Modified givens rotations for inverse updating in qr decomposition

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The results of the QR decomposition may include a number of angles encoding a Q matrix and an inverse of an R matrix.

The receiver may use the inverse of the R matrix to calculate a signal-to-noise ratio (SNR) of the received signals.

A training sequence may include one or more pilot symbols, i.e., OFDM symbols including only pilot information (which is known a priori at the receiver) on the tones.

The pilot symbol(s) are inserted in front of each transmitted frame.

The receiver receives multiple copies of the coded signal and processes the copies to obtain an estimate of the received data.

A receiver in a MIMO-OFDM system may estimate the transmitted signal by performing a QR decomposition on the channel response matrix.

The receiver may utilize Givens rotations to perform the decomposition, which may be performed using coordinate rotation digital computer (CORDIC) modules.

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