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In an OFDM system, known symbols referred to as pilot are transmitted across the time-frequency plane for the receiving device to estimate the channelpsilas time-frequency response in order to perform coherent demodulation of data symbols. The placement of these pilot symbols largely falls into two categories, namely, the regular and irregular patterns. Inspired by synchronization techniques used...
In the downlink of an Orthogonal Frequency Division Multiplexing (OFDM) system, pilot symbols are transmitted across the time-frequency plane for the receiving device to estimate the channel's response. The density of such pilot is often designed to accommodate the devices under most extreme channel conditions. This worst case scenario design results in unnecessary overhead that could have been used...
A fixed beam (FB) system that uses a beam specific secondary-common pilot channel (S-CPICH) as a phase reference for channel estimation and demodulation in WCDMA is evaluated in a dynamic radio network simulator. The impact of the angular spread on the downlink (DL) system performance is analyzed. Furthermore, various scrambling code allocation strategies and an adaptive load-dependent power tuning...
In this paper, single carrier frequency domain equalization with space time transmit diversity was implemented and evaluated in real-time using a DSP-based wireless MIMO test-bed. The implemented schemes supported a large set of modulations, from BPSK up to QAM64. Zero padding is introduced to mitigate inter-block interference. Robust time and frequency synchronization together with channel estimation...
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