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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 Channel estimation error degrades the performance of coherent receiver limiting capacity, data rate and performance of the overall OFDM system. Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high...
[11 Apr 2008]
whitepaper This paper presents a partial DFT-based modified OFDM system that is resistant to channel nulls, when the channel state information is known to both the transmitter and the receiver. It shows the relationship between this method and filterbank...
[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 The proposed method does frame detection using a threshold comparison mechanism and performs Orthogonal Frequency Division Multiplexing (OFDM) symbol boundary detection using correlation techniques. In this paper, a robust and efficient frame...
[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 enhance system capacity, novel technologies...
[10 Apr 2008]
whitepaper Most systems rely on the use of Orthogonal Frequency Division Multiplexing (OFDM) because of its capability to elegantly cope with multi-path interference. However, while OFDM provides a nice solution for the digital modem, its front-end...
[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 A carrier separated OFDM system is proposed to support high data rates in mobile multiple access environments. The performance is comparable to that of a frequency hopped OFDM system. While promising robustness against multipath fading, the...
[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 presents the system design of an integrated receiver for the next generation high-speed mobile data communications based on OFDM. An overview of the OFDM system suitable for mobile communications is described.
[10 Apr 2008]
whitepaper Furthermore, since spatial diversity is the ultimate way to increase system capacity in bandwidth-cautious wireless applications, the SVD antenna-array processing algorithm is also implemented and will be integrated with the OFDM receiver.
[10 Apr 2008]
whitepaper The code-division multiplexing (CDM) component within an orthogonal frequency-division multiplexing (OFDM) system enables additional diversity in frequency- and time-selective mobile radio channels. In this paper, the potential of orthogonal...
[10 Apr 2008]
whitepaper This paper studies multiuser orthogonal frequency division multiplexing (OFDM) system using adaptive subchannel and power allocation with partial channel information. Previous research on multiuser OFDM includes margin adaptive (MA) optimization...
[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 This paper studies the uplink performance of an orthogonal frequency division multiplexing (OFDM) wireless system where multiple antennas are utilized at the base station (BS). The system performance is determined by various transmission techniques...
[10 Apr 2008]
whitepaper The influence of phase noise (PN) on the performance of a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based communication system is analyzed. A PN power weighting function is derived which indicates the...
[10 Apr 2008]
whitepaper In this paper, the effect of IQ imbalances on an OFDM-based system with Alamouti coding is studied and an efficient receiver with compensation for IQ imbalances is then derived. Implementation of OFDM-based systems suffers from In-phase and...
[10 Apr 2008]
whitepaper This paper considers link adaptation in an orthogonal frequency division multiplexing (OFDM) system. OFDM is a promising digital modulation technique that effectively divides the frequency band into a number of narrow subcarriers that are each flat...
[10 Apr 2008]
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