Virtual Carrier-to-Signal Power Ratio Enhancement for Kramers-Kronig Receivers

2019 ◽  
Author(s):  
Chuanbowen Sun ◽  
Di Che ◽  
Honglin Ji ◽  
Zhaopeng Xu ◽  
W. Shieh
Keyword(s):  
Power Ratio ◽  
Signal Power ◽  
Virtual Carrier

scholarly journals Resource Allocation and Outage Performance in OFDMA based Cooperative Cognitive Radio Network for Downlink in Underlay Mode

2019 ◽  
Vol 8 (12) ◽  
pp. 3735-3740 ◽  
Keyword(s):  
Resource Allocation ◽  
Cognitive Radio ◽  
Class Number ◽  
Cognitive Radio Network ◽  
Path Loss ◽  
Power Ratio ◽  
Signal Power ◽  
Radio Network ◽  
Efficient Resource ◽  
Log Normal

Efficient resource allocation is an important process in any network to improve the capacity of a system. In cognitive radio network the resources are shared among licensed & unlicensed users. User is said to be in outage if it does not get required number of resources hence performance of the system gets affected. In this paper the outage probability in orthogonal frequency division multiple access (OFDMA) based cooperative cognitive radio network (CCRN) system is computed. Due to random user position different users require different number of resources. To determine this it is necessary to know the signal to interference ratio (SIR) experienced by the user. First we determine characteristic of interference to signal power ratio by using method of moments. Once the interference to signal power ratio is characterized, user is allocated a class number. Class number gives the number of subcarriers required by a user. For analysis purpose we use downlink in underlay mode with log normal shadowing and path loss exponent. This analysis helps in allocation of resources to the user depending on SIR experienced and outage behavior irrespective of user’s position.

Optimum Carrier to Signal Power Ratio for Remote Heterodyne DD-OFDM in PONs

2013 ◽  
Vol 25 (13) ◽  
pp. 1242-1245 ◽  
Author(s):  
Ivan N. Cano ◽  
Maria C. Santos ◽  
Josep Prat
Keyword(s):  
Power Ratio ◽  
Signal Power

scholarly journals Investigation into the Role of Pump to Signal Power Ratio in FWM-based Phase Preserving Amplitude Regeneration

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
K.R.H. Bottrill ◽  
G. Hesketh ◽  
F. Parmigiani ◽  
D.J. Richardson ◽  
P. Petropoulos
Keyword(s):  
Power Ratio ◽  
Signal Power

scholarly journals Blind Algorithm Development for Peak to Average Power Ratio Reduction in OFDM Systems under Frequency Selective Channels

2019 ◽  
Vol 38 (2) ◽  
pp. 192-130
Author(s):  
Godwin M. Gadiel ◽  
Kamwe Ibwe ◽  
M.M Kisaka
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Cumulative Distribution ◽  
Noise Power ◽  
Power Ratio ◽  
Signal Power ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Frequency Selective ◽  
Frequency Selective Channels

One major drawback of orthogonal frequency division multiplexing (OFDM) system is peak to average power ratio (PAPR). This effect causes high power amplifier (HPA) to introduce intermodulation and out of band radiation as the signal goes through, thus degrades the performance of OFDM systems. This paper proposes blind algorithms which takes advantage of signal transformation technique and signal distortion technique. Simulation results show that at complementary cumulative distribution function (CCDF) level of 10-3 , the proposed algorithm achieved 3.2 dB PAPR improvement compared to discrete Fourier transform with interleaved frequency division multiple access (DFT-IFDMA) based algorithm. The bit error rate (BER) performance has degraded by 2 dB compared to the original OFDM signal with no distortion under frequency selective channel (FCS) at BER of 10-4 . These presented results, mark this algorithm as a better candidate for PAPR reduction algorithm in long term evolution (LTE) network. Under AWGN channels, the proposed algorithm performs better both in low and high signal power values. Under frequency selective channels, the existing and proposed algorithm converges after 10 dB of signal to noise power values. The low BER transmissions at low signal power values signify energy efficiency, ideal for portable wireless devices with limited battery power.

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