Patent ID: 7430190

Claim:
A wireless communication system, comprising: a transmit system comprising a first set of two or more antennas, the transmit system being configured to transmit a data signal from each of two or more of the antennas in the first set over a region; and a receive system comprising a second set of two or more antennas each configured to receive the two or more transmitted data signals, wherein the transmit system is configured to adjust a transmission parameter of at least one data signal based on the level of signal fading in the region to maintain a target communication bit rate; wherein the target communication bit rate of is a bit rate for a sustainable bit rate (SBR) conduit; wherein the transmit system is configured to adjust a first transmission parameter and a second transmission parameter, wherein the first transmission parameter is a power at which the data signal is transmitted and the second transmission parameter is a bit rate at which the data signal is transmitted; wherein the transmit system is configured to transmit the data signal in quadrature amplitude modulated (QAM) format and to adjust the second transmission parameter according to: K i =[log 2 (−λ)−log 2 (const· ln 2 ·[C + C] ii −1 )] + wherein Ki is the number of bits represented by a QAM symbol sent from antenna i and is representative of the bit rate at which the data signal is transmitted from antenna i, wherein C is representative of the transfer matrix of the region, const is determined by: const=− ln (5BER target )· N 0 /1.5 wherein BER target is a target bit error rate in the one or more transmitted data signals, N 0 is representative of the noise in the region and λ is determined by: Σ[log 2 (−λ)−log 2 (const· ln 2 ·[C + C] ii −1 )] + =target bit rate× T symbol period wherein T symbol period is the period of a symbol in the respective data signal, and wherein the transmit system is configured to adjust the first transmission parameter according to: Es i = const · ( - λ const · ln ⁢ ⁢ 2 · [ C + ⁢ C ] ii - 1 - 1 ) · [ C + ⁢ C ] ii - 1 = - λ ln ⁢ ⁢ 2 - const · [ C + ⁢ C ] ii - 1 wherein Es i is representative of the power at which the data signal is transmitted from antenna i.