AAS direct signaling framing methodologies to support high capacity wireless links

摘要

A new frame structure applicable to the IEEE 802.16 OFDMA wireless waveform is described, for the purposes of increasing base station capacity, increasing subscriber link rates and extending base station range. The frame structure provides the necessary constructs so that advance signal processing technologies such as Stacked Carrier Spread Spectrum and adaptive antenna technology may be used in combination with these constructs in order to realize these gains. These concepts are equally applicable in other advanced wireless waveforms based on OFDM or OFDMA such as LTE or UMB.

主权项

1. A method of grouping orthogonal frequency-division multiple access (OFDMA) symbols, and subgroups of OFDMA subcarriers/subchannels therein, to enable stacked carrier spread spectrum (SCSS) and SCSS adaptive array processing, the method being performed in an adaptive antenna system, the method comprising:
constructing one or more subframes, each subframe including:
a plurality of access subchannels, wherein each access subchannel is paired with a non-adjacent access subchannel, and wherein each access subchannel contains at least one data burst region;a predefined number of orthogonal frequency-division multiple access (OFDMA) symbols containing training preambles for an adaptive antenna system (AAS) and distributed across all access subchannels that demarcate a selected AAS zone; anda plurality of payload subchannels, wherein each payload subchannel is paired with a non-adjacent payload subchannel, wherein each payload subchannel contains at least one data burst region, and wherein each payload subchannel comprises one or two AMC bins of OFDM symbols; generating a plurality of spatial planes using a combination of stacked carrier spread spectrum, code nulling, and array processing; and transporting data in the one or more subframes on plurality of spatial planes.