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whitepaper 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 encoded in the relative phase of consecutive symbols in each subchannel or in the...
[11 Apr 2008]
whitepaper Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers.
[11 Apr 2008]
whitepaper This paper analyzes the symbol error rate (SER) performance of OFDM with M-ary Phase-Shift Keying (M-PSK) modulation over Rayleigh-fading channels, in the presence of channel estimation errors. Orthogonal frequency division multiplexing (OFDM) with...
[10 Apr 2008]
whitepaper For small modulation indices, the OFDM-PM signals are shown to be more spectrally contained than conventional OFDM. A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind OFDM-PM is to alleviate the...
[10 Apr 2008]
whitepaper A class of signaling called OFDM angle modulation is presented. This paper focuses on binary OFDM phase modulation, which is a special case of OFDM angle modulation. In this paper a new approach is presented to alleviate the undesirable effects due...
[10 Apr 2008]
whitepaper In this paper, an adaptive downlink modulation using OFDM and MC-CDMA is presented for maximizing the system capacity and actualizing QoS (Quality of Service) control of future mobile communications. To meet the strong demand for broadband...
[10 Apr 2008]
whitepaper Discrete Multitone (DMT) modulation is the industry standard for Asymmetrical Digital Subscriber Loop (ADSL) modems. DMT modulation allows for simplified equalization when the effective duration of the channel memory is shorter that the predefined...
[10 Apr 2008]
whitepaper OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. Implementation of OFDM-based systems suffers from Inphase-Quadrature phase (IQ) imbalances in the front-end analog processing.
[10 Apr 2008]
whitepaper OFDM is a modulation and multiple access technique that has been explored for over 20 years. This paper describes Orthogonal Frequency Division Multiplexing (OFDM) and its application to mobile communications.
[10 Apr 2008]
whitepaper A class of Orthogonal Frequency Division Multiplexing - Continuous Phase Modulation (OFDM-CPM) signals is introduced in which binary data sequence is mapped to complex symbols using the concept of correlated phase states of a CPM signal.
[10 Apr 2008]
whitepaper It can adopt different modulation and signaling formats, among which multi-band OFDM is a more favorable candidate for the upcoming standard. Ultra wideband (UWB) technology has shown significant advantages over other existing ones for short- or...
[10 Apr 2008]
whitepaper This, together with the scarcity of bandwidth resources, motivate research toward developing efficient coding and modulation schemes that improve the quality and bandwidth efficiency of wireless systems.
[10 Apr 2008]
whitepaper For wireless Local Area Network (LAN) the standards have chosen orthogonal frequency division multiplex (OFDM) as modulation scheme. Future wireless applications target multimedia and high-speed internet access, all requiring techniques to improve...
[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 It first compares their peak-to-average power ratio (PAR) and the corresponding power amplifier backoff for phase-shift keying or quadrature amplitude modulation. This paper compares two block transmission systems over frequency-selective fading...
[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 system performance is determined by various transmission techniques, including methods for channel estimation, modulation, as well as channel coding. This paper studies the uplink performance of an orthogonal frequency division multiplexing...
[10 Apr 2008]
whitepaper Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme suitable for wireless communications. It is primarily used in high bit rate systems to mitigate inter-symbol interference (ISI) caused due to de- lay spread.
[03 Apr 2008]
whitepaper This paper proposes to use linear, higher order modulation techniques for priority services instead of the currently deployed non linear modulation schemes used in GSM systems. Cellular services have been ineffective in providing defense and...
[24 Mar 2008]
whitepaper The new modulation method of HSDPA greatly improves the peak data rate and throughput, which enhances spectral ef.ciency. This paper covers HSDPA, High Speed Downlink Packet Access. HSDPA is based on WCDMA evolution, standardized as part of 3GPP...
[12 Mar 2008]
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