Transparent Tx and Rx Waveform Processing for 5G New Radio Mobile Communications

Abstract

Several different waveform processing techniques have been studied and proposed for the 5G new radio (NR) physical layer, to support new mixed numerology and asynchronous services. The evaluation and comparison of these different techniques is commonly based on matched waveform processing in the transmitter and receiver units. In this article, it is shown that different techniques can be flexibly mixed, allowing to separately optimize complexity-performance tradeoffs for transmitter and receiver implementations. Mixing of different waveform processing techniques is possible by setting adequate requirements for transmitter and receiver baseband processing allowing transparent design. The basic framework of how transmitter and receiver units can be independently applied and evaluated in the context of transparent design and an extensive set of examples of the achievable radio link performance with unmatched transmitter and receiver waveform processing are provided. The discussed approach and solutions simplify standardization, improve transparent transmitter and receiver coexistence, and allow future-proof evolution path for performance improvements in 5G NR physical layer hardware and algorithm design.

PAPR Reduction With Mixed-Numerology OFDM

“…With the evaluated parameters, shown in Table I, and when compared to I-ICEF, the number of real multiplications is increased by 45% or 18% with E-ICEF or FC-ICEF, and the number of real additions is increased by 50% or 16% with E-ICEF or FC-ICEF, respectively. In these comparisons, only the PAPR reduction complexity is considered, whereas the complexity of WOLA and FC processing is analyzed and compared in [3], [11].…”

SDR Prototype for Clipped and Fast-Convolution Filtered OFDM for 5G New Radio Uplink

“…Furthermore, FC-F-OFDM also provides a very good TX MSE performance. As another important benefit, FC-F-OFDM TX or RX processing is directly compatible with CP-OFDM TX or RX processing, respectively [21]. Furthermore, FC filtering can be used with single-carrier or precoded OFDM-based waveforms and their variants such as [22], [23].…”

SINR‐based adaptive MIMO FBMC/OQAM transmission with automatic modulation classification

“…FBMC/OQAM is a special filter bank multicarrier transmission scheme, in which the real and imaginary parts of complex-valued quadrature-amplitude modulated (QAM) symbols s n, = [s n, ,1 , … , s n, ,m , … , s n, ,M t ] T (1) are transmitted in an interleaved manner 8 (see top of Figure 2), where n, , m, and M t denote the subcarrier index, block index, the MIMO substream index, and the number of MIMO substreams, respectively. For notational convenience, FBMC/OQAM is treated as a pulse-amplitude modulated (PAM) transmission scheme with real-valued symbols a n,k = [a n,k,1 , … , a n,k,m , … , a n,k,…”

“…Aiming at a higher spectral efficiency compared to the well‐established cyclic prefix orthogonal frequency division multiplexing (CP‐OFDM) technique, a couple of new physical waveforms have been intensively studied in the last years . Most prominent examples that improve the poor side‐band suppression of CP‐OFDM and/or reduce the amount of redundancy by the cyclic prefix are filtered OFDM (f‐OFDM), universal‐filtered multicarrier modulation (UFMC), also named universal‐filtered OFDM, and generalized frequency division multiplexing (GFDM) .…”