Space-Time Block(STB)code has been an effective transmit diversity technique for combating fading due to its orthogonal design,simple decoding and high diversity gains.In this paper,a unit-rate complex orthogonal STB ...Space-Time Block(STB)code has been an effective transmit diversity technique for combating fading due to its orthogonal design,simple decoding and high diversity gains.In this paper,a unit-rate complex orthogonal STB code for multiple antennas in Time Division Duplex(TDD)mode is proposed.Meanwhile,Turbo Coding(TC)is employed to improve the performance of proposed STB code further by utilizing its good ability to combat the burst error of fading channel.Compared with full-diversity multiple antennas STB codes,the proposed code can implement unit rate and partial diversity;and it has much smaller computational complexity under the same system throughput.Moreover,the application of TC can effectively make up for the performance loss due to partial diversity.Simulation results show that on the condition of same system throughput and concatenation of TC,the proposed code has lower Bit Error Rate(BER)than those full-diversity codes.展开更多
目的比较采用毛囊单位钻取术(follicular unit excision,FUE)喇叭口针和锐针钻取毛囊的临床效果。方法回顾性分析自2024年10月至2025年5月,南方医科大学南方医院进行毛发移植49例患者的临床资料。采用FUE喇叭口针钻取毛囊的患者25例,采...目的比较采用毛囊单位钻取术(follicular unit excision,FUE)喇叭口针和锐针钻取毛囊的临床效果。方法回顾性分析自2024年10月至2025年5月,南方医科大学南方医院进行毛发移植49例患者的临床资料。采用FUE喇叭口针钻取毛囊的患者25例,采用FUE锐针钻取毛囊患者24例。通过查询每例患者供区毛囊钻取情况(包括毛囊钻取时间、毛囊钻取总量及毛囊离断率等)、随访期间供区恢复和并发症情况等,综合分析采用FUE喇叭口针和FUE锐针钻取毛囊的临床效果。结果FUE喇叭口针和FUE锐针组患者中,毛囊的平均钻取总量分别为(5380±237)根毛囊和(5540±204)根毛囊,平均钻取时间分别为(89±23)min和(93±28)min,差异均无统计学意义(P>0.05);平均离断率分别为(4.37±0.31)%和(7.02±0.39)%,差异有统计学意义(P<0.05)。FUE喇叭口针组和FUE锐针组患者供区术后恢复时间均为(3±1)d,并发症发生率差异无统计学意义(P>0.05),术后两组间毛发生长情况无明显差异。结论FUE喇叭口针钻取毛囊具有离断率较低的特点,能够减少毛囊损伤,值得临床推广。展开更多
基金Supported by Chinese 863 project(No.2001 AA 123042).
文摘Space-Time Block(STB)code has been an effective transmit diversity technique for combating fading due to its orthogonal design,simple decoding and high diversity gains.In this paper,a unit-rate complex orthogonal STB code for multiple antennas in Time Division Duplex(TDD)mode is proposed.Meanwhile,Turbo Coding(TC)is employed to improve the performance of proposed STB code further by utilizing its good ability to combat the burst error of fading channel.Compared with full-diversity multiple antennas STB codes,the proposed code can implement unit rate and partial diversity;and it has much smaller computational complexity under the same system throughput.Moreover,the application of TC can effectively make up for the performance loss due to partial diversity.Simulation results show that on the condition of same system throughput and concatenation of TC,the proposed code has lower Bit Error Rate(BER)than those full-diversity codes.
文摘目的比较采用毛囊单位钻取术(follicular unit excision,FUE)喇叭口针和锐针钻取毛囊的临床效果。方法回顾性分析自2024年10月至2025年5月,南方医科大学南方医院进行毛发移植49例患者的临床资料。采用FUE喇叭口针钻取毛囊的患者25例,采用FUE锐针钻取毛囊患者24例。通过查询每例患者供区毛囊钻取情况(包括毛囊钻取时间、毛囊钻取总量及毛囊离断率等)、随访期间供区恢复和并发症情况等,综合分析采用FUE喇叭口针和FUE锐针钻取毛囊的临床效果。结果FUE喇叭口针和FUE锐针组患者中,毛囊的平均钻取总量分别为(5380±237)根毛囊和(5540±204)根毛囊,平均钻取时间分别为(89±23)min和(93±28)min,差异均无统计学意义(P>0.05);平均离断率分别为(4.37±0.31)%和(7.02±0.39)%,差异有统计学意义(P<0.05)。FUE喇叭口针组和FUE锐针组患者供区术后恢复时间均为(3±1)d,并发症发生率差异无统计学意义(P>0.05),术后两组间毛发生长情况无明显差异。结论FUE喇叭口针钻取毛囊具有离断率较低的特点,能够减少毛囊损伤,值得临床推广。
