SINR analysis of time and frequency offsets in OFDM systems
Local Computer Networks（2011）
摘要
In this paper, the impact of both time offsets (TOs) and carrier frequency offsets (CFOs) on the average output signal-to-interference-plus-noise ratio (SINR) in a frequency selective channel is investigated with a novel approach. First, TOs are partitioned into Ave cases based on how they occur. Then the mathematical models for different cases are derived. Considering CFOs and benefiting from the obtained models, closed-form expression for the SINR in each case is derived. It is proved that, SINR is independent of the observed subcarrier for the given TO and CFO. Besides, it is shown that the performance of the affected system deteriorates rapidly as the number of subcarriers increases. It is also revealed that, as far as the guard interval is longer than the channel delay spread, the SINR is not much sensitive to the number of channel taps and power delay profile.
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关键词
power delay profile,frequency selective channel,mathematical models,orthogonal frequency-division multiplexing (ofdm),channel delay spread,time offset,affected system,ofdm modulation,synchronization-errors,mathematical analysis,telecommunication channels,carrier frequency offsets,signal-to-interference-plus-noise ratio,ofdm system,carrier frequency offset,different case,channel taps,ofdm systems,signal-to-interference-plus-noise ratio (sinr),guard interval,average output signal-to-interference-plus-noise ratio,sinr analysis,closed-form expression,channel tap,channel delay,time offsets,discrete fourier transform,mathematical model,frequency offset,ofdm,signal to interference plus noise ratio,synchronization,time frequency analysis,interference,signal to noise ratio
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