CN2731876Y - 为二元判定提供偏置准则的基站 - Google Patents
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- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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Abstract
一种在无线通信***中用于将要求一不平衡防护的二元判定准则进行偏置的基站(BS),所述无线通信***具有用以在一个给定的信道从一发送者接收一个通信并产生所述信道的信道估算的信道估算装置、用以接收所述信道估算并产生所述通信信道的信号干扰比(SIR)的信号干扰比导出装置、用以接收具有信号幅度延续给定范围的多个测试信号,噪声和信号干扰比的比较器,以确定每个复合信号的正确性以及在每个信号幅度的正确信号及不正确信号的实例,并选择一个大于单独采用的噪声的阈值,以提供一个虚报ACK条件可接受的数量,所述比较器通过将所述信号干扰比与一给定阈值进行比较而产生一输出,选择所述给定阈值以将准则偏置为负确认(NACK)的传送条件用以指示应该重发所接收的通信、用以接收所述比较器的一输出以发送NACK条件的NACK发射器、以及ACK发射器,用于接收所述比较器的一输出以发送所述ACK条件,当该SIR大于该阈值的时候,确认收到一个无错误通信。此外,一周期性阈值确定装置周期性地产生所述给定阈值。
Description
技术领域
本实用新型涉及无线通信。尤其是,本实用新型涉及对于高速下行链路数据分组(HSDP)提供偏置二元判定的基站。
背景技术
在HSDP HSDPA以及许多的其他的通信***中,存在需要二元判定的应用,但是其中作为在该二个判定之间错误的恶化是不平衡的。
例如,HSDPA使用一个ACK/NACK信号,这里该用户设备(UE)表示是否一个发送的数据块已经成功地被解码。已经认识到,与对于一个被不正确地解码为NACK的ACK消息相比较,对于一个被不正确地解释为ACK的NACK消息对于***性能是更加有害的。在后者的情况下,该错误将导致传送块被不必要地重发,其相当于仅很小的效率损失。在前一种情况下,对于预先发送的字块该发送方将假定成功,并且不会重新发送它。这是一个严重故障,导致严重的***中断。
已经认可若干显而易见的方法去偏置该答案便于以该NACK识别该条件。例如,在标准二进制移相键控(BPSK)相干解调中,该输出信号经常被标准化,例如,一个理想的代表1的信号是+1.0,同时一个理想的代表0的信号是1.0,并且在一个典型的信道中,其具有减损,干扰和噪声,该标称输出可以采取在其间的任意值。
在一个未加偏置的判定中,如果一个输出z>0,那么该过程表示1,并且,如果该输出z<0,那么该过程表示该输出=0。在一个偏置的判定中,如果该输出z>X,那么表示1,否则表示0。X被标识为该阈值,并且基于该分析被选择。如果是希望有利于输出1,那么X将是负值,例如,一个很小的负数,例如负的0,1等等。
利用上述过程,标准化该输出并且可以准确和综合实施地推导出该最佳门限,以及由于在实施中的容限常遭受降低。
实用新型内容
本实用新型的目的是提供一种在无线通信***中对于要求不平衡防护的二元判定提供偏置准则的基站(BS)。
根据本实用新型的一种在无线通信***中对于要求不平衡防护的二元判定提供偏置准则的基站(BS),包括一信道估算装置,配置为在一个给定的信道上从发送者接收一个通信并产生所述信道的信道估算;一信号干扰比(SIR)导出装置,配置为接收所述信道估算并产生该通信信道的信号干扰比(SIR);一比较装置,配置为接收具有信号幅度延续给定范围的多个测试信号、噪声和所述信号干扰比(SIR),所述比较装置确定每个复合信号的正确性,确定在每个信号幅度正确的信号和不正确的信号的实例,并选择一个阈值,它最好是大于单独采用的噪声,并且它提供一个虚报(false declarations)ACK条件可接受的数量,所述比较装置通过将所述信号干扰比(SIR)与一给定阈值相比较而产生一输出,所述给定阈值被选择去偏置该准则朝着一个(NACK)传送条件表示接收的通信应该被重发的方向;一用于发送该NACK条件的装置,配置为接收所述比较装置的一输出以发送该NACK条件;以及一ACK发送装置,配置为接收所述比较器的一输出以发送所述ACK条件,当该SIR大于该阈值的时候,确认收到一个无错误通信。
按照本实用新型一个准则被使用,在应用中其使决定更加简单和更加可靠,与简单的X阈值相比较该准则显著地是更可靠的。
