| 摘要 |
By arranging the area covered by a central transmission point into zones and by using different modulation schemes within each zone, increased throughput can be achieved by reducing the interference between communicating devices. The zones typically would be arranged by either distance from the transmission point or by passloss (PL), which is a measure of the signal attenuation of a wireless link. Either the wireless devices can determine the distance between them, or a point external to each device can make or assist with the determination. Multiple methods exist for determination or estimation of PL. In one embodiment, two zones are used with the zone closest to the transmission point, or having a lower PL, being 8 QAM or 16 QAM, while a zone further away, or having a higher PL, would be QPSK. Alternatively, the two zones could be SDMA and non-SDMA, respectively. |
