Statistical model of delay spread and coherence bandwidth for wide-band PCS at millimeter-waves in an urban mobile radio environment
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A MM wave propagation model, based on multi-ray optical theory and the geometrical theory of diffraction (GTD), is used to statistically study the delay spread and coherence bandwidth (B/sub c/) for wide-band personal communication services (PCS) in urban mobile radio environment. The statistical model results are compared with measurements and they agree that, for outdoors near street level, B/sub c/ is varying over a range of frequencies (14-100 MHz). It is shown that the B/sub c/ distribution depends on antenna heights, street layout, and frequency. The signal level statistics are evaluated which also agree with the measurements that, in general, the statistics are non-Rayleigh distributed.Keywords:
Coherence bandwidth
Extremely high frequency
Rayleigh distribution
Radio spectrum
Coherence bandwidth
Wideband
Coherence time
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In this work, useful measurement results of the propagation channel characteristics in an indoor office environment at 26 GHz are presented. The parameters of both the floating-intercept (FI) and close-in (CI) free space reference distance path loss models have been derived from channel measurements. The time dispersion characteristics have been analyzed in terms of both the root-mean-square (rms) delay spread and the coherence bandwidth. These results allow us to have a better knowledge of the propagation channel characteristics and can be also used to evaluate the performance of fifth generation (5G) networks in indoor office scenarios.
Coherence bandwidth
Wideband
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This paper reports the measurement and analysis of a wideband radio channel at 1900 MHz within a special propagation environment such as the Olympic Stadium of Athens. RMS delay spread values are evaluated as well as the coherence bandwidth of the channel is derived by the frequency correlation function. The mean delay spread is found to be 0.314 /spl mu/s and 0.731 /spl mu/s for LOS and NLOS conditions respectively. The mean coherence bandwidth that characterizes the entire area reaches 3.463 MHz providing wide transmission data rates. The correlation bandwidth is found to be inversely proportional to the RMS delay spread and modeled in a minimum mean square error sense.
Coherence bandwidth
Non-line-of-sight propagation
Wideband
Power delay profile
Coherence time
Root mean square
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This paper reports the measurement and analysis of a wideband radio channel at 1.89 GHz within a suburban propagation environment. Mean delay spread was found to be 2.000 /spl mu/s and 1.928 /spl mu/s for LoS and NLoS conditions respectively. The coherence bandwidth that characterizes the area varies from 123 kHz in NLoS cases to 103 kHz in LoS cases, providing significant data rates. Measured delay spread was found to be highly variable with increasing separation between transmitter and receiver. Finally, coherence bandwidth is found to be inversely proportional to the RMS delay spread and modeled in a minimum mean square error sense.
Non-line-of-sight propagation
Coherence bandwidth
Wideband
Coherence time
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Contemporary communications are predominantly wireless. Wireless systems propagation parameters are greatly influenced by multipath fading, even more so in an "indoor" environment. Theoretical parameters commonly used for describing multipath are coherence bandwidth and multipath delay spread. The goal of this paper is presentation of results of impulse response measurements in 2.4-GHz frequency band, conducted inside FESB building, using vector analyzer method. From the obtained channel impulse response delay spread was calculated, and the estimate of coherence bandwidth was made. Measurements were divided in four sets, each showing fair correlation of coherence bandwidth and delay spread results.
Coherence bandwidth
Power delay profile
Wideband
Impulse response
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This paper analyses the suitability of RMS delay spread and coherence bandwidth when characterising system quality-of-service of QPSK operating in a variety of wideband mobile channels. The most common technique for characterising the wideband channel is to calculate the RMS delay spread. Analytical development and simulation studies indicate that the presence of relatively low power signals with large excess delay has a much greater effect on the RMS delay spread than is reflected by a negligible change in system performance. Simulation models and analysis indicate that coherence bandwidth is not unduly influenced by the presence of negligible rays at a large excess delay. For the channel models under test, employing coherence bandwidth as a performance prediction parameter is more successful than the use of RMS delay spread.
Coherence bandwidth
Wideband
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This paper presents a novel statistical characterization of the indoor low-voltage (LV) narrowband power line communication (PLC) channel in CENELEC and FCC/ARIB bands. Experimental measurements of electrical network complex transfer functions were used to determine, for the frequency range up to 500 kHz, the statistics of the average channel gain, the delay spread parameters, the coherence bandwidth and the channel capacity. The average measured channel attenuation exhibits values between 16.36 and 26.95 dB with a mean of 20.75 dB in the frequency band from 10 to 500 kHz. The root mean square (rms) delay spread has a mean value of 2.12 μs with 90% of the channels revealing values below 3.20 μs. The minimum coherence bandwidth at 0.9 correlation level is of 1.23 kHz and the mean channel capacity is of 5.32 Mbps. The lognormal behavior is confirmed and justified for the rms delay spread but not for the average channel gain. The negative correlation between these two parameters is examined, and the relationships between the different studied metrics are also explored.
Coherence bandwidth
Narrowband
Root mean square
Power delay profile
Coherence time
Frequency band
Wideband
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This paper describes the small scale performances of a 60 GHz channel in an underground mine and in an indoor laboratory using the same channel sounder. The frequency domain channel measurements have been carried out in the 59 GHz to 61 GHz frequency band. Based on the measurements, the two environments are characterized and compared in terms of delay spread, coherence bandwidth. The values of the delay spread are less than 3 ns for both environments. Finally a relationship between the delay spread and the coherence bandwidth is found for both scenarios.
Coherence bandwidth
Frequency band
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In this paper, experimental broadband propagation measurements in a typical sea port scenario at 5.8 GHz are presented. Measurements were performed in Cádiz Bay, Spain, by sounding the channel with a periodic pulsed signal, from which power delay profiles (PDPs) were estimated for several locations. The study focuses on propagation scenarios based on low-height antenna deployments. Experimental PDPs are found with a spiky shape that can be explained from the nature of the environment. This result is significantly different from the one expected in other regular environments (urban, indoor, etc.) where continuous shaped profiles are common. Furthermore, time-dispersive parameters, such as mean delay, delay spread, and coherence bandwidth, are extracted. The estimated values for mean delay and delay spread remain small, which indicates that the channel can be regarded as flat for typical low-bandwidth signals employed over the sea. In fact, the median value for coherence bandwidth is found to be 8 MHz, hence these channels are suitable to support relatively high data rates by using simple communication systems.
Coherence bandwidth
Power delay profile
Channel sounding
Antenna height considerations
Coherence time
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This work presents measurement results and characterization of a wideband radio channel at 60 GHz in an indoor environment. Time delay values are evaluated while the coherence bandwidth of the channel is derived by the frequency correlation function. The mean excess delay ranges from 1.13 to 29.26 ns and the rms delay spread from 4.28 to 35.92 ns for the entire laboratory environment. The coherence bandwidth of the channel yielded for 0.9-correlation varies from 3.77 to 49.37 MHz with a mean value of 19.08 MHz.
Coherence bandwidth
Wideband
Coherence time
Power delay profile
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