Research Of Partial Window Multiple Rejects ARQ Applied In UWB System

Different from the traditional technology which use of the carrier,Ultra-wideband wireless technology uses nanosecond pulses to transmit information. UWB required bandwidth up to several GHz, and can share frequency bands with other wireless communication technology. Because of these characteristics, ultra-wideband wireless technology has very broad application prospects. UWB wireless technology's major scenarios is indoor. Since the indoor channel conditions are complex, ultra-wideband wireless systems are likely to face a very high frame loss rate. Therefore, UWB wireless systems require a very efficient ARQ mechanism to ensure the quality of the channel when the transmission quality is poor. Multiple Rejects ARQ mechanism part of the window is such a mechanism.This paper has following improvements:Different to the previous use of offset, this paper uses offset segment and offset both, and make analysis of the relationship and difference between them. In the confirmation message format design, this paper first proposed a "confirmation ratio "concept, to represent the efficiency of the confirmation, and make a confirmation that the design format of the confirm information is to improve the confirmation ratio.There are six traditional offset Types: cumulative confirmed negative offset, non-cumulative confirmed negative offset, non-cumulative confirmed negative offset 2, cumulative confirmed positive offset, non-cumulative confirmed positive offset, non-cumulative confirmed positive offset 2. Based on these six types, this paper proposed four new types, they are cumulative confirmed positive first, non-cumulative confirmed positive first, confirmed negative first, non-cumulative confirmed negative first. In addition, the paper analysis the differences and similarities of various types, the six traditional types are referred to as "the same offset type " ,the four new types are called "staggered offset type. "...