- CNET NETWORKS UK BUSINESS SITES:
- atlarge.com
- BNET UK
- silicon.com
- SmartPlanet.com
- ZDNet.co.uk
377 stories on
Sort by: Date | Relevance
whitepaper The two methods exhibit two essentially different behaviors in fading conditions. In an OFDM system, various modulation methods can be used in order to encode the binary information. If a differential phase modulation scheme is chosen, data can be...
[11 Apr 2008]
whitepaper Performance analyses based on both pairwise error probability (PEP) and error bounds are conducted over a more general block fading channel that possesses both frequency and time diversity, and of which the fast and quasi-static fading channels...
[10 Apr 2008]
whitepaper This paper considers the performance degradation of a high QAM orthogonal frequency division multiplexing (OFDM) system over frequency selective time-varying fading channels. The time variation of the channel during one OFDM frame destroys the...
[10 Apr 2008]
whitepaper Orthogonal frequency division multiplexing (OFDM) with pilot symbol assisted channel estimation is a promising technique for high rate transmissions over wireless frequency-selective fading channels. This paper analyzes the symbol error rate (SER...
[10 Apr 2008]
whitepaper In wireless links, multipath fading causes performance degradation and constitutes the bottleneck for increasing data rates. Traditionally, the most popular technique to combat fading has been the exploitation of diversity.
[10 Apr 2008]
whitepaper The system uses differential binary phase shift keying (DBPSK) modulation and post detection diversity combining, considering slowly Rician fading and frequency selective channel in the indoor environment.
[10 Apr 2008]
whitepaper The performance of OFDM based systems is seriously affected by imperfections in system implementation. To gain a better understanding of the influence of these impairments on the performance of multiple antenna OFDM systems, this paper studies a...
[10 Apr 2008]
whitepaper 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).
[10 Apr 2008]
whitepaper Orthogonal frequency-division multiplexing (OFDM) converts a frequency-selective fading channel into parallel flat-fading subchannels, thereby simplifying channel equalization and symbol decoding. This paper introduces a linear constellation...
[10 Apr 2008]
whitepaper OFDM is considered to support high data rates and carrier separation is introduced to combat multipath fading. While promising robustness against multipath fading, the computational complexity of a carrier separated OFDM system can be made to be as...
[10 Apr 2008]
whitepaper When the Alamouti code is applied (as a space-time block code) to an OFDM system with transmit diversity, the simple Alamouti decoding requires that each subchannel is flat-fading and constant over two symbol periods (Alamouti codeword period).
[10 Apr 2008]
whitepaper It is found that the spectral efficiency of randomly spread CDMA subject to Gaussian noise and flat fading in the large-system limit under arbitrary input distributions. This paper presents some new results on large-system CDMA obtained through the...
[10 Apr 2008]
whitepaper The combination of multiple-input multiple-output (MIMO) signal processing with orthogonal frequency division multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next-generation wireless communication systems...
[10 Apr 2008]
whitepaper The combination of Multiple-Input Multiple-Output (MIMO) signal processing with Orthogonal Frequency Division Multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next generation wireless communication systems...
[10 Apr 2008]
whitepaper This paper identifies the maximum achievable diversity order for i.i.d.or correlated Rayleigh fading channels and also provide design rules for achieving maximum diversity gains with LP-OFDM. Orthogonal Frequency Division Multiplexing (OFDM...
[10 Apr 2008]
whitepaper The effects of non-ideal transmission conditions of the OFDM system including channel estimation errors, symbol timing offset, carrier and sampling clock offset, phase noise and time-selective fading are analyzed.
[10 Apr 2008]
whitepaper OFDM is a promising digital modulation technique that effectively divides the frequency band into a number of narrow subcarriers that are each flat-fading. Link Adaptation (LA) is a powerful means of increasing throughput in wireless channels by...
[10 Apr 2008]
whitepaper Different pre-equalization techniques are investigated, and it is shown that pre-equalized OFDM-CDM systems can achieve promising performance in fading channels. In this paper, the potential of orthogonal frequency-division multiplexing-code...
[10 Apr 2008]
whitepaper This paper analyzes and simulates the forward-link capacity of a CDMA system with mixed multirate sources in a multipath fading channel. Some studies have been done on capacity of a code division multiple access (CDMA) system with mixed multirate...
[10 Apr 2008]
whitepaper Generally, wireless networks have many different characteristics compared to fixed networks, as the radio signal is affected by fading, shadowing and interference that also change over time. The number of Internet users and the demand for wireless...
[14 Jan 2008]
Sort by: Date | Relevance
Copyright ©1995-2008 CNET Networks, Inc. All rights reserved. Top of page
