Orthogonal time frequency space (OTFS) modulation is a 2-D signaling technique that has recently emerged in the literature to tackle time-varying (TV) wireless channels. OTFS deploys Doppler-delay plane multiplex transmit data where variations of TV channel are integrated over and hence equivalent relating input output system boils down time-invariant one. This can be implemented on top given multicarrier waveform with addition precoding post-processing units modulator demodulator. In this...

Due to its attractive properties, generalized frequency division multiplexing (GFDM) is recently being discussed as a candidate waveform for the fifth generation of wireless communication systems (5G). GFDM introduced form widely used orthogonal (OFDM) modulation scheme and since it uses only one cyclic prefix (CP) group symbols rather than CP per symbol, more bandwidth efficient OFDM. In this paper, we propose novel transceiver structures by taking advantage particular structure in matrix....

This paper presents a study of the candidate waveforms for 5G when they are subject to timing and carrier frequency offset. These are: orthogonal division multiplexing (OFDM), generalized (GFDM), universal filtered multicarrier (UFMC), circular filter bank (C-FBMC), linear (FBMC). We particularly interested in multiple access interference (MAI) number users transmit their signals base station an asynchronous or quasi-synchronous manner. identify source MAI these present some numerical...

Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme designed in the Doppler-delay domain to fully exploit time and frequency diversity of general time-varying channels. In this paper, we present discrete-time analysis OFDM-based OTFS transceiver with concise vectorized input-output relationship that clearly characterizes contribution each underlying signal processing block such systems. When adopting cyclic prefix domain, our reveals proposed MIMO OFDM systems have same...

The millimeter-wave (mm-wave) frequency band has emerged as a means to overcome current radio spectral limitations and represents an interesting solution fulfill the bandwidth networking requirements of fifth generation (5G) mobile communications beyond. Photonic these frequencies holds advantages over electronic methods in terms cost effective network distribution. Due their coherent nature, optical combs (OFC) are promising for efficient mm-wave frequencies. work outlined examines use OFCs...

Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mm-wave) wireless systems. The phase noise of the photo-generated mm-wave carrier limits performance such links, especially, transmission low subcarrier baud rate multi-carrier signals. In this work, we present three different techniques compensation laser frequency offset (FO) and (PN) in optical A-RoF system. first approach advocates use receiver; second uses standard digital...

This paper introduces filter bank multicarrier (FBMC) as a potential candidate in the application of massive MIMO communication. It also points out advantages FBMC over OFDM (orthogonal frequency division multiplexing) MIMO. The absence cyclic prefix increases bandwidth efficiency. In addition, allows carrier aggregation straightforwardly. Self-equalization, property that is introduced this paper, has impact reducing (i) complexity; (ii) sensitivity to offset (CFO); (iii) peak-to-average...

In this letter, we investigate the pilot contamination problem in massive MIMO networks from a system level point of view. We propose two game-theoretic approaches that model assignment problem. also prove one these games is potential game, and show adaptation processes following best better response dynamics will converge to Nash equilibrium. then as an optimization Finally, compare game theoretic results with optimal random assignments. Our simulation solution significantly outperforms...

In this paper, we explore the idea that 5G will permit use of multiple waveforms, with each service employing a waveform is best suited for it. We look at machine-type communication (MTC) scenario consisting clustered user equipment device-to-device (D2D) communication, such as smart factory intercommunicating machinery. The overhead associated synchronizing large number D2D (DUE) comes cost may render synchronous infeasible or undesirable. Based on motivation, consider possible combinations...

Fifth generation (5G) mobile communications will require a dense deployment of small cell antenna sites and higher channel bandwidth, in conjunction with cloud radio access network (C-RAN) architecture. This necessitates low latency high-capacity architecture addition to energy- cost-efficient fronthaul links. An efficient way achieving such connectivity is make use an optical-fiber-based infrastructure where multiple wireless services may be distributed over the same fiber remote head (RRH)...

In this letter, we propose timing offset (TO) and carrier frequency (CFO) estimators for orthogonal time space modulation (OTFS). The proposed do not require any additional training overheads as they deploy the same pilot signal that is used channel estimation. Hence, no overhead required synchronization, thanks to periodic properties of in delay-time domain. Our TO estimator finds start each OTFS block by searching a sequence delay dimensions. CFO then estimated finding mean angles...

