Matrix processing engine for multi-tone MIMO systems

摘要

A wireless transceiver apparatus including: a channel estimator, a discrete matrix transform module, a tone set controller, and a shared matrix transform module. The channel estimator determines a channel matrix for each tone on each communication link. The discrete matrix transform module derives a transform matrix for the communication link(s) on a selected base tone from the associated channel matrix determined by the channel estimator. The tone set controller initializes an estimation of the transform matrix, on a neighboring tone, with the transform matrix derived for the base tone. The shared matrix transform module iteratively estimates the transform matrix on a neighboring tone, from successive perturbations of the initial transform matrix derived for the base tone and the associated channel matrix for the neighboring tone; thereby reducing a number of iterations required to estimate the transform matrix on the neighboring tone.

主权项

1. A wireless access point (WAP) supporting wireless communications with associated stations on a selected communication channel of a wireless local area network (WLAN); and the WAP comprising:
a plurality of antennas; a plurality of components coupled to one another to form a plurality of the transmit and receive paths each coupled to a corresponding one of the plurality of antennas for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexed (OFDM) communications on the selected communication channel; a channel estimator coupled to the plurality of components and configured to explicitly sound each of at least two of the associated stations targeted for a multi-user (MU)-MIMO communication link and to determine from feedback received therefrom a channel matrix “H” to each of the targeted stations for corresponding ones of the OFDM tones; a tone set controller coupled to the channel estimator and configured to identify sets of the selected communication channel's OFDM tones and within each set a base and at least one neighboring tone proximate in frequency with the base tone; a discrete at transform module configured to derive as precode matrix for each base tone from the corresponding channel matrices for each base tone as determined by the channel estimator, for spatially mapping MU-MIMO transmissions to the at least two stations; a shared matrix transform module coupled to the discrete matrix transform module and configured to estimate a precode matrix for the at least one a neighboring tone, from the corresponding channel matrices for the at least one neighboring tone and the precede matrix for the base tone of the corresponding set of tones; thereby reducing an amount of time required for the estimation of each neighboring tone's precode matrix by the shared matrix transform module, relative to the amount of time required for the determination of the base tone's precode matrix by the discrete matrix transform module; and a spatial mapper component of the plurality of components for spatially mapping the MU-MIMO OFDM wireless transmissions utilizing the corresponding base tone precode matrix for the base tone in each set and the corresponding neighboring tone precode matrix for the at least one neighbor tone in each set.