Pongsatorn Sedtheetorn

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In this paper, we propose a joint throughput maximisation across the physical and call admission control (CAC) layer for multi-class VSG CDMA systems in a Rayleigh fading environment. The system model is firstly analysed and a new exact closed-form of the physical layer constraint is derived. We show that it is possible to transform the set of the exact(More)
—A new accurate mathematical analysis is presented for the efficient computation of the spectral efficiency of CDMA downlink wireless communication systems in the presence of multipath Rayleigh fading and log-normal shadowing. A new explicit expression is derived for the spectral efficiency, which is based on an accurate interference model that accounts for(More)
In this paper, theoretical analysis on the downlink spectral efficiency of non-orthogonal multiple access (NOMA) in Nakagami fading is introduced. Thanks to our accurate analytical technique, a closed-form expression of NOMA is proposed. With the closed form, the exact average of the spectral efficiency can be achieved at different user power allocations(More)
In this paper, an efficient analytical technique for bit error rate (BER) of variable spreading gain code division multiple access (VSG CDMA) in Nakagami fading is introduced. Based on the accurate improve Gaussian approximation (IGA) technique, a new BER expression is derived in a closed form. Validated by Monte Carlo simulation, the proposed expression is(More)
—This paper presents a new linear programming approach for throughput maximization on the uplink of a multiclass variable spreading gain code-division multiple-access (CDMA) multicellular system in Rayleigh fading for both binary phase-shift keying (BPSK) and quaternary phase-shift keying (QPSK) modulations. Based on the improved Gaussian approximation(More)
This paper presents an original exact analysis on the downlink spectral efficiency of DS/CDMA cellular systems in Rayleigh fading. We derive a new expression for the probability distribution function of signal to interference plus noise ratio (SINR) which accordingly leads us to propose explicit closed forms of he spectral efficiency and average bit error(More)
In this paper, an original analysis on the uplink spectral efficiency of non-orthogonal multiple access (NOMA) in Nakagami fading channel is introduced. Based on our exact evaluation, a closed-form expression of the spectral efficiency is proposed. Distinguished from the literature, the proposed expression yields accurate numerical results, validated by the(More)
Deployment of a femto cell network is one of the best ways to solve the areas which have some dead spots for wireless communication in macro cell network. However, we have to concern interferences because femto cells often share the same spectrum, which is calles as co-channel deployment, with their macro cell due to limitation. In this paper, we focus on(More)
In this paper, theoretical analysis on co-channel deployment of a femto cell network in Rayleigh fading is addressed. It is well known that co-channel deployment is useful in terms of capacity improvement but it impacts on the signal degradation. Therefore, the major challenge is on the tradeoff between the capacity enhancement and signal deterioration.(More)