Combined frequency-time domain power adaptation for CDMA communication systems
    52.
    发明申请
    Combined frequency-time domain power adaptation for CDMA communication systems 有权
    用于CDMA通信系统的组合频域功率适配

    公开(公告)号:US20050213552A1

    公开(公告)日:2005-09-29

    申请号:US11077435

    申请日:2005-03-10

    IPC分类号: H04B7/005 H04B7/216 H04L27/26

    CPC分类号: H04W52/42 H04L27/2608

    摘要: Practical transmission power adaptation in multicarrier code division multiple access (MC-CDMA) communications is using either a frequency domain technique or a time domain technique or a combined frequency and time domain technique in response to channel variations. With frequency domain power adaptation, the transmission power is allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers, where the strongest subcarriers are understood to exhibit the highest channel gains. A substantially optimal N′ can be chosen so that the average bit error rate (BER) is minimized. In the time domain power adaptation technique, transmission power is adapted so that the desired signal strength at the receiver output is maintained at a fixed level. In the combined time and frequency domain adaptation technique, the transmission power is first allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers and then it is adapted so that the desired signal strength at the receiver output is maintained at a fixed level.

    摘要翻译: 多载波码分多址(MC-CDMA)通信中的实际发射功率适配采用频域技术或时域技术,或者采用组合频域和时域技术来响应信道变化。 通过频域功率自适应,发射功率分配在N'(1 <= N'<= N)个最强子载波上,而不是在所有可能的N个子载波上分配,其中最强子载波被理解为呈现最高信道增益。 可以选择基本上最佳的N',使得平均误码率(BER)被最小化。 在时域功率自适应技术中,发射功率被适配成使得接收机输出端的期望信号强度保持在固定的水平。 在组合的时域和频域适应技术中,首先在N'(1 <= N'<= N)个最强子载波上分配发射功率,而不是在所有可能的N个子载波上分配发射功率,然后适配使得所需的信号强度 在接收机输出端保持固定的电平。