Methods and systems for OFDM using code division multiplexing

摘要

In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

主权项

1. An Orthogonal Frequency Division Multiplexing (OFDM) receiver, comprising:
a first antenna; at least one additional antenna; and receive logic adapted to receive a signal, wherein the signal includes:
for reception by the first antenna, a first plurality of OFDM symbols containing a plurality of clusters, each cluster including a plurality of sub-carriers over a plurality of OFDM symbol durations and each cluster having spread within it using code division multiplexing (CDM) at least one of data and pilots, andfor reception by the at least one additional antenna, an additional plurality of OFDM symbols containing an additional plurality of clusters, each additional cluster comprising an additional plurality of sub-carriers over an additional plurality of OFDM symbol durations and each additional cluster having spread within it using an additional CDM code at least one of data and pilots.