Pallavi Garg, Shiva Bhatnagar
This paper focuses on the physical layer of cognitive radio networks (CR), that is, techniques that are used to detect the presence or absence of licensed users in different bands of the electromagnetic spectrum. The techniques presented, with their advantages and disadvantages, are organized hierar...
Pragya Lodhi, Shivangini Saxena
Cognitive radio (CR) emerges as a novel wireless communications technology with the potential to change the inefficient way in which the radio spectrum is currently used. The techniques of dynamic access to the spectrum are a key element in the implementation of radio cognitive technology. This pape...
Sheena S Mary, Rahul Gedam
This paper presents simulation of the OFDM Physical layer specification of IEEE 802.16. Performance analysis of higher data rate is analysed with changing the different modulation techniques using Discrete Cosine Transform (DCT). Forward error correction codes (Reed Solomon and Convolution code) are...
Surbhi Vyas, Pankaj Rathi
This paper presents a simulation model based on 802.16 OFDM-PHY baseband and demonstrated in different simulation scenarios with different modulation techniques; BPSK and QPSK to find out the best performance of physical layer for WiMAX Mobile. The relay multipath fading and AWGN channel model under...
Rupinder Roop, Pallavi Chandel
Alamouti code is a simple space-time code that can be used for transmit diversity systems. This is a class of easily decoded space-time codes that achieve full diversity order in Rayleigh fading channels. Alamouti exist only for certain numbers of transmit antennas and do not provide array gain like...
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