Enhancing the spectral efficiency of the American digital cellular system with coded modulation

2002 ◽  
Author(s):  
S. Chennakeshu ◽  
R.D. Koilpillai ◽  
E. Dahlman
Keyword(s):  
Spectral Efficiency ◽  
Coded Modulation ◽  
Cellular System ◽  
Digital Cellular

Resource Allocation using Dynamic Fractional Frequency Reuse

2017 ◽  
Vol 6 (1) ◽  
pp. 34-44
Author(s):  
Anitha S Sastry ◽  
Akhila S
Keyword(s):  
Resource Allocation ◽  
Spectral Efficiency ◽  
Cellular System ◽  
Frequency Reuse ◽  
Base Stations ◽  
Cellular Structures ◽  
Fractional Frequency Reuse ◽  
Ofdma System ◽  
Fractional Frequency

This article describes how a multi user cellular system insists on having increase in the spectral efficiency for the number of users and base stations. As far as cellular structures are concerned, the users at the edges experience inter cellular interference (ICI) than the users at the cell center. This is due to lack of resource allocation at cell edges. To improve the throughput at the edges a technique called Fractional Frequency Reuse (FFR) is employed. This article explores the Dynamic FFR(DFFR) in OFDMA system to improve the overall throughput.

scholarly journals Superposition Coded Modulation Based Faster-Than-Nyquist Signaling

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shuangyang Li ◽  
Baoming Bai ◽  
Jing Zhou ◽  
Qingli He ◽  
Qian Li
Keyword(s):  
Bit Error Rate ◽  
Spectral Efficiency ◽  
Detection Method ◽  
Signal To Noise Ratio ◽  
Coded Modulation ◽  
Signal To Noise ◽  
Data Rates ◽  
Orthogonal Signaling ◽  
Simulation Results ◽  
Constrained Capacity

A structure of faster-than-Nyquist (FTN) signaling combined with superposition coded modulation (SCM) is considered. The so-called FTN-SCM structure is able to achieve the constrained capacity of FTN signaling and only requires a low detection complexity. By deriving a new observation model suitable for FTN-SCM, we offer the power allocation based on a proper detection method. Simulation results show that, at any given spectral efficiency, the bit error rate (BER) curve of FTN-SCM lies clearly outside the minimum signal-to-noise ratio (SNR) boundary of orthogonal signaling with a larger alphabet. The achieved data rates are also close to the maximum data rates of the certain shaping pulse.

scholarly journals STUDI ANALISIS PENGARUH INTERFERENSI CO-CHANNEL BCCH (BROADCAST CONTROL CHANNEL) TERHADAP KUALITAS SEL SISTEM JARINGAN DCS (DIGITAL CELLULAR SYSTEM) 1800

2013 ◽  
Vol 4 (2) ◽  
Author(s):  
Setyo Budiyanto ◽  
Mariesa Aldila
Keyword(s):  
Cellular System ◽  
Control Channel ◽  
Low Level ◽  
Digital Cellular

Jumlah pelanggan telekomunikasi seluler yang terus mengalami perkembangan membuat berbagai operator mendirikan banyak BTS (Base Transceiver System) baru agar dapat melayani pelanggannya yang tersebar luas dimana-mana. Namun penambahan BTS bukanlah solusi total untuk mengimbangi jumlah pelanggan, masalah baru muncul akibat keterbatasan kanal frekuensi yang dimiliki oleh jaringan DCS 1800 sendiri. Karenanya digunakan konsep pengulangan frekuensi yang juga memungkinkan terjadinya interferensi co-BCCH sehingga target KPI yang dimiliki operator tidak tercapai.Pada penelitian ini dibahas mengenai kualitas sel di lokasi terjadi interferensi co-BCCH, hal ini menyebabkan kualitas sel tidak mencapai target KPI, ditemukan beberapa lokasi low level signal, dan TCH drop yang tinggi. Untuk mengatasi masalah tersebut kita menggunakan metode penelitian dari hasil drive test di lapangan dan selanjutnya dilakukan optimasi jaringan dengan cara frequency retune dan tilting antenna.Setelah dilakukan optimasi jaringan, dari hasil drive test after di lokasi interferensi dan juga dari KPI monitoring kita mendapatkan hasil semua indicator sudah mencapai KPI target.Kata kunci : DCS 1800, Interferensi Co-BCCH, Frekuensi, Optimasi.

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