scholarly journals Robustness of IFDMA as Air Interface Candidate for Future High Rate Mobile Radio Systems

2005 ◽  
Vol 3 ◽  
pp. 265-270 ◽  
Author(s):  
T. Frank ◽  
A. Klein ◽  
E. Costa ◽  
E. Schulz
Keyword(s):  
Multiple Access ◽  
Average Power ◽  
Low Complexity ◽  
Mobile Radio ◽  
High Rate ◽  
Signal Model ◽  
Air Interface ◽  
Mobile Radio Systems ◽  
Dispersive Channel ◽  
Radio Systems

Abstract. The Interleaved Frequency Division Multiple Access (IFDMA) scheme is a candidate for next generation mobile radio systems. IFDMA is based on compression, repetition and subsequent user dependent frequency shift of a modulated signal. As in OFDMA, multiple access is enabled by the assignment of overlapping but mutually orthogonal subcarriers to each user. It provides various advantages such as low peak to average power ratio, orthogonality of the signals of different users even for transmission over a time dispersive channel and low complexity. However, IFDMA is sensitive to frequency offsets. In this paper, a derivation of IFDMA based on a generalised OFDMA signal model with specific precoding and specific subcarrier allocation is presented. Moreover, simulation results showing the robustness properties of IFDMA against frequency errors are given.

scholarly journals Performance analysis of a novel OWDM-IDMA approach for wireless communication system

2012 ◽  
Vol 8 (3) ◽  
pp. 61
Author(s):  
Awatif Rouijel ◽  
Benayad Nsiri ◽  
Driss Aboutajdine
Keyword(s):  
Wavelength Division Multiplexing ◽  
Multiple Access ◽  
Additive White Gaussian Noise ◽  
Average Power ◽  
Low Complexity ◽  
High Rate ◽  
Fourth Generation ◽  
Wavelength Division ◽  
Rate Transmission ◽  
Multiple Access Schemes

Efficiency and adaptivity play a major role in the design of fourth-generation wireless systems (4G). These systems should be efficient in terms of bandwidth and power allocation and will satisfy the users requirement on low power consumption, little interferences with other systems, and high rate transmission. Moreover, low complexity transceivers are expected. This paper will propose a novel multiple access technique called OWDM-IDMA (Orthogonal Wavelength-Division Multiplexing-Interleave Division Multiple Access) as the combination of the OWDM (Orthogonal Wavelength-Division Multiplexing) and IDMA (Interleave Division Multiple Access) schemes. The IDMA and OWDM principles are also outlined. The comparison between the conventional OFDM-IDMA and the proposed OWDM-IDMA is performed in term of Power to Average Power Ratio PAPR, as well as evaluating the performance of our presented technique over Additive White Gaussian Noise AWGN multipath channels by estimating the BER (Binary Error Rate).

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