UFMC Waveform and Multiple-Access Techniques for 5G RadCom

Abstract

In recent years, multiple functions traditionally realized by hardware components have been replaced by digital-signal processing, making radar and wireless communication technologies more similar. A joint radar and communication system, referred to as a RadCom system, was proposed to overcome the drawbacks of the conventional existent radar techniques while using the same system for intervehicular communication. Consequently, this system enhances used spectral resources. Conventional orthogonal frequency division multiplexing (OFDM) was proposed as a RadCom waveform. However, due to OFDM’s multiple shortcomings, we propose universal filtered multicarrier (UFMC), a new 5G waveform candidate, as a RadCom waveform that offers a good trade-off between performance and complexity. In addition to that, we propose multicarrier code division multiple access (MC-CDMA) as a multiple-access (MA) technique that can offer great performance in terms of multiuser detection and power efficiency. Moreover, we study how UFMC filter length and MC-CDMA spreading sequences can impact overall performance on both radar and communication separately under a multipath channel. Analysis of the bit error rate (BER) of the UFMC waveform was performed in order to confirm the experiment results.

Performance Evaluation of 5G Waveforms for Joint Radar Communication over 77 GHz and 24 GHz ISM Bands

“…The second part of our simulation consisted of examining the OFDM RadCom and UFMC RadCom systems over the 77 GHz ISM band. In [13], the system parameters were chosen following the conditions presented in Section 4. The following Table 3 sums up the system parameters: As can be noted, the difference between the two system parameters is significant.…”

“…As previously detailed in [13], the counterpart of the passband transmitted signal x pb (t) = x(t)e j2π f c t can be expressed as follows:…”

“…where z[n] denotes additive Gaussian noise with variance σ 2 z . Further details are provided in [13].…”

“…Moreover, being a simple filtered version of the OFDM waveform adds ease of implementation to MIMO techniques if needed [12]. Therefore, UFMC is proposed as a RadCom multicarrier waveform in our paper [13], compared to OFDM RadCom, and it proved to be suitable for this application by means of simulations while offering great radar and communication performance.…”

An Efficient OFDM-Based Monostatic Radar Design for Multitarget Detection

“…At the communication receiver, as usual, the received frequency-domain pilots are used to perform channel estimation using either least square (LS)-CE, minimum mean square error (MMSE)-CE, or any other channel estimation algorithms. Depending on the type of pilot arrangements, either frequency or time domain interpolation (or both) can be performed to infer the channel on the non-pilot subcarriers of each symbol [33], [48]. At the radar, which we treat in this work, the entire grid of the transmitted signal is used to perform the channel estimation [33], [48] since it knows the transmitted frames.…”