The reconstruction of the state of the transmitter's chaos signal source in the receiver and transmitted information decoding is possible only if the structure and all parameters of the chaotic oscillator are known, and they are synchronized. Chaotic synchronization improves communication security but decreases resistance to channel noise as a trade-off. The modulation schemes that refer to this group are chaos shift keying (CSK) [32], quadrature chaos shift keying (QCSK) [33], chaos-based code division multiple access (CDMA) [34], and chaotic pulse-position modulation (CPPM) [35]. Due to their wideband nature, narrow autocorrelation function, and low cross-correlation, chaotic signals exhibit relatively good noise immunity and resistance to multipath prop agation and multiuser interference, as shown [36; 37; 38; 39; 40; 41; 42; 43]. For noise immunity of chaotic communication systems with coherent detection, the performance of the synchronization method is important. For instance, the emphasis on developing an adaptive and noise-robust method of multi-state chaotic synchronization was made in [44] with two non-identical chaos generators (Chen and Chua circuits). In turn, the study [45] analyzes the performance of a novel DCSK chaotic communication system in a Rayleigh channel, concluding that such a system can provide acceptable multipath resistance for up to four simultaneous users. Regardless of the increasing interest in chaos application in WSN and IoT [46; 47; 48; 49; 50] in recent years, there are still many challenges in chaotic communication systems, especially considering noise immunity, multipath propagation resistance, and multiuser interference issues. Therefore, it is crucial to perform research in this area and discover more potential advantages of chaotic communication systems, especially for application in WSN. It should also be noted that, judging by the amount of literature, digital chaotic communication systems based on chaotic maps, as well as non-coherent detection chaotic systems, have been studied much more than coherent detection systems based on continuous-time chaos oscillators [29; 36; 38; 39; 41; 45; 51; 52]. This leads to the conclusion that multipath propagation and phase noise impact on the communication systems with chaotic oscillators' employment are insufficiently investigated. Therefore, the present work studies the performance of two novel coherent chaos data transmission systems: frequency-modulated chaos shift keying (FM-CSK) and quadrature chaos phase-shift keying (QCPSK), which are proposed by the authors in [53] and [54], respectively. While the previous works have demonstrated the developed prototypes of the two systems, this one focuses on studying the performance of the FM-CSK and QCPSK in the multipath propagation conditions, additive white Gaussian noise (AWGN) impact, and phase noise's effect on the communication quality. To present a comprehensive analysis, the results for the two systems are compared to their non-chaotic counterparts: frequency-shift keying (FSK) and quadrature amplitude modulation (QAM). This paper consists of 5 sections. Section 2 explains the concepts and structure of the proposed FM-CSK and QCPSK communication systems and the core element of systems--Vilnius chaos oscillator, as well as the hardware implementation of both communication systems. In Section 3, the results of the multipath propagation study are shown. Section 4 presents the analysis of phase noise's impact on transmission quality. Section 5 concludes the paper.