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ZDNet Dictionary Definition
- Wireless
- Radio transmission through the air. Wireless is a very generic term that refers to numerous forms of transmission that do not use metal wires or optical fibers. They...
- Full Wireless Definition >>
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- Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
- The authors develop robust Mean-Square Error MSE-optimal training signal designs for multiple-input multiple-output orthogonal frequency-division multiplexing channel estimation with frequency offset and Phase Noise PN, and present analytical and simulation results for the frequency-offset and PN effects on channel estimation. The proposed designs are more advantageous for moderate-to-high values of...
- White papers 2006-10-01
- High Performance Viterbi Decoder for OFDM Systems
- It is well-known that, for systems that deploy conventional convolutional codes, a Viterbi decoder is the best solution in maximum likelihood sense to decode an information sequence. Typically, a Viterbi decoder uses Euclidean or Hamming distance as a metric. The use of a conventional metric leads to a high performance...
- White papers 2006-04-05
- Joint Time-Domain Tracking of Channel and Frequency Offset for OFDM Systems
- This paper addresses the problem of joint channel and frequency offset estimation and tracking for OFDM systems. The proposed method is based on Extended Kalman filtering. The channel taps and the frequency offset are estimated in time-domain while equalization is performed in frequency domain. Simulation results demonstrate accurate tracking capability...
- White papers 2006-03-21
- A Space-Time Receiver for MIMO-OFDM Ad Hoc Networks
- This paper proposes a receiver architecture that can demodulate multiple data streams with different frequency offsets and propagation delays in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) ad hoc networks. The receiver performs joint synchronization and interference cancellation to separate these interfering data streams and achieve synchronization for...
- White papers 2006-03-01
- Multiuser Interference Cancellation for OFDM Systems With Frequency Offset
- This paper proposes a method to counteract the effect of different frequency offsets of the users in a OFDMA uplink system with frequency selective Rayleigh fading channel. The multiple access interference is reduced by reconstructing and removing the interfering signals. This is done by accomplish Successive or Selective Cancellation. The...
- White papers 2003-07-15
- Bluetooth Operation
- The networking standards of Bluetooth will transmit data via low power radio frequency. Bluetooth communicates on a 2.45 GHz frequency. This very band of frequency has been set aside by international agreement for the use of industrial and medical devices. Many devices that one already known and use take advantage...
- White papers
- A Blind Frequency Offset Estimator for OFDM/OQAM Systems
- Like other OFDM-like systems, OFDM/OQAM systems are very sensitive to carrier frequency offset. A new blind carrier frequency estimator is introduced herein for OFDM- /OQAM systems by exploiting the non-circularity of the received signal. Since the received signal exhibits conjugate cyclic frequencies at twice the carrier frequency offset, a frequency...
- White papers
- Joint Channel and Frequency Offset Estimation for OFDM Systems
- In this paper, a joint channel and frequency o set estimation algorithm is proposed. The time variation of the effective Channel Impulse Response CIR due to frequency o set is tracked using a channel tracker. This variation is used to estimate the frequency o set as well as the actual...
- White papers
Additional Resources
- Photos: Top 10 reviews of the week
- Here are CNET Reviews' 10 favorite items from the past week, including a 61-inch rear-projection HDTV, D-Link's dual-band wireless router, and the simple but effective Nokia 6205. by CNET News.com
- Image galleries 2008-07-26
- Mystery solved: Apple's new product is iTablet (updated)
- Previously I speculated about the mysterious "product transition" that Apple's Peter Oppenheimer CFO mentioned no less than seven times in the Q3 2008 Earnings conference call with analysts. Some of his quotes from the call: We are working to develop new products that contains technologies...
- Blog posts 2008-07-25
- GMail adds "https:"-only connections but still not by default
- Google has added a new "Browser Connection" feature to GMail to allow users to force e-mail sessions to always use the more secure "https:" protocol but, strangely, this is not turned on by default. In the Settings tab, at the very bottom, GMail users can now select...
- Blog posts 2008-07-25
- 10 essential gadgets for students
- I chose these from personal experience, but also from asking many friends from around the world who are involved in technology and study at the same time. Some gadgets come with a recommendation, whereas others don't; things like laptops and cell phones can't be selected for everybody, it'd be ridiculous...
- Blog posts 2008-07-25
- TP-LINK TL-WR941ND Wireless N Router
- The TP-Link TL-WR941ND Wireless N Router is a wireless router that supports the Draft N 2.0 specification and not much else. This means no network storage or dual-band support (the router works only in the 2.4GHz frequency), no print-serving capability, and no Gigabit Ethernet. The router doesn't even offer N-mode-only...
- Product reviews 2008-07-24
- Will industry react to new cell phone cancer scare?
- Will industry react to new cell phone cancer scare?hmm...what are we going to do with microwaves, wireless routers and TV & radio stations that emit in a similar spectrum?...Go in the mountains,or... in a cave?What about Bluetooth?So I hear some people saying to use headsets instead, but if they're Bluetooth,...
- Discussion threads 2008-07-24
- 2016: "You're watching the Linux Channel."
- July 24th, 2016. Josef Konsumer, a home-based employee and portfolio manager for ICBC/CiticorpChase, a Chinese-owned multinational investment bank, wakes up to hear his alarm clock go off at 8am, and gets out of bed, his 47-year old body aching from an aggressive personal trainer session from the...
- Blog posts 2008-07-24
- Qualcomm patent ruled invalid in German Nokia case
- The German Federal Patent Court ruled on Wednesday that a Qualcomm GSM patent asserted in a case against the world's top cell phone maker Nokia was invalid. HELSINKI--The German Federal Patent Court ruled on Wednesday that a Qualcomm GSM patent asserted in a case against the world's top cell...
- News items 2008-07-24
- Qualcomm, Nokia deal ends long legal battle
- Qualcomm and Nokia late on Wednesday settled a 3-year, three-continent legal battle over patent licenses and royalties for the next 15 years. NEW YORK--Qualcomm and Nokia late on Wednesday settled a 3-year, three-continent legal battle over patent licenses and royalties for the next 15 years. ...
- News items 2008-07-24
- News to know: DNS flaw; Amazon; Microsoft shakeup; Facebook
- Notable headlines: Ryan Naraine: Researchers borrow from Google PageRank for network defense service Attack code published for DNS flaw Nate McFeters: |)ruid and HD Moore release part 2 of DNS exploit 'Spam King' escapes from federal prison iPhone vulnerable to phishing,...
- Blog posts 2008-07-24
- Gateway FX4710 desktop computer
- Gateway's last $1,000-ish desktop came out earlier this year with an aggressive 4GB of RAM and 64-bit Windows Vista. The resulting performance impressed us greatly. Perhaps working under the assumption that more is always better, Gateway's new $1,150 FX4170 comes with 64-bit Vista and 6GB of RAM. Surprisingly, we saw...
- Product reviews 2008-07-23
- VMWare looks ahead at Microsoft, year-end financials and morale
- VMWare looks ahead at Microsoft, year-end financials and moraleWe need better Wall Street analystsI frequently see the phrase "fell short of Wall Street analysts predictions", as if a company did not do as well as it should have, and has a negative connotation.I'm seeing this phrase with increasing frequency, these...
- Discussion threads 2008-07-23
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