This paper deals with the design and performance analysis of the transmission precoder optimization for multiple-input multiple-output (MIMO) systems with limited feedback of channel state information (CSI). We assume...This paper deals with the design and performance analysis of the transmission precoder optimization for multiple-input multiple-output (MIMO) systems with limited feedback of channel state information (CSI). We assume that the receiver can get perfect channel knowledge by channel estimation while the transmitter only has partial channel knowledge from limited feedback. We present a minimum mean square error (MMSE) criterion based codebook construction algorithm for MIMO pre- coded spatial multiplexing systems under a specific average power constraint. The optimal transmitter structure is employed in this paper. Simulation results show that the MMSE criteria based codebook construction algorithm with hybrid design of power allocation and precoding can achieve better performance than that of equal power allocation based codebook of previous research.展开更多
Terms of intelligence in 20th and 21th century mean the methods of automatic extraction, analysis, interpretation and use of information. Thus, the intelligence services in the future created an electronic database in...Terms of intelligence in 20th and 21th century mean the methods of automatic extraction, analysis, interpretation and use of information. Thus, the intelligence services in the future created an electronic database in which to their being classified intelligence products, users could choose between the latter themselves relevant information. The EU （European Union） that activities are carried out from at least in year 1996, terrorist attacks in year 200l is only accelerating. Proposals to increase surveillance and international cooperation in this field have been drawn up before September 11 2011. On the Web you can fmd a list of networks （Cryptome, 2011）, which could be connected, or are under the control of the security service--NSA （National Security Agency）. United States of America in year 1994 enacted a law for telephone communication--Digital Telephony Act, which would require manufacturers of telecommunications equipment, leaving some security holes for control. In addition, we monitor the Internet and large corporations. The example of the United States of America in this action reveals the organization for electronic freedoms against a telecom company that the NSA illegally gains access to data on information technology users and Internet telephony.展开更多
SNUC （undifferentiated sinonasal carcinoma） is a rare tumor. The exact cause of this cancer is not known. Patients usually have signs and symptoms of bleeding from the nose, runny nose, duplicate photos, symptoms of...SNUC （undifferentiated sinonasal carcinoma） is a rare tumor. The exact cause of this cancer is not known. Patients usually have signs and symptoms of bleeding from the nose, runny nose, duplicate photos, symptoms of chronic sinus infections and nose, nasal obstruction, or facial pain. We reported a case of seventy year old patient with sinonasal undifferentiated carcinoma in the right maxillary sinus. Six months ago, the patient was conducted operations polyp in the right nasal hall. He had pain in the right side of his face and swelling in the mouth in the area of the upper jaw on the right side. The patient was operated tumor of the right maxillary sinus, with expansion in the ethmoid sinus, nasal cavity and infratemporal space. The neck dissection was done on the same side. Postoperatively, he received radiation therapy and chemotherapy. SNUC is very rare aggressive cancer that requires aggressive therapy. This cancer is considered in need of modified maxillary sinuses, as well as for modified sinus in polyps or after the operation of the same. Despite extensive surgery, radio therapy and implemented chemotherapy, the prognosis of these tumors is very poor展开更多
基金Preject (No.60572157) the National Natural Science Foundation of China
文摘This paper deals with the design and performance analysis of the transmission precoder optimization for multiple-input multiple-output (MIMO) systems with limited feedback of channel state information (CSI). We assume that the receiver can get perfect channel knowledge by channel estimation while the transmitter only has partial channel knowledge from limited feedback. We present a minimum mean square error (MMSE) criterion based codebook construction algorithm for MIMO pre- coded spatial multiplexing systems under a specific average power constraint. The optimal transmitter structure is employed in this paper. Simulation results show that the MMSE criteria based codebook construction algorithm with hybrid design of power allocation and precoding can achieve better performance than that of equal power allocation based codebook of previous research.
文摘Terms of intelligence in 20th and 21th century mean the methods of automatic extraction, analysis, interpretation and use of information. Thus, the intelligence services in the future created an electronic database in which to their being classified intelligence products, users could choose between the latter themselves relevant information. The EU （European Union） that activities are carried out from at least in year 1996, terrorist attacks in year 200l is only accelerating. Proposals to increase surveillance and international cooperation in this field have been drawn up before September 11 2011. On the Web you can fmd a list of networks （Cryptome, 2011）, which could be connected, or are under the control of the security service--NSA （National Security Agency）. United States of America in year 1994 enacted a law for telephone communication--Digital Telephony Act, which would require manufacturers of telecommunications equipment, leaving some security holes for control. In addition, we monitor the Internet and large corporations. The example of the United States of America in this action reveals the organization for electronic freedoms against a telecom company that the NSA illegally gains access to data on information technology users and Internet telephony.
文摘SNUC （undifferentiated sinonasal carcinoma） is a rare tumor. The exact cause of this cancer is not known. Patients usually have signs and symptoms of bleeding from the nose, runny nose, duplicate photos, symptoms of chronic sinus infections and nose, nasal obstruction, or facial pain. We reported a case of seventy year old patient with sinonasal undifferentiated carcinoma in the right maxillary sinus. Six months ago, the patient was conducted operations polyp in the right nasal hall. He had pain in the right side of his face and swelling in the mouth in the area of the upper jaw on the right side. The patient was operated tumor of the right maxillary sinus, with expansion in the ethmoid sinus, nasal cavity and infratemporal space. The neck dissection was done on the same side. Postoperatively, he received radiation therapy and chemotherapy. SNUC is very rare aggressive cancer that requires aggressive therapy. This cancer is considered in need of modified maxillary sinuses, as well as for modified sinus in polyps or after the operation of the same. Despite extensive surgery, radio therapy and implemented chemotherapy, the prognosis of these tumors is very poor
