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Pilot-aided channel estimation for multi-carrier systems can be significantly improved by exploiting time and frequency correlations between the channel frequency response coefficients. But in practice, the knowledge of channel correlation function is not accurately available, thereby necessitating the need of an estimator that employs a fixed correlation function and is robust to mismatches with...
This paper provides a detailed performance comparison between both upcoming OFDM based mobile technologies for broadband radio access -3GPP UTRA LTE and mobile WiMAX (IEEE 802.16e). Based on link level simulation results, key performance indicators like physical layer throughput have been evaluated for different channel conditions and different modulation and coding schemes (MCS). Besides SISO, both...
DFT Spread OFDM has been proposed recently to reduce the Peak to Average Power Ratio (PAPR) of conventional OFDM transmission. Besides PAPR reduction, an important implication of DFT Spreading is that the independent parallel sub-channels between the sub-carriers cease to exist. This in turn leads to difference in its performance limits as compared to the conventional OFDM system. This paper analyzes...
We study waveform design, performance and power dynamics of the localized form of the single-carrier frequency-division multiple access (SC-FDMA) considered for uplink in the 3GPP long-term evolution (LTE). A classical single-carrier scheme with root-raised-cosine filtering and two DFT-based schemes are considered, one with and another without a novel spectral expansion. It is shown how to design...
Inherent inter-symbol and inter-carrier interference elimination ability of cyclic prefixed OFDM transmission fails for the case of multipath fading channels when the channel impulse response (CIR) length exceeds the duration of cyclic prefix (CP). Conventional channel estimation and equalization schemes, if applied to this case of insufficient CP, suffer significant performance degradation. We propose,...
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