按照这个准则,对于时分双工(TDD),该准则是基于该测量的信号干扰比(SIR),其是由信道估计过程获得的。当该SIR值是低的时候,可以表明实际上所有的错误情况存在。
无线电调制(SM)解码器的二次故障之间相关性或者靠近故障,在传送其他的位中矢量是高,因此,本实用新型的准则是非常可靠的并且可以容易实现。该阈值被设置在足够低的电平和足够高电平,使得对于高于该阈值的SIR出现一个可接受的低频率的错误,以及对于低于该阈值的SIR防止一个无法接受的高数量错误。
附图说明
图1是一个用于实践本实用新型新颖的方法装置的示意图。
具体实施方式
图1提供一个用于实践本实用新型方法的程序。在该示出的例子中,其是一个下行链路例子,在步骤S1提供的一个设备诸如基站(BS10),基于来自UE12的一个通信,在步骤S2利用这个通信去获得信道估计。
在步骤S3,该BS10使用公知的方法从该信道估计导出一个信号干扰比(SIR)。在步骤S4,BS10与一个给定的阈值比较该在步骤S3获得的SIR。
该阈值可以通过利用许多不同的方法的任何一个确定。可以使用一种以试验装备通过模拟和实物试验辅助的综合分析的方法去确定。测试信号加上噪声被输入给该试验装备,并且输出信号被查验。该输出信号被测量,并且正确的二元判定也被确定。通过一个有用信号的整个范围,包括非常低的信号,这个测试被重复。对于每个幅度电平,正确判别和不正确判定的数目情况被存储。通常,强信号是与正确判别的很高频率有关,并且弱信号是与不正确的判定的高的情况有关。该阈值最好是大于单独采用的噪声电平。
由于目标是避免一个特定的错误类型,例如表示一个ACK的可能性,给定一个NACK被发送,被选择的该阈值被偏置,使得,当信号大于该阈值的时候,存在一个可以接受的低频率的错误,并且当信号低于这个阈值的时候,存在一个无法接受的错误出现频率。由于目标是避免虚报ACK,发生在信号低于阈值的任何判定被表示为NACK。一般地说,当信号低于该阈值的时候,从而选择的该二元判定被偏置,即使错了其导致最小的不幸的结果。如步骤S11所示,这个方法可以或者脱机或者周期性地由该BS10(或者UE12)执行。此外,如果拒绝,可以使用其他的方法去获得阈值。
如果该SIR小于该阈值,在步骤S5,BS10发送一个NACK信号给UE12。在步骤S6,UE12接收和检测该NACK信号,并且在步骤S7重发由BS10在步骤S8接收的该临时存储的通信。
返回步骤S4,假定SIR大于该阈值,该程序分支转移到步骤S9去发送一个ACK信号。在步骤S10该UE12接收该ACK信号,并且清除在步骤S1临时存储的该通信。
应该明白,在图1中示出的程序同样适用于上行链路,其中由该BS10和UE12执行的功能被反转,并且在步骤S1是该BS10发送和临时存储一个通信。该UE12在步骤S2获得信道估计,在步骤S3导出该SIR,在步骤S4以一个给定的阈值比较该导出的SIR,并且在步骤S6发送NACK给该BS。BS10分别在步骤S6和S7接收该NACK和重发该临时存储的通信,该重发的通信由该UE12在步骤S8接收。如果该SIR大于该阈值设置,该UE在S8发送一个ACK条件,该ACK条件是由该BS10在步骤S10接收的,借此该ACK信号使该BS10清除临时存储的通信。
应该明白,本实用新型的方法还可以同时在UE和BS之间通信的上行链路和下行链路两者中使用。
Claims (2)
1.一种在无线通信***中对于要求不平衡防护的二元判定提供偏置准则的基站(BS),其特征在于所述基站,
具有一信道估算装置,配置为在一个给定的信道上从发送者接收一个通信并产生所述信道的信道估算,
一信号干扰比(SIR)导出装置,配置为接收所述信道估算并产生该通信信道的信号干扰比(SIR),
一比较装置,配置为接收具有信号幅度延续给定范围的多个测试信号、噪声和所述信号干扰比(SIR),所述比较装置确定每个复合信号的正确性,确定在每个信号幅度正确的信号和不正确的信号的实例,并选择一个阈值,它最好是大于单独采用的噪声,并且它提供一个虚报(falsedeclarations)ACK条件可接受的数量,所述比较装置通过将所述信号干扰比(SIR)与一给定阈值相比较而产生一输出,所述给定阈值被选择去偏置该准则朝着一个(NACK)传送条件表示接收的通信应该被重发的方向,一用于发送该NACK条件的装置,配置为接收所述比较装置的一输出以发送该NACK条件,以及一ACK发送装置,配置为接收所述比较器的一输出以发送所述ACK条件,当该SIR大于该阈值的时候,确认收到一个无错误通信。
2.根据权利要求1所述的基站,其特征在于所述基站进一步包括一周期性阈值确定装置,其周期性地产生所述给定阈值。
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