Statistical Analysis of Quantization Noise in an End-to-End OFDM Link

Maduranga LIYANAGE  Iwao SASASE  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.5   pp.1376-1385
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1376
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
orthogonal-frequency-division-multiplexing (OFDM),  quantizer resolution,  quantization noise,  

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Quantization is an important operation in digital communications systems. It not only introduces quantization noise but also changes the statistical properties of the quantized signal. Furthermore, quantization noise cannot be always considered as an additive source of Gaussian noise as it depends on the input signal probability density function. In orthogonal-frequency-division-multiplexing transmission the signal undergoes different operations which change its statistical properties. In this paper we analyze the statistical transformations of the signal from the transmitter to the receiver and determine how these effect the quantization. The discussed process considers the transceiver parameters and the channel properties to model the quantization noise. Simulation results show that the model agrees well with the simulated transmissions. The effect of system and channel properties on the quantization noise and its effect on bit-error-rate are shown. This enables the design of a quantizer with an optimal resolution for the required performance metrics.