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Pulse-Shaping OFDM/BFDM Systems For Time-Varying Channels: ISI/ICI Analysis, Optimal Pulse Design, And Efficient Implementation
White Papers This paper analyzes the InterSymbol/InterCarrier Interference (ISI/ICI) in such systems when they operate over time-varying channels. Two methods for an ISI/ICI-minimizing pulse design are proposed, and efficient FFT-based modulator and demodulator...
[January 1, 1970, 0:59]
Adaptive Antenna Arrays For CCI/ISI Reduction In Broadband F/TDMA Cellular Networks
White Papers The STF suppresses CCI and reduces Inter-Symbol Interference (ISI) while capturing spatial diversity. The MLSE removes the residual Inter-Symbol Interference (ISI). Adaptive array antennas are very effective in mitigating the effects of Co-Channel...
[January 1, 1970, 0:59]
A RAKE Receiver With ICI/ISI Equalizer For CCK Wireless LAN Modem
White Papers As the delay spread is larger, Inter-Symbol Interference (ISI) and Inter-Chip Interference (ICI) generated due to multipath environments are increased. To handle the increasing ISI and ICI, CCK wireless LAN modem needs ISI and ICI cancellation...
[January 1, 1970, 0:59]
News Burst: New OS For PDAs
News Mitsubishi will develop silicon for the devices, while ISI will take a chief role in engineering an OS to rival current PDA and palmtop interfaces from Microsoft, 3Com and Symbian. A research manager at analyst firm IDC said that although any...
[September 7, 1999, 16:56]
Enabling Small Businesses In Turkey To Further Automate Their Processes And To Comply With New Government Regulations For Inflationary Accounting And For The Switchover To A New Currency
White Papers Established in July 1995, Net ISI is installing automation and infrared heating solutions for poultry-houses and infrared heating solutions for industrial buildings. With the support of Casper Computer, LOGO Business Solutions and Intel, Net ISI...
[January 1, 1970, 0:59]
Intercarrier And Intersymbol Interference Analysis Of OFDM Systems On Time-Varying Channels
White Papers In intersymbol interference (ISI) and intercarrier interference (ICI) for OFDM systems with insufficient guard length was analyzed in the case of time-invariant radio channels. The same technique is used in this paper to compute the ISI and ICI...
[January 1, 1970, 0:59]
Research Of DFT-OFDM And DWT-OFDM On Different Transmission Scenarios
White Papers To combat ISI, ICI, cyclic prefix is insert between DFT OFDM symbols, and this will take up nearly 25 percent of bandwidth. To improve the bandwidth efficiency and ISI, ICI, DWT (discrete wavelet transforms) based OFDM (DWT-OFDM) is proposed.
[January 1, 1970, 0:59]
Precoded And Vector OFDM Robust To Channel Spectral Nulls And With Reduced Cyclic Prefix Length In Single Transmit Antenna Systems
White Papers The performance of orthogonal frequency-division multiplexing (OFDM) systems may be degraded when intersymbol interference (ISI) channels have spectral nulls. Also, when ISI channels have many taps, the data rate overhead due to the insertion of...
[January 1, 1970, 0:59]
WebPDA: A New Handheld Contender?
News Analysts have responded positively to news that US software developer Integrated Systems (ISI) and Japanese technology giant Mitsubishi are working together to develop a handheld operating system as well as hardware devices.
[September 8, 1999, 11:16]
Adaptive Signature Generation For DS/CDMA Systems Over Dispersive Channels
White Papers This paper proposes a new dynamic signature generation method to reduce both, multiuser interference (MUI) and inter-symbol interference (ISI) for DS/CDMA systems working in varying dispersive channels.
[January 1, 1970, 0:59]
PAPR Reduction In OFDM Systems Using Constellation Shaping
White Papers OFDM prevents Inter Symbol Interference (ISI) by inserting a guard interval and mitigates the frequency selectivity of a multi-path channel by using a simple equalizer. In systems with a high-speed transmission of data, large delay spreads can...
[January 1, 1970, 0:59]
Frequency-Time Block Codes For OFDMA Uplink Applications
White Papers Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme primarily used in high bit rate systems to mitigate inter-symbol interference (ISI) due to delay spread in multipath wireless channels.
[January 1, 1970, 0:59]
Exploiting Multipath Induced Diversity In OFDM Systems
White Papers It is primarily used in high bit rate systems to mitigate inter-symbol interference (ISI) caused due to de- lay spread. While the ISI caused by delay spread is an annoyance factor, it also provides path diversity advantage if the path gains fade...
[January 1, 1970, 0:59]
Adaptive Resource Allocation In Multiuser OFDM Systems
White Papers High data rate communication over wideband channels are significantly limited by Inter-Symbol Interference (ISI) due to frequency selective or time dispersive nature of the channels. Orthogonal Frequency Division Multiplexing (OFDM) has...
[January 1, 1970, 0:59]
Adaptive Subcarrier And Power Allocation For Multiuser OFDM In Wireless Environments - A Survey
White Papers The time dispersive and frequency-selective nature of the wireless channel causes InterSymbol Interference (ISI) and fading to be a serious impediment in wireless communication. The use of cyclic prefixes in OFDM has also been effective at...
[January 1, 1970, 0:59]
Downlink Performance Of An OFDM Based Multiple Access System For Indoor Wireless Communications
White Papers In such channels, transmission of high data rate signals using conventional single carrier techniques can result in severe intersymbol interference (ISI) and a consequent increase in the equalizer complexity.
[January 1, 1970, 0:59]
Performance Analysis Of OFDM System Based On IEEE 802.11a
White Papers However, ISI (Inter-Symbol Interference), which is the severe problem in the case of the existence of multipath fading, can be occurred more frequently in high-speed multimedia data transmission. In other words, degradation of transmitted data due...
[January 1, 1970, 0:59]
Bit Interleaved Coded Modulation With Space Time Block Codes For OFDM Systems
White Papers In addition to the destructive multipath nature of wireless channels, frequency selective channels pose InterSymbol Interference (ISI) while offering frequency diversity for successfully designed systems.
[January 1, 1970, 0:59]
Performance Of Space-Time Block Coded OFDM In Time-Selective Macrocell Channel Environments
White Papers As such the orthogonality between subcarries in time-selective channel will not hold, resulting in interchannel interference (ISI). To combat ISI, the authors tried different detection schemes in a comparative study.
[January 1, 1970, 0:59]
On The Tradeoff Between Two Types Of Processing Gain
White Papers It is demonstrated that in non Inter-Symbol Interference (ISI) channels there is no tradeoff between the two types of processing gain. However, in ISI channels a tradeoff between the two types of processing gain exists.
[January 1, 1970, 0:59]
