Blind Synchronization in Asynchronous UWB Networks Based on the Transmit-Reference Scheme

Blind Synchronization in Asynchronous UWB Networks Based on the Transmit-Reference Scheme

Djapic, R.
Leus, G.
Van Der Veen, A.J.
Trinda, A.

Electrical Engineering, Mathematics and Computer Science

2006

Ultra-wideband (UWB) wireless communication systems are based on the transmission of extremely narrow pulses, with a duration inferior to a nanosecond. The application of transmit reference (TR) to UWB systems allows to side-step channel estimation at the receiver, with a tradeoff of the effective transmission bandwidth, which is reduced by the usage of a reference pulse. Similar to CDMA systems, different users can share the same available bandwidth by means of different spreading codes. This allows the receiver to separate users, and to recover the timing information of the transmitted data packets. The nature of UWB transmissionsshort, burst-like packetsrequires a fast synchronization algorithm, that can accommodate several asynchronous users. Exploiting the fact that a shift in time corresponds to a phase rotation in the frequency domain, a blind and computationally effcient synchronization algorithm that takes advantage of the shift invariance structure in the frequency domain is proposed in this paper. Integer and fractional delay estimations are considered, along with a subsequent symbol estimation step. This results in a collision-avoiding multiuser algorithm, readily applicable to a fast acquisition procedure in a UWB ad hoc network.

http://resolver.tudelft.nl/uuid:1ceaa400-0603-41cf-a460-68deab6433f4

Hindawi Publishing Corporation

1687-1499

EURASIP Journal on Wireless Communications and Networking, 2006

Institutional Repository

journal article

(c) 2006 Djapic, R.; Leus, G.; Van Der Veen, A.J.; Trinda, A.