| 摘要 |
A device includes a signaling interface to receive OFDM signaling for an OFDM channel from a plurality of transmit nodes and an OFDM receiver process the OFDM signaling. The device further includes a channel allocation module to determine, for each transmit node, a corresponding SNR for each of a plurality of subchannels of the channel and to allocate, to each transmit node of the plurality of transmit nodes, a corresponding subset of subchannels of the plurality of subchannels. The channel allocation module further is to select, for each subset of subchannels, one or more subchannels for use as pilots by the corresponding transmit node based on the SNRs of the subchannels in the subset. The device further includes an OFDM transmitter to transmit configuration information to the plurality of transmit nodes, the configuration information representing the allocation of the subchannels and the selection of subchannels for use as pilots. |
| 主权项 |
1. In an orthogonal frequency division multiplexing (OFDM) transceiver device, a method comprising:
determining, for each of a plurality of transmit nodes, a corresponding signal-to-noise ratio (SNR) for each of a plurality of subchannels of an OFDM channel; allocating, to each transmit node of the plurality of transmit nodes, a corresponding subset of subchannels of the plurality of subchannels; selecting, for each subset of subchannels, one or more subchannels for use as pilots by the corresponding transmit node based on the SNRs of the subchannels in the subset, wherein selecting one or more subchannels for use as pilots comprises:
determining a maximum number of pilots per transmit node; andfor each subject of subchannels, selecting a number of subchannels having the highest SNRs of the subset for use as pilots, the selected number of subchannels less than or equal to the maximum number of pilots; and wherein allocating the corresponding subset of subchannels comprises:
assigning to each transmit node a corresponding subset of buckets of a plurality of buckets, the number of buckets in the subset based on a data rate requirement of the transmit node;distributing the plurality of subchannels among the plurality of buckets based on the SNRs of the plurality of subchannels,for each bucket, determining a total bit loading of the bucket based on the SNRs of the subchannels distributed to the bucket;determining a lowest total bit loading of the plurality of buckets; andequalizing the total bit loading of the plurality of buckets to the lowest total bit loading by reducing the bit loading of each of one or more subchannels distributed to those buckets having a total bit loading greater than the lowest total bit loading, wherein reducing the bit loading of each of the one or more subchannels for equalizing the total bit loading of the plurality of buckets reduces the SNRs of the one or more subchannels. |
