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4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role...
We first experimentally demonstrated a digital mobile fronthaul (MFH) architecture using delta-sigma modulation as the new digitization interface to replace the conventional common public radio interface (CPRI). Both one-bit and two-bit delta-sigma modulations were demonstrated, and the digitized signals were transmitted over on-off keying (OOK) or 4-level pulse-amplitude-modulation (PAM4) optical...
As the perpetually increasing demands of users for high speed, higher data rates over wide bandwidths, lower system latencies in mobile communications, LTE/LTE-Advanced as a 4th Generation of Wireless networks infrastructures widely deployed to provide better support for these requirements. Carrier Ag-gregation(CA) is an important technology for LTE-A providing enhancements to peak data rates, both...
A WDM-PON system managed with an electrically embedded pilot tone to accommodate mobile fronthaul is proposed. Experimental results show a 128 kb/s pilot tone can be inserted into the low frequency area of CPRI signals with negligible insertion penalty.
This paper deals with the performance assessment of the Long Term Evolution (LTE)-Advanced Release 12 physical downlink channel, emphasizing on the Carrier Aggregation (CA) technology and its recent advances, such as the challenging interband non-contiguous solution. By processing the LTE-Advanced waveforms in the time domain (instead of the more common baseband), we describe the underlying system...
In this paper simple model for cell size calculations in LTE downlink at 800 MHz frequency band is given. Based on Okomura-Hata propagation model, the equation for maximal cell radius is calculated taking into account: the height and gain of both base and mobile station antenna, transmitter power and losses, receiver sensitivity, and multipath fading effects. Numerous simulations have been performed...
This paper presents an approach to apply congestion exposure concepts to mobile wireless communication, with a particular focus on LTE's E-UTRAN. Assuming Re-ECN as the congestion exposure mechanism, we show how the different functional Re-ECN components can be mapped to logical elements in the E-UTRAN architecture. Moreover we present a novel concept of Wireless ECN, which allows for generating congestion...
In this paper the performance of multiple-input multiple-output (MIMO) system in the UTRAN Long Term Evolution (LTE) standard is evaluated by means of ergodic system capacity in low (3 km/h), medium (30 km/h) and high (120 km/h) mobility scenarios. The impact of adaptive modulation as well as Hybrid ARQ (HARQ) with Chase Combining to the distribution of effective SINR is established analytically and...
The new design features of mobile communication are described. The LTE technology transceiver for a “downlink” line for frequency division duplex of channel with fading is considered. The scheme showing dependence of the signal - noise ratio for different kinds of modulation is considered.
This paper considers the Multiple Input Multiple Output (MIMO) capacity enhancement considering the Universal Mobile Telecommunication System (UMTS) Long Term Evolution (LTE) technology, in the downlink, including the effects of system bandwidth and Signal-to-Noise Ratio (SNR) efficiency. Firstly, the system bandwidth efficiency is calculated for LTE framework. Then, the SNR efficiency using Adaptive...
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