摘要:
In a communication method for transmitting a multipath characteristic measurement signal and a plurality of data transmission signals, the multipath characteristic measurement signal and data transmission signals are a signal array formed by a plurality of coefficient matrices that are orthogonal to one another within the matrices and which comprise at least one coefficient array that is common in the column direction or row direction. The multipath characteristic measurement signal formed by the coefficient matrices is the same signal array formed by the one common coefficient array. As a result, the transmission wait time and the signal reception time required for transmission of a multiplicity of data transmission signals are shortened in the simultaneous transmission of the multipath characteristic measurement signal and the plurality of data transmission signals by the spread modulation of transmission data by means of a spread spectrum, whereby the scale of the reception processing device is miniaturized.
摘要:
In a communication method for transmitting a multipath characteristic measurement signal and a plurality of data transmission signals, the multipath characteristic measurement signal and data transmission signals are a signal array formed by a plurality of coefficient matrices that are orthogonal to one another within the matrices and which comprise at least one coefficient array that is common in the column direction or row direction. The multipath characteristic measurement signal formed by the coefficient matrices is the same signal array formed by the one common coefficient array. As a result, the transmission wait time and the signal reception time required for transmission of a multiplicity of data transmission signals are shortened in the simultaneous transmission of the multipath characteristic measurement signal and the plurality of data transmission signals by the spread modulation of transmission data by means of a spread spectrum, whereby the scale of the reception processing device is miniaturized.
摘要:
A coefficient sequence of a spreading sequence is sequentially shifted one pitch at a time, transmission data is multiplied by a plurality of coefficient sequences to produce a plurality of transmission data, and the plurality of produced transmission data are added up to produce a transmission data sequence. Alternatively, the coefficient sequence of the spreading sequence is multiplied by the transmission data, the result is sequentially shifted one pitch at a time, and a plurality of transmission data are added up to produce a transmission data sequence. Transmission data is multiplied by the coefficient sequence of a spreading sequence to produce a finite-length signal and this finite-length signal is repeated an infinite number of times to produce an infinite-length signal. Transmission data, which is longer than the coefficient sequence, is cut out from this infinite-length signal to produce a transmission data sequence. This makes it possible to include transmission data into a spreading sequence and, therefore, when the transmission data is modulated through spread spectrum, an increase in the amplitude of a signal is reduced and the dynamic range of an amplifier on the receiving side is reduced.