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For high data rate propagation and indoor obstacles in wireless ultra-wideband (UWB) communication systems, the signal fading and noises are influencing the performance of the wireless systems. In this paper, the rake-receiver was presented with the spread signal by time-hopping spread spectrum (TH-SS) technique. The adaptive filter used in rake-re...
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Context 1
... wireless communication systems, obstacles and signal fading are affecting on the wireless reception technique and generating multi-path components through line-of-sight (LOS) and non line-of-sight (NLOS) channels. The optimized way to collect these multiple components in reception form is rake receiver [1]. For reception of ultra-wideband signals (UWB), a modified rake receivers are used to ensure the high performance of reducing the bit error rate (BER) related to signal-to-noise ratio (SNR).The most technique to generate UWB signals is impulse radio, so that, a train of narrow pulses with less than one nanoseconds width and low duty-cycle are transmitted through short range channel models (CM1, CM2, CM3, and CM4) that presented by [2].The Federal Communications Commission (FCC) has mentioned the power spectral density (PSD) at level -41.3 dBm/MHz for spectral range of 3.1-10.6 GHz as shown in Figure 1 which is dealing with lower operating voltage and the UWB power less than 100 mW [3]. The behaviors of narrow-band and UWB in time-domain and frequency-domain are illustrated in Figure 2 according to transmission bit -1 or 1. There are multi- paths in LOS and NLOS of indoor propagation to be resolved by rake-receiver of several fingers to overcome the channel fading and reflections [4]. In rake receiver, the energy capturing of resolvable paths are done by three diversity combining schemes, all-rake, selective-rake, and partial-rake receivers [5]. Selective-rake receiver was based in this research to combine the strongest L paths out of multi-path components ...
Context 2
... wireless communication systems, obstacles and signal fading are affecting on the wireless reception technique and generating multi-path components through line-of-sight (LOS) and non line-of-sight (NLOS) channels. The optimized way to collect these multiple components in reception form is rake receiver [1]. For reception of ultra-wideband signals (UWB), a modified rake receivers are used to ensure the high performance of reducing the bit error rate (BER) related to signal-to-noise ratio (SNR).The most technique to generate UWB signals is impulse radio, so that, a train of narrow pulses with less than one nanoseconds width and low duty-cycle are transmitted through short range channel models (CM1, CM2, CM3, and CM4) that presented by [2].The Federal Communications Commission (FCC) has mentioned the power spectral density (PSD) at level -41.3 dBm/MHz for spectral range of 3.1-10.6 GHz as shown in Figure 1 which is dealing with lower operating voltage and the UWB power less than 100 mW [3]. The behaviors of narrow-band and UWB in time-domain and frequency-domain are illustrated in Figure 2 according to transmission bit -1 or 1. There are multi- paths in LOS and NLOS of indoor propagation to be resolved by rake-receiver of several fingers to overcome the channel fading and reflections [4]. In rake receiver, the energy capturing of resolvable paths are done by three diversity combining schemes, all-rake, selective-rake, and partial-rake receivers [5]. Selective-rake receiver was based in this research to combine the strongest L paths out of multi-path components ...
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Citations
... IR-UWB power in compared to other radars and wireless communications[14]. ...
Ultra-Wideband (UWB) communication has been the subject of extensive research in recent years due to its unique capabilities and potential applications, particularly in short range multiple access wireless communications. The traditional models of mobile communications desired to be improved upon in the near future because of current demand of high speed of data transmission in area networking. Internet-based streaming, video services and high definition wireless video connections within the home, office and even business environment are an essential feature of the next phase of digital transformation. Ultra-Wideband (UWB) radio technology will play a vital role in promoting these services and products with its very high speed, low cost, low power consumption and dissipation. This paper presents an insight into the WiMedia Ultra-Wideand; current status, operation, applications and possible future perspective. From these general analysis the research presents theoretical and practical findings from which are derived from proven publications within this concept.
This paper proposes the design and control of a three-phase four-wire distribution static compensator (DSTATCOM) for elimination of several power quality (PQ) issues, namely harmonics, reactive power, load unbalancing, and neutral current. A three-phase voltage source converter (VSC) and a zigzag transformer based configuration are utilized as a DSTATCOM. The zigzag transformer is operated to provide a suitable path for load neutral current and other PQ problems are mitigated by designing a suitable control for VSC. The control of VSC is developed using Euclidean direction search (EDS) technique based adaptive control theory. This control algorithm is designed to extricate fundamental constituents from the load current and used to generate switching pulses for VSC. The improved behavior of the proposed EDS-based control is observed by comparing it with other existing controllers. Real-time performance of the EDS control is verified on a developed prototype in the laboratory using VSC and DSP (dSPACE1104 R&D controller).
