Patent ID: 9130696
Filing Date: 2015-09-08
Classification: H04B,H04L

Abstract:
1. In a multi-antenna transmitter disposed to transmit an input signal as a plurality of radio frequency (RF) output signals via a corresponding plurality of transmit antennas, said input signal having a plurality of subcarrier signals, an RF signal processing method comprising: performing a joint calculation to determine both a plurality of transmit RF weighting values based on a plurality of bit loading values, and the plurality of bit loading values based on the plurality of transmit RF weighting values; adaptively bit loading said plurality of subcarrier signals in accordance with corresponding ones of the plurality of bit loading values in order to form a corresponding plurality of bit-loaded subcarrier signals; upconverting said plurality of bit-loaded subcarrier signals to create an RF input signal; dividing said RF input signal in order to form a plurality of divided RF signals; and weighting said plurality of divided RF signals in accordance with corresponding ones of the plurality of transmit RF weighting values in order to form said plurality of RF output signals, wherein selection of said plurality of transmit RF weighting values and of said plurality of bit loading values are performed so as to provide a desired data rate of said transmitter.