Patent ID: 7394754
Filing Date: 2008-07-01
Classification: H04L

Abstract:
1. A wireless communication device in an orthogonal frequency-division multiplexing system employing multiple-branch transmitter diversity, the transmitter comprising: a serial-to-parallel converter converting a serial digital input into a frequency-domain parallel data block; an inverse Fourier transform circuit performing an inverse Fourier transform on the frequency-domain parallel data block to produce a time-domain parallel data block; a parallel-to-serial converter converting the time-domain parallel data block into a serial time-domain signal; a space-time block-code encoder having a first output port and a second output port, the space-time block-code encoder converting the serial time domain signal to pairs of signals for transmission such that the signals are: a first cyclic prefix adder adding a cyclic prefix to the signal at the first output port to produce a first prefixed signal; a second cyclic prefix adder adding a cyclic prefix to the signal at the second output port to produce a second prefixed signal; a first digital-to-analog converter converting the first prefixed signal to a first analog signal; a second digital-to-analog converter converting the second prefixed signal to a second analog signal; a first transmitter transmitting the first analog signal; and a second transmitter transmitting the second analog signal at substantially the same time as the transmission of the first analog signal.