Impulse radio (IR) ultrawide band systems have well documented advantages for low-power peer-to-peer and multiple access communications. Space-time (ST) coding on the other hand, has gained popularity as an effective means of boosting rates and performance. Existing IR transmitters rely on a single antenna, while ST coders have so far focused on digital linearly modulated transmissions. In this paper, we develop an orthogonal ST coding scheme for the analog nonlinearly (pulse-position) modulated multi-antenna IR system. We show that the resulting analog noncoherent detector is equivalent to an existing digital ST decoder possessing maximum likelihood optimality. Simulations testing peer-to-peer and multi-access IR scenarios confirm considerable increase in both bit-error-rate performance and number of users that can be accommodated, when wedding ST coding with IR.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Jan 1 2002|
|Event||2002 IEEE Conference on Ultra Wideband Systems and Technologies, UWBST 2002 - Baltimore, MD, United States|
Duration: May 21 2002 → May 23 2002
|Other||2002 IEEE Conference on Ultra Wideband Systems and Technologies, UWBST 2002|
|Period||5/21/02 → 5/23/02|