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All-digital PPM impulse radio for multiple-access through frequency-selective multipath

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2 Author(s)
Le Martret, C.J. ; Dept. of Electr. & Comput. Eng., Minnesota Univ., Minneapolis, MN, USA ; Giannakis, G.B.

Impulse radio (IR) is an ultra-wideband system with attractive features for baseband asynchronous multiple access (MA), multimedia services, and tactical wireless communications. Implemented with analog components, the continuous-time IRMA model utilizes pulse-position modulation (PPM) and random time-hopping codes to alleviate multipath effects and suppress multiuser interference (MUI). We introduce a novel continuous-time PPM-IRMA model, deduce a low-complexity approximate one, and derive its discrete-time equivalent model. Relying on a time-division-duplex access protocol and orthogonal user codes, we design composite linear/non-linear receivers for the downlink. The linear step eliminates MUI deterministically and accounts for frequency-selective multipath while a maximum likelihood (ML) receiver achieves symbol detection

Published in:

Sensor Array and Multichannel Signal Processing Workshop. 2000. Proceedings of the 2000 IEEE

Date of Conference:

2000