Patent ID: 8885455

Claim:
A method for sending data, the method comprising: obtaining data packets at a first transmit diversity branch and at a second transmit diversity branch; modulating the data packets at the first transmit diversity branch using a first modulation mode; sending the modulated data packets from the first transmit diversity branch; modulating the data packets at the second transmit diversity branch using a second modulation mode; and sending the modulated data packets from the second transmit diversity branch; wherein the first modulation mode and the second modulation mode form a preset optimized combination, wherein a first group of modulation factors for modulating the data packets by using the first modulation mode is different from a second group of modulation factors for modulating the data packets by using the second modulation mode, wherein the first group of modulation factors and the second group of modulation factors comply with a preset modulation factor mapping relationship and wherein each modulation factor in the first group of modulation factors is mapped to a corresponding modulation factor in the second group of modulation factors, wherein the preset modulation factor mapping relationship requires that mapped modulation factors have an identical absolute value, are conjugates of one another, or have an identical modulus; wherein a first group of constellation points modulation symbols of the first modulation mode is different from a second group of constellation points modulation symbols of the second modulation mode, and wherein the first group of constellation points modulation symbols and the second group of constellation points modulation symbols comply with a preset constellation points modulation symbol mapping relationship; and wherein the preset constellation points modulation symbol mapping relationship requires the first group of constellation points modulation symbols and the second group of constellation points modulation symbols have at least one different constellation points modulation symbols, wherein the different constellation points modulation symbols meet one of the following conditions: identical absolute value, mutual conjugation, or identical modulus.