This letter studies the impact of an intelligent reflecting surface (IRS) on computational performance in a mobile edge computing (MEC) system. Specifically, access point (AP) equipped with server provides MEC services to multiple Internet Thing (IoT) devices that choose offload portion their own tasks AP remaining being locally computed. We deploy IRS enhance system by intelligently adjusting phase shift each element. A joint design problem is formulated for considered assisted system,...

The flexibility in supporting heterogeneous services with vastly different technical requirements is one of the distinguishing characteristics fifth generation (5G) communication systems and beyond. One viable solution to divide system bandwidth into several parts (BWPs), each having a distinct numerology optimized for particular service. However, multiplexing mixed numerologies over unified physical infrastructure comes at cost induced interference. In this paper, we develop an analytical...

The future wireless network demands higher-level modulation to enhance spectral efficiency, which means a symbol-to-bit soft demapper with much higher complexity is required if using conventional demapping algorithm. In this paper, we proposed low-complexity for 256 QAM. Simulations show that it achieves lower the negligible performance degradation in comparison max-log-MAP demapper.

This paper proposes a new iterative frequency domain equalization (FDE) algorithm for multiple-input multiple-output (MIMO)-frequency division multiplexing (GFDM) systems. FDE scheme is capable of enhancing the system fidelity by considering complete frequency-domain second order description received signal. In addition, nulling filter design also proposed MIMO-GFDM systems to remove residual interference, which further improves compared with traditional scheme. Simulation results are...

6G wireless networks will require the flexibility to accommodate an extremely diverse set of service types. Accommodating different quality (QoS) requirements for these types necessitates use mixed numerologies, where services using subcarrier spacings or symbol durations coexist in same frequency band. Non-orthogonal multiple access (NOMA) techniques can potentially be used users with numerologies while also gaining performance benefits associated NOMA. To achieve full a numerology NOMA...

Regarded as one of the most promising transmission techniques for future wireless communications, discrete cosine transform (DCT)-based multicarrier modulation (MCM) system employs basis orthogonal functions real-modulated symbols multiplexing, by which minimum frequency spacing can be reduced half compared with Fourier transform-based one. With a time-reversed pre-filter employed at front receiver, interference-free one-tap equalization is achievable DCT-based systems. However, due to...

Network slicing has been identified as one of the most important features for 5G and beyond to enable operators utilize networks on an as-a-service basis meet wide range use cases. In physical layer, frequency time resources are split into slices cater services with individual optimal designs, resulting in services/slices having different baseband numerologies (e.g., subcarrier spacing) / or radio (RF) front-end configurations. such a system, multi-service signal multiplexing isolation among...

The future mobile networks will face challenges in support of heterogeneous services over a unified physical layer, calling for waveform with good frequency localization. Filtered orthogonal division multiplexing (f-OFDM), as representative subband filtered waveform, can be employed to improve the spectrum localization frequency-division (OFDM) signal. However, applied filtering operations impact performance various aspects, especially narrow cases. Unlike existing studies which mainly focus...

We propose channel estimation algorithms and pilot signal optimization for the universal filtered multi-carrier (UFMC) system based on comb-type pattern. By considering least square linear interpolation (LSLI), discrete Fourier transform (DFT), minimum mean error (MMSE) relaxed MMSE (RMMSE) estimators, we formulate signals problem by minimizing MSE subject to power constraint tones. The closed-form optimal solutions are derived LSLI, DFT, RMMSE estimators.

The discrete cosine transform (DCT) based multicarrier system is regarded as one of the complementary transmission techniques for 5th Generation (5G) applications in near future. By employing basis orthogonal functions multiplexing each real-valued symbol with period T, it able to reduce minimum frequency spacing 1/(2T) Hz, which only half that compared Fourier (DFT) systems. Critical optimal DCT-based design achieves interference-free single-tap equalization, not both prefix and suffix are...

This paper presents a complex-valued discrete multicarrier modulation (MCM) system based on the real-valued Hartley transform (DHT) and its inverse (IDHT). Unlike conventional Fourier (DFT), DHT cannot diagonalize multipath fading channels due to inherent properties, this results in mutual interference between subcarriers of same mirror-symmetrical pair. We explore pattern order seek an optimal solution utilize channel diversity for enhancing bit error rate (BER) performance system. It is...

The advent of mixed-numerology multi-carrier (MN-MC) techniques adds flexibilities in supporting heterogeneous services fifth generation (5G) communication systems and beyond. However, the coexistence mixed numerologies destroys orthogonality principle defined for single-numerology orthogonal frequency division multiplexing (SN-OFDM) with overlapping subcarriers uniform subcarrier spacing. Consequently, loss leads to inter-numerology interference (INI), which complicates signal impedes...

Multi-numerology multi-carrier (MN-MC) techniques are considered as essential enablers for RAN slicing in fifth-generation (5G) communication systems and beyond. However, utilization of mixed numerologies breaks the orthogonality principle defined single-numerology orthogonal frequency division multiplexing (SN-OFDM) with a unified subcarrier spacing. This leads to interference between different numerologies, i.e., inter-numerology (INI). paper develops metrics quantify level INI using...

The discrete cosine transform (DCT) based multicarrier modulation (MCM) system is regarded as one of the promising transmission techniques for future wireless communications. By employing basis orthogonal functions multiplexing each real-valued symbol with period T, it able to maintain subcarrier orthogonality while reducing frequency spacing 1/(2T) Hz, which only half that compared Fourier (DFT) systems. In this paper, following effective models by zeros are inserted guard sequence and DCT...

6G wireless networks will require the flexibility to accommodate an extremely diverse set of service types. This necessitates use mixed numerologies different quality (QoS) requirements. Non-orthogonal multiple access (NOMA) techniques can potentially be used users with while also gaining performance benefits associated NOMA. To achieve full a numerology NOMA (MN-NOMA) system, resource allocation among is paramount. However, coexistence changes nature interference that each user experiences....