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whitepaper Multi-Carrier Modulation has features that make it ideal for communications over dispersive channels in which both the insertion loss of the channel and the injected noise are frequency dependent. Practical wireline and wireless channels present...
[21 Mar 2005]
whitepaper To overcome the potential problem of saturated airwaves, Bluetooth developers have combined several modulation schemes, including Gaussian Frequency Shift Keying and Spread Spectrum via frequency hopping.
[17 Nov 2005]
whitepaper A blind modulation-index estimator for a combined CPM/OFDM Receiver is developed in this paper. The Software Defined Radio (SDR) project combines two different types of standards, Bluetooth and HiperLAN/2 on one flexible platform.
[29 Nov 2005]
whitepaper Adaptive modulation is implemented on a wideband OFDM transceiver prototype to quantify its performance in indoor wireless environment. The measured adaptive average data rate is 2.88 times the average data rate without adaptive modulation.
[11 Apr 2007]
whitepaper For high bandwidth efficiencies, combined phase and amplitude modulation is used. Power- and bandwidth-efficient differentially encoded transmission over slowly time-varying fading channels with noncoherent reception and without channel state...
[14 Apr 2007]
whitepaper This paper reports the first use of ID Modulation to embed a bitstream representing sensor information in a standards-compliant Radio Frequency IDentification (RFID) channel. ID Modulation embeds a new lower bit-rate channel in a pre-existing host...
[14 Feb 2006]
whitepaper The channel capacity of some ISI channels is examined under the condition that OFDM in conjunction with QAM modulation for subcarriers and the BICM coding scheme is used. The combination of higher order modulation schemes and low rate codes yields...
[14 Apr 2007]
whitepaper This paper discusses current wireless broadband technologies and how BridgeWave's unique technology, Signal Code Modulation, enables seamless wired to wireless integration. An example SCM application is also presented.
[24 Feb 2004]
whitepaper Adaptive modulation has been shown to have significant benefits for high-speed wireless data transmission when orthogonal frequency division multiplexing (OFDM) is employed. However, accurate channel state information (CSI) is required at the...
[21 Jul 2005]
whitepaper Adaptive Modulation and Coding (AMC) is receiving increasing attention as an effective method to enhance the performance of wireless systems. This paper proposes AMC as a method for the Bit-Interleaved Coded OFDM (BIC-OFDM) packet transmission.
[11 Apr 2007]
whitepaper This paper presents an orthogonal frequency-division multiplexing (OFDM) system with bit-interleaved space-frequency coded modulation for frequency selective fading channels employing multiple transmit and receive antennas.
[01 Nov 2004]
whitepaper In the positioning of multi carrier modulation, the location of the Mobile Terminal (MT) is estimated by using the correlation of the pilot symbol known to MT. This paper proposes a MT positioning method in which not only pilot symbols but also...
[18 Apr 2007]
whitepaper This paper introduces adaptive signaling techniques that use nonuniform Phase-Shift-Key (PSK) modulation. The characteristics of mobile wireless communication channels fluctuate for many reasons, including movement of the radios, changes in path...
[10 Nov 2006]
whitepaper The residual capacity is derived from the feasibility condition for power control using an adaptive prediction technique based on delta modulation. Two access control protocols are considered: Modified Delta Modulation with Scheduled access (MDM-S...
[10 Nov 2006]
whitepaper This program will cover RF testing and modulation quality analysis of 802.11g components and systems, with a focus on what engineers need to know beyond the needs of 802.11b. We’ll cover the latest testing requirements, including RF spectrum and...
[19 Jun 2004]
whitepaper This paper studies the problem of modulation and coding for doubly dispersive, i.e.time and frequency selective fading channels. Using the recent result that under-spread linear systems are approximately diagonalized by biorthogonal Weyl-Heisenberg...
[18 Apr 2007]
whitepaper A high level modulation (8-PSK) was introduced in the evolution of GSM or EDGE. Using this modulation the maximum data throughput which can be achieved in the EGPRS protocol is 473.6kbps. For the next generation of mobile communications there is a...
[20 Jul 2004]
whitepaper This paper presents an orthogonal frequency-division multiplexing (OFDM) system with bit-interleaved space-frequency coded modulation for frequency-selective fading channels employing multiple transmit and receive antennas.
[16 Oct 2004]
whitepaper Bit-interleaved coded modulation gives good diversity gains with higher order modulation schemes using well known binary convolutional codes. Space-Time coding techniques are methods to improve transmission efficiency in radio channels by using...
[01 Nov 2004]
whitepaper This paper describes the DOCSIS 2.0 A-TDMA services feature, which provides support for DOCSIS 2.0 Advanced Time Division Multiple Access (A-TDMA) upstream modulation profiles on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U...
[20 Jul 2004]
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