Time and frequency synchronization for OFDM using PN-sequence preambles

Summary, in English

Fast and reliable time and frequency synchronization is crucial for packet-based orthogonal frequency division multiplex (OFDM) systems. In this paper we compare and analyze preambles for OFDM systems based on repeated OFDM data symbols or repeated short pseudonoise sequences (PN-sequences). We make an analytical evaluation for AWGN channels and simulate the performance in oneand two-tap Rayleigh fading channels. The PN-based preamble gives better detection properties in terms of lower false detection probability and lower probability of missing the synchronization signal. The PN-based preamble has low peak-to-average power ratio and it makes it possible to use an ADC with one-bit quantization in stand-by mode. For frequency offset estimation both preambles give similar performance, but the PN-based preamble allows for a greater reduction in stand-by mode power consumption

• Författare: Fredrik Tufvesson; Michael Faulkner; Ove Edfors
• Avdelning/ar: Institutionen för elektro- och informationsteknik
• Publiceringsår: 1999
• Språk: Engelska
• Sidor: 2203-2207
• Publikation/Tidskrift/Serie: Proceedings of IEEE Vehicular Technology Conference, Amsterdam, The Netherlands, September 19-22, 1999
• Volym: 4
• Länkar: http://dx.doi.org/10.1109/VETECF.1999.797329
• Dokumenttyp: Konferensbidrag
• Förlag: IEEE - Institute of Electrical and Electronics Engineers Inc.
• Ämne: Electrical Engineering, Electronic Engineering, Information Engineering
• Nyckelord: wireless LAN; synchronisation; spread spectrum communication; quantisation (signal); pseudonoise codes; probability; OFDM modulation; AWGN channels; data communication; Rayleigh channels; frequency estimation; packet radio networks
• Conference name: IEEE VTS 50th Vehicular Technology Conference, VTC 1999 - Fall.
• Conference date: 1999-09-19 - 1999-09-22
• Conference place: Amsterdam, Netherlands
• Status: Published
• ISBN/ISSN/Övrigt: ISBN: 0-7803-5435-4