Study on Effect of Cyclic Prefix Extension and Windowing in Cable Modem System

2015 ◽  
Author(s):  
Jin Hyuk Song ◽  
Sang-Jung La ◽  
Jae Hwui Bae ◽  
Nam Ho Hur ◽  
Dong-Joon Choi
Keyword(s):  
Cyclic Prefix ◽  
Cable Modem

Reduction of Cyclic Prefix Overhead in Narrow-Band Internet of Things (NB-IoT) Systems

2020 ◽  
pp. 1-1
Author(s):  
Dejin Kong ◽  
Pei Liu ◽  
Yaru Fu ◽  
Jie Ding ◽  
Tony Q. S. Quek
Keyword(s):  
Internet Of Things ◽  
Narrow Band ◽  
Cyclic Prefix

scholarly journals PHY, MAC, and RLC Layer Based Estimation of Optimal Cyclic Prefix Length

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4796
Author(s):  
Adriana Lipovac ◽  
Vlatko Lipovac ◽  
Borivoj Modlic
Keyword(s):  
Error Recovery ◽  
Cyclic Prefix ◽  
Closed Form Expression ◽  
Delay Spread ◽  
Radio Link ◽  
Medium Access ◽  
Power Delay Profile ◽  
Rms Delay Spread ◽  
Industry Standard ◽  
New Radio

This work is motivated by growing evidence that the standard Cyclic Prefix (CP) length, adopted in the Long Term Evolution (LTE) physical layer (PHY) specifications, is oversized in propagation environments ranging from indoor to typical urban. Although this ostensibly seems to be addressed by 5G New Radio (NR) numerology, its scalable CP length reduction is proportionally tracked by the OFDM symbol length, which preserves the relative CP overhead of LTE. Furthermore, some simple means to optimize fixed or introduce adaptive CP length arose from either simulations or models taking into account only the bit-oriented PHY transmission performance. On the contrary, in the novel crosslayer analytical model proposed here, the closed-form expression for the optimal CP length is derived such as to minimize the effective average codeblock length, by also considering the error recovery retransmissions through the layers above PHY—the Medium Access Control (MAC) and the Radio Link Control (RLC), in particular. It turns out that, for given protective coding, the optimal CP length is determined by the appropriate rms delay spread of the channel power delay profile part remaining outside the CP span. The optimal CP length values are found to be significantly lower than the corresponding industry-standard ones, which unveils the potential for improving the net throughput.

Properties and achievable data rate of a cyclic prefix based imperfect reconstruction filter bank multiple access system

2016 ◽  
Vol 10 (17) ◽  
pp. 2427-2434 ◽  
Author(s):  
Jianqing Dou ◽  
Zaichen Zhang ◽  
Jian Dang ◽  
Liang Wu ◽  
Yuxin Wei ◽  
...  
Keyword(s):  
Multiple Access ◽  
Filter Bank ◽  
Data Rate ◽  
Cyclic Prefix ◽  
Access System ◽  
Reconstruction Filter ◽  
Multiple Access System ◽  
Achievable Data Rate

Single chip subscriber cable modem

2002 ◽  
Author(s):  
S. Rahman ◽  
H. Dehghan ◽  
A. Said
Keyword(s):  
Cable Modem ◽  
Single Chip

scholarly journals Research on single carrier frequency domain equalization system based on FQPSK modulation

2018 ◽  
Vol 17 ◽  
pp. 03012
Author(s):  
Meng Zhang ◽  
Zhisong Bie
Keyword(s):  
Frequency Domain ◽  
Carrier Frequency ◽  
Viterbi Algorithm ◽  
Cyclic Prefix ◽  
Phase Shift Keying ◽  
Frequency Domain Equalization ◽  
Single Carrier ◽  
High Power Amplifier ◽  
Quadrature Phase ◽  
Shift Keying

Feher-patented quadrature phase shift keying (fqpsk) modulation is proposed for single-carrier frequency domain equalization (sc-fde). this paper puts forward a new method modulation called cc-bcd-fqpsk. the fqpsk signal is oversampled to make that the discrete fourier transform (dft)/ inverse dft (idft) processing of it can be applied for sc-fde. the methodology for maintaining waveform continuity with a cyclic prefix (cp) is presented. wrap-around viterbi algorithm (wava) is suggested for demodulation after equalization at the receiver. simulation results show that sc-fde system based on cc-bcd-fqpsk modulation has higher spectral efficiency than linear modulation qpsk and is an effective approach for eliminating isi and using nonlinear high power amplifier.

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