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whitepaper In this paper, the effect of IQ imbalances on OFDM receivers is analyzed and system level algorithms to compensate for these distortions are proposed. OFDM is a widely recognized and standardized modulation scheme for future high bit rate...
[10 Apr 2008]
whitepaper Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular and wireless LAN systems. The sum capacity of MU-OFDM is maximized when each subchannel is assigned to...
[10 Apr 2008]
whitepaper Cadence's SPW software was utilised initially for developing system level models, test bench generation, and simulation of the receiver including sophisticated radio channel models. Motorola, the first to market DVB-T demodulation technology and...
[10 Apr 2008]
whitepaper As an example this paper refers to a system using multiple description coding at application layer combined with orthogonal frequency division multiplexing at the link level to provide robustness against hostile wireless channels.
[10 Apr 2008]
whitepaper This paper proposes the cooperative resource allocation over multiuser OFDM networks, by exploring the broadcast nature of the wireless channel and the consequently possible cooperation among users to improve the system performance.
[02 Apr 2008]
whitepaper This paper proposes a system to transmit multiple 3-D embedded wavelet video programs over downlink multi-user OFDM. By exploring frequency, time, and multiuser diversity in OFDM and flexibility of 3D embedded wavelet video codec, the proposed...
[23 Jan 2008]
whitepaper It is argued that traditional "voice over IP" (VoIP) approaches are inefficient for wireless LANs in terms of system overheads, and that more recent proposals, such as the "5- UP" protocol, offer greater promise with the co-existence of OFDM, for...
[14 Jan 2008]
whitepaper Coupled with a robust and efficient OFDM air interface, MIMO technologies lead to a very compelling high-speed data downlink solution for future wireless systems. This paper presents Nortel Networks' MIMO-OFDM concept prototype and measured...
[07 Jan 2008]
whitepaper The work discussed in this paper presents the design, validation and FPGA based implementation of an "Orthogonal Frequency Division Multiplexing" (OFDM) modulator for IEEE 802.16 using a high level design tool, and also reports the resources...
[07 Jan 2008]
whitepaper In this paper, a MIMO OFDM system is developed, which employ interleaver at the transmitter to implement frequency domain diversity. MIMO OFDM is one of the most promising techniques to achieve high data rate over mobile wireless channels.
[17 Sep 2007]
whitepaper Flarion's FLASH-OFDM system meets the needs of the 450MHz operators that are looking to deploy a mobile broadband solution. Across the globe, 450MHz operators continue to investigate the technology options for delivering a differentiating mobile...
[17 Sep 2007]
whitepaper This paper describes an approach for prototyping a MIMO-OFDM system using a flexible Software Defined Radio (SDR) system architecture in conjunction with commercially available hardware. Combining MIMO with Orthogonal Frequency Division...
[31 Aug 2007]
whitepaper The term is synonymous with FLASH-OFDM, a 3G alternative system developed and marketed by Flarion Technologies. Mobile broadband is defined as broadband access (e.g.cable and DSL) in the cellular environment.
[23 Aug 2007]
whitepaper This paper describes an approach for prototyping a MIMO-OFDM system using a flexible Software Defined Radio (SDR) system architecture in conjunction with commercially available hardware. Combining MIMO with Orthogonal Frequency Division...
[10 Aug 2007]
whitepaper A test system is built in which the OFDM based Wireless LAN standard IEEE 802.11a is extended with MIMO. A promising way to achieve this is the combination of Multiple-Input Multiple-Output (MIMO) signal processing with Orthogonal Frequency...
[08 Aug 2007]
whitepaper This paper presents MIMO-OFDM channel estimation for spatially correlated channels using frequency domain estimation techniques. For example, in a system with 16 transmit antennas, the use of additional filtering in spatial domain improves the...
[07 Aug 2007]
whitepaper MIMO-OFDM systems are gaining prominence in high data rate applications due to their increased spectral efficiency. In MIMO-OFDM systems, I/Q mismatch causes interference between the frequency mirror subcarriers.
[02 Aug 2007]
whitepaper This paper presents a new UltraWideBand concept designated as the "millimetric UWB OFDM system" where the UltraWideBand communication is defined at 60 GHz to draw benefit from the small wavelength. Original UWB-OFDM and WB-OFDM parameter sets are...
[01 Aug 2007]
whitepaper This paper describes the sources and the effect of the IQ imbalance as well as a new method for correcting the error due to the imbalance in Orthogonal Frequency Division Multiplexing (OFDM) systems. This means that conventionally negligible error...
[31 Jul 2007]
whitepaper For narrow-band systems, these reflections will not be resolvable by the RX when the narrow-band system bandwidth is less than the coherence bandwidth of the channel. There are many differences between real-world behavior of narrow-band and UWB...
[25 Jul 2007]
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