Patent ID: 7298722
Filing Date: 2007-11-20
Classification: H04B,H04J,H04L

Abstract:
1. A radio transmitting apparatus comprising: a plurality of spreading sections that spread a plurality of transmit signals using spreading codes different from each other; an orthogonal frequency division multiplexing section that performs orthogonal frequency division multiplexing on spread signals obtained by the spreading sections; and a spread signal assigning section that selects between assigning the spread signals only in a frequency axis direction and assigning the spread signals in both the frequency axis direction and time axis direction, on a per subcarrier group basis, based on channel quality of each subcarrier or an error rate required for the transmit signals, wherein: the spread signal assigning section assigns the spread signals so that a subcarrier group in which the spread signals are assigned only in the frequency axis direction and a subcarrier group in which the spread signals are assigned in both the frequency axis direction and the time axis direction are present in a same time.