Precoder for spatial multiplexing, multiple antenna transmitter
OwnerGeorge Jöngreninventor
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Abstract
A method of spatially precoding data includes determining a transmission rank of a communication channel and selecting a set of one or more precoding filters derived from a single generator matrix based on said transmission rank. The method also includes precoding data for transmission to a remote device using said precoding filters in a predetermined order according to a predetermined precoding sequence. The precoding may include using different ones of said precoding filters during different precoding intervals in a predetermined precoding period of the predetermined precoding sequence. Additionally, precoding data for transmission may involve traversing an Orthogonal Frequency Division Multiplexing (OFDM) resource block in an alternating pattern during said predetermined precoding period.
Claims30
A method of spatially precoding data in a channel independent way, said method comprising:
- selecting a transmission rank based on a transmission rank of a communication channel;
- selecting a set of one or more precoding filters equivalent to column subsets of a single generator matrix based on said selected transmission rank;
- and
- precoding data for transmission to a remote device using different ones of said precoding filters during different precoding intervals in a precoding period of a predetermined precoding sequence;
- wherein selecting a set of one or more precoding filters comprises selecting one or more columns of the generator matrix for each precoding filter, and wherein the number of columns selected for each precoding filter equals the transmission rank;
- and
- wherein the ordering of said precoding filters in said predetermined precoding period is such that, for a selected transmission rank, non-overlapping fixed-size groups of consecutively used precoding filters do not have any columns in common.
A transmitter for transmitting spatially precoding data in a channel independent way comprising:
- a transmit controller configured to determine a transmission rank of a communication channel and to select a set of one or more precoding filters equivalent to column subsets of a single generator matrix based on said transmission rank;
- and
- a transmit signal processor including a precoder configured to precode said 30 data for transmission using different ones of said precoding filters during different precoding intervals in a precoding period of a predetermined precoding sequence;
- wherein the transmit signal processor is further configured to select one or more columns of the generator matrix for each precoding filter, and wherein the number of columns in each precoding filter equals the transmission rank;
- and
- wherein the transmit signal processor is further configured to apply the precoding filters in said predetermined precoding period such that, for a selected transmission rank, non-overlapping fixed-size groups of consecutively used precoding filters do not have any columns in common.
A method of receiving spatially precoded data, precoded in a channel independent way, received from a remote device, said method comprising:
- determining a transmission rank applied at a transmitter;
- said method characterized by:
- selecting a set of one or more combining filters based on said transmission rank, wherein said combining filters corresponding to a set of precoding filters are equivalent to column subsets of a single generator matrix;
- and
- combining said spatially precoded data using different ones of said combining filters during different combining intervals in a combining period of a predetermined combining sequence;
- wherein selecting a set of one or more combining filters comprises selecting one or more columns of the generator matrix for each combining filter, and wherein the number of columns selected for each combining filter equals the transmission rank;
- and
- wherein the ordering of said combining filters in said predetermined combining period is such that, for a selected transmission rank, non-overlapping fixed-size groups of consecutively used combining filters do not have any columns in common.
A receiver for receiving spatially precoded data, precoded in a channel independent way, said receiver comprising:
- a receive controller configured to determine a transmission rank applied at a transmitter and to select a set of one or more combining filters wherein said combining filters corresponding to a set of precoding filters are equivalent to column subsets of a single generator matrix based on said transmission rank;
- and
- a receive signal processor including a combiner configured to combine said spatially precoded data using different ones of said combining filters during different combining intervals in a combining period of the predetermined combining sequence;
- wherein said receive signal processor is further configured to select one or more columns of the generator matrix for each combining filter, and wherein the number of columns selected for each combining filter equals the transmission rank;
- and
- wherein the ordering of said combining filters in said predetermined combining period is such that, for a selected transmission rank, non-overlapping fixed-size groups of consecutively used combining filters do not have any columns in common.
Dependencies are inferred from the claim text.