| 摘要 |
Modulation codes, such as scrambling codes used in a code division multiple access (CDMA) wireless communications system, are assigned to terminals based on power characteristics of the terminals. The terminals may then transmit using the assigned codes, for example, on uplink channels to base stations of the system. A code may be assigned to a terminal to control power dissipation in the terminal, more specifically, to optimize peak to average ratio (PAR) in a signal input to the terminal's transmit power amplifier, thus optimizing power dissipation in the amplifier. Priority among a set of scrambling codes may be determined based on numbers of occurrences of chip strips that produce peaks in signals modulated by the scrambling codes. The scrambling codes of the set of scrambling codes may be assigned to terminals based on the determined priority of the set of scrambling codes. In addition, complex scrambling codes may be optimized by optimizing the coincidence of chip strips in the complex scrambling code's I and Q components that produce peaks in signals modulated by these components. According to another aspect, modified codes that have undesirable chip strips replaced with more benign chip strips may be assigned to power-constrained terminals.
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