SI Free PTS Technique for PAPR Reduction in OFDM Systems Using Concentric Circle Constellation Mapping
Md. Moshiur Rahman,
Muhammad Ahad Rahman Miah,
Farhana Akter Mou
Issue:
Volume 4, Issue 5, September 2016
Pages:
68-75
Received:
19 October 2016
Accepted:
31 October 2016
Published:
18 November 2016
DOI:
10.11648/j.wcmc.20160405.11
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Abstract: The Orthogonal Frequency Division Multiplexing is one of the widely used modulation techniques in the broadband wireless technology. One of the main problems is the high peak-to-average power ratio of transmitted signal due to the superposition of many subcarriers. Partial transmit sequences (PTS) is a popular technique to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. PTS is highly successful in PAPR reduction and efficient redundancy utilization, but the considerable computational complexity for the required search through a high-dimensional vector space and the necessary transmission of side information (SI) to the receiver are potential problems for a practical implementation. Existing SI embedding schemes eliminate the requirement of SI transmission but these suffer from one drawback or the other, whether in terms of computational complexity, poor PAPR reduction capability or incorrect SI detection. In this paper we have considered SI free PTS based method ‘Concentric Circle Constellation Mapping (CCCM)’, which do not require SI at the receiver with low computational complexity and better PAPR reduction capability with low SER probability.
Abstract: The Orthogonal Frequency Division Multiplexing is one of the widely used modulation techniques in the broadband wireless technology. One of the main problems is the high peak-to-average power ratio of transmitted signal due to the superposition of many subcarriers. Partial transmit sequences (PTS) is a popular technique to reduce the peak-to-averag...
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Orthogonal Space Time Block Code for Four Time Slots for Uplink Transmission
Hala M. Abd Elkader,
Gamal M. Abdel-Hamid,
Adly S. Tag El-Dien,
Asmaa A. Nassif
Issue:
Volume 4, Issue 5, September 2016
Pages:
76-80
Received:
7 November 2016
Accepted:
26 November 2016
Published:
23 December 2016
DOI:
10.11648/j.wcmc.20160405.12
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Abstract: In this paper, a new proposed space-time code for four-time slots and two transmitters for uplink transmission in a mobile system is presented. The mobile system needs three or four-time slots for data transmission. Also, this code is applied for multi-input multi-output (MIMO) fading channel. The proposed orthogonal space-time code achieves the properties of space-time code such as a full rate, full diversity, and non-vanishing minimum determinant value (MDV). The coding gain of this code is high because it achieves the trace or determinant criterion. Also, the proposed code needs a linear maximum likelihood (ML) decoding to decode four real symbols. Simulation results show that the performance of the proposed code is better than the performance of the previously presented schemes that are used in a mobile system for different modulation and diversity.
Abstract: In this paper, a new proposed space-time code for four-time slots and two transmitters for uplink transmission in a mobile system is presented. The mobile system needs three or four-time slots for data transmission. Also, this code is applied for multi-input multi-output (MIMO) fading channel. The proposed orthogonal space-time code achieves the pr...
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