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A novel cell search scheme based on coherent sequence detection and sign decision is proposed in this paper. The given structure of the SCH (synchronization channel) allows the UE (user equipment) to detect cell ID with low complexity, and the adverse effects of the channel fading and frequency offset are eliminated in the three search steps. The performance of the scheme is investigated in various...
In this paper we investigate the time and frequency synchronization as well as the sector and cell search for the 3GPP long term evolution (LTE) downlink. The proposed algorithms rely on the synchronization and cell-specific reference signals and are hence compliant to most recent 3GPP specifications. Time and (fractional) frequency offset coarse synchronization are performed in the time domain with...
In SC-FDE (single carrier with frequency domain equalization) systems, timing offset brings ISI (inter-symbol interference). In order to obtain better timing precision in multi-path, a new timing offset estimation method applied to SC-FDE systems is proposed based on the analysis of Schmidl & Coxpsilas and Minnpsilas algorithms. By designing new training symbols and introducing corresponding calculation...
Single-carrier (SC) transmission using frequency domain equalization (FDE) is one of the candidates for the next generation mobile communication systems expected to deliver high-speed and high-quality packet data services. Fast synchronization is critical for the performance of packet transmission systems. In this paper, a robust timing synchronization scheme for SC-FDE packet transmission is presented...
This paper addresses the problem of synchronisation and data demodulation for impulse radio ultrawideband systems. A novel non-coherent non-data aided joint synchronization and data demodulation algorithm is proposed. The scheme consist of a coarse estimation phase which is performed over a single symbol period, followed by a fine synchronization stage that estimates the timing with high accuracy...
This paper describes the design and verification of IEEE 802.22 WRAN physical layer. The WRAN physical layer is fundamentally based on the IEEE 802.16e system, but the OFDMA parameters including preamble structure and pilot pattern are newly designed by considering the WRAN channel environments. In this paper, we present the simulation models and results by using appropriate synchronization and channel...
This paper presents a novel frequency synchronizator for orthogonal frequency division multiplexing (OFDM) systems over multipath fading channels. With the help of pilot chips and channel estimates in frequency domain, we can analyze the delay power spectrum (DPS) of multipath channels and estimate the integer carrier frequency offset (CFO). Furthermore, the pseudo noise (PN) pilot chips are proposed...
For T-DMB service, it requires a relay system such as the digital on-channel repeater which is usually called gapflller to deal with radio wave shadowing region and additional coverage. In this paper, we propose a new architecture of T-DMB gapflller and algorithms for the proposed architecture.
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
Correlative minimum shift keying (MSK), a second order polynomial modulation scheme known as tamed frequency modulation (TFM), is a constant envelope type of modulation with a perfect peak to average power ratio (PAPR), besides the property of low out of band power. We apply the linearized TFM to the single carrier transmission with frequency domain equalization (SC/FDE) concept. We then obtain a...
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