Millimeter-wave communications may be harnessed to help meet future 5G network bandwidth requirements, but the generation of these frequencies in electronic domain can difficult and costly. Photonic techniques, such as optical heterodyning, exploited generate millimeter-wave a manner which is efficient compatible with fiber transport infrastructure. In this letter, analog radio-over-fiber transmission five bands UF-OFDM, heterodyning around 60 GHz, experimentally demonstrated over 25 km...

Similar to the widely used orthogonal frequency division multiplexing systems, generalized suffers from a high peak-to-average power ratio (PAPR). In this letter, we propose data-independent precoder minimize variance of instantaneous (IP), subject constraint unchanged average IP as means for PAPR reduction. Simulation results show that proposed can reduce without any increase in out band radiation or bit error rate degradation. Compared with existing solutions, technique provides an...

The provision of both wireless and wired services in the optical access domain will be an important function for future passive networks (PON). With emergence 5th generation (5G) mobile communications, a move toward dense deployment small cell antenna sites, conjunction with cloud radio network (C-RAN) architecture, is foreseen. This type architecture greatly increases requirement high capacity fronthaul backhaul links. An efficient way achieving such connectivity to make use wavelength...

GFDM (Generalized Frequency Division Multiplexing) is a multicarrier modulation technique that being proposed as potential candidate for the fifth generation of wireless communication systems (5G). Due to fact uses only one cyclic prefix (CP) group symbols rather than CP per symbol and it has well contained spectral properties, more bandwidth efficient widely used OFDM modulation. In this paper, we propose novel receiver designs by taking advantage particular structure in matrix. A unified...

GFDM (generalized frequency division multiplexing) is a non-orthogonal waveform that being discussed as candidate for the fifth generation of wireless communication systems (5G). multicarrier technique with circular pulse shaping designed in way to address emerging applications 5G networks such Internet Things (IoT) and machine-to-machine communications (M2M). The same other systems, suffers from high peak average power ratio (PAPR). To attack PAPR problem, this paper, we propose polynomial...

This paper proposes a novel modulation technique called globally filtered orthogonal time frequency space (GF-OTFS) which integrates single-carrier division multiple access (SC-FDMA)-based delay-Doppler representation with universal multi-carrier (UFMC) modulation. Our proposed first arranges the frequency-Doppler bins of an (OTFS) frame in adjacency using SC-FDMA and then applies filtering to neighboring signals mitigate inter-Doppler interference (IDI). By employing this approach, GF-OTFS...

Orthogonal time frequency space (OTFS) is a strong candidate waveform for sixth generation wireless communication networks (6G), which can effectively handle varying channels. In this paper, we analyze the effect of fractional delay in Doppler (DD) domain multiplexing techniques. We develop vector-matrix input-output relationship DD data transmission system by incorporating effective pulse shaping filter between transmitter and receiver along with channel. Using relationship, on channel...

We perform an asymptotic study on the performance of filter bank multicarrier (FBMC) in context massive multi-input multi-output (MIMO). show that signal-to-interference-plus-noise ratio (SINR) cannot grow unboundedly by increasing number base station (BS) antennas, and is upper bounded a certain deterministic value. This result correlation between multi-antenna combining tap values channel impulse responses terminals BS antennas. To solve this problem, we introduce simple FBMC prototype...

A 5G millimeter-wave radio over fibre optical fronthaul system based on heterodyning, utilising an externally injected gain switched distributed feedback laser, is successfully demonstrated. Five bands of UF-OFDM are transmitted 25 km and a 28 GHz Vivaldi Antenna wireless link. Transmission performance below the 7% FEC limit achieved with aggregate total data rate 4.56 Gb/s.

We perform an asymptotic study of the performance filter bank multicarrier (FBMC) in context massive multi-input multi-output (MIMO). show that effects channel distortions, i.e., intersymbol interference and intercarrier interference, do not vanish as base station (BS) array size increases. As a result, signal-to-interference-plus-noise ratio (SINR) cannot grow unboundedly by increasing number BS antennas, is upper bounded certain deterministic value. this phenomenon result correlation...

In this paper, we design receivers for filter bank multicarrier-based (FBMC-based) massive MIMO considering practical aspects such as channel estimation and equalization. particular, propose a spectrally efficient pilot structure technique in the uplink to jointly estimate all users' impulse responses. We mathematically analyze our proposed estimator find statistics of errors. These are incorporated into equalizers deal with imperfect state information (CSI) effect. revisit equalization...