scholarly journals Secure Collision-Free Frequency Hopping for OFDMA-Based Wireless Networks

2009 ◽  
Vol 2009 (1) ◽  
Author(s):  
Leonard Lightfoot ◽  
Lei Zhang ◽  
Jian Ren ◽  
Tongtong Li
Keyword(s):  
Wireless Networks ◽  
Frequency Hopping

A Joint Improved Irregular Accumulate Concatenated Tree Coding and Frequency Hopping OFDM Modulation Scheme for Wireless Networks

2014 ◽  
Vol 902 ◽  
pp. 364-369
Author(s):  
Fu Quan Geng ◽  
Zhi Gang Huang ◽  
Xuan Jie Ning ◽  
Mao Fan Yang
Keyword(s):  
Wireless Networks ◽  
Spread Spectrum ◽  
Turbo Codes ◽  
Channel Coding ◽  
Iterative Decoding ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Frequency Hopping ◽  
Modulation Scheme ◽  
Ofdm Modulation

Joint channel coding and spread spectrum modulation technologies bring to wireless networks the tremendous amount of performance improvement, the elimination, and the mitigation of interference. This paper proposes an improved design for irregular accumulate concatenated tree (IACT) codes, which can be viewed as simply precoded by an accumulator. This class of codes belongs to the special turbo-like codes, which combines the advantages of fast encoder structures of turbo codes, and the advantages of parallel high-speed belief-propagation (BP) iterative decoding algorithm of low-density parity-check (LDPC) codes. The improved IACT codes can be coded via a Tanner graph. With these improved codes, we propose a joint IACT coding and frequency hopping orthogonal frequency division multiplexing (FH-OFDM) modulation scheme for wireless networks. We compare the performance of different coding bases such as the irregular concatenated tree (ICT) codes and turbo codes in the scheme by theoretical analysis and simulation. Numerical results are shown that the proposed scheme with these IACT codes has really good performance.

Sign in / Sign up

Export Citation Format

Share Document