi-Carrier Spread-Spectrum Systems With Spatial Diversity And Pre-Equalization
White Papers In this paper, the benefit of applying channel knowledge at the transmitter is investigated for Multi-Carrier Spread-Spectrum (MC-SS) systems. Two different MC-SS systems are observed, namely uplink Multi-Carrier Code-Division Multiple-Access...
[February 17, 2006, 0:01]
Cooties
Downloads After students have finished meeting each other, they collaboratively determine the initial carrier of the disease and trace the transmission path among coodles. Cooties is a simulation program that students use collaboratively to examine the...
[July 2, 2003, 21:25]
Understanding International Voice Compression Solutions
White Papers Limitations in early voice transmission technology made it impossible to carry sufficient voice traffic to justify the carrier's international leased line charges - while making a reasonable profit. Recent advances in voice compression technology...
[August 27, 2003, 0:00]
MC-CDMA Versus OFDMA In Cellular Environments
White Papers The paper investigates on the one hand, an Orthogonal Frequency Division Multiplexing (OFDM) based Multiple Access scheme (OFDMA), and on the other hand, a Multi-Carrier Code Division Multiple Access (MC-CDMA) scheme.
[February 17, 2006, 0:01]
Wireless LAN Performance In The Presence Of Bluetooth Interferers
White Papers A simulation model is developed to model the carrier sense multiple access with collision avoidance (CSMA/CA) protocol of a WLAN station (STA). This paper characterizes the effects of these transmission delays.
[November 10, 2005, 0:00]
Frequency Domain DFE: System Design And Comparison With OFDM
White Papers A novel frequency domain equalizer for single carrier modulation is presented. The new scheme makes use of a data block transmission format, which can be seen as a generalization of the zero padded transmission.
[October 21, 2004, 3:00]
