A simple digital fading simulator for mobile radio

Casas, E.; Leung, Cyril

doi:10.1109/25.131001

Cited by 29 publications

(5 citation statements)

References 3 publications

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“…Hardware-based fading simulators using analog or digital components [2,5,8,45] can be used, but these have traditionally been point-to-point simulators. Commercial channel emulators also fall in this category [12].…”

Section: Related Workmentioning

confidence: 99%

Experience with a wireless network testbed based on signal propagation emulation

Borries

Wang

Judd

et al. 2010

2010 European Wireless Conference (EW)

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The evaluation of wireless research is challenging because signals traveling through the ether are affected by the physical environment, including movement by people and objects. As a result, testbed experiments are hard to control and are non-repeatable. We have developed a wireless networking testbed based on digital signal propagation emulation that provides control over the signal propagation environment. The testbed has been in regular use for research and education since early 2007. In this paper we present measurements illustrating the properties of the emulator testbed. We also compare the results of various experiments on the emulator with simulation results to shed some light on when the increased accuracy of the emulator testbed is important. Finally, we use the experience gained on the emulator to identify classes of experiments for which the emulator is well suited, compared with other evaluation platforms.

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Section: Related Workmentioning

confidence: 99%

Experience with a wireless network testbed based on signal propagation emulation

Borries

Wang

Judd

et al. 2010

2010 European Wireless Conference (EW)

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“…For the modeling of the Rayleigh fading channel, two approaches have been considered. Jakes [33] describes and Casas et al [34] implement in hardware a technique referred to as "sum of sinusoids" for simulating Rayleigh fading using the summation of several low-frequency sinusoids with regularly spaced phase differences. An alternative approach performs complex addition of two band-limited quadrature additive white Gaussian noise (AWGN) sources, a solution advocated for example by Arredondo et al [35] and Goubran et al [36].…”

Section: Simulation Modelmentioning

confidence: 99%

Latency and networking aspects of adaptive modems over slow indoors Rayleigh fading channels

Torrance

Hanzo

1999

IEEE Trans. Veh. Technol.

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Adaptive modulation exploits the time-variant channel capacity fluctuation of fading channels using a range of different modem modes. Specifically, no information is transmitted when the instantaneous channel signal-to-noise ratio (SNR) is low, and, hence, during this period the data must be buffered, which results in delay or latency. When the instantaneous channel quality improves, 2-, 4-, 16-, and 64-level modem modes are invoked, which allows the transmission buffer to be emptied. It is shown that channel capacity gains are achieved at the cost of some latency penalty. The latency is quantified in this treatise and mitigated by frequency hopping or statistical multiplexing. The latency is increased when either the mobile speed or the channel SNR are reduced, since both of these result in prolonged low instantaneous SNR intervals. It is demonstrated that as a result of the proposed measures, typically more than 4-dB SNR reduction is achieved by the proposed adaptive modems in comparison to the conventional benchmark modems employed.

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“…A baseband signal is used to modulate an ICOM-2AT FM transmitter. The RF signal is passed through a Rayleigh fading channel simulator [22]. The output from the fading simulator is passed through a step-wise variable attenuator and combined with the output of an RF noise source.…”

Section: A Analog Fm Fading Channelmentioning

confidence: 99%

OFDM/FM frame synchronization for mobile radio data communication

Warner¹,

Leung

1993

IEEE Trans. Veh. Technol.

Self Cite

112

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A synchronization scheme enabling the use of orthogonal frequency division multiplexing OFDM/FM over a mobile radio channel in a pure ALOHA environment is proposed. The scheme encodes synchronization information in parallel with data in the same manner in which data is encoded in the OFDM/FM frame. The synchronization information is in the form of tones, centered in certain reserved frequency sub-channels of the OFDM signal. The receiver uses a correlation detector, implemented in the frequency domain, to acquire synchronization accurately on a packet-by-packet basis. Experimental results indicate that the bit-error-rate performance achievable with the proposed scheme is within 1.5 dB of the performance obtained with ideal synchronization. In general, the number of bits assigned to each sub-carrier can vary from one sub-carrier to the next [ll].

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A simple digital fading simulator for mobile radio

Cited by 29 publications

References 3 publications

Experience with a wireless network testbed based on signal propagation emulation

Experience with a wireless network testbed based on signal propagation emulation

Latency and networking aspects of adaptive modems over slow indoors Rayleigh fading channels

OFDM/FM frame synchronization for mobile radio data communication

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