Sökning: "Qingbi Liao"

Hittade 2 uppsatser innehållade orden Qingbi Liao.

1. 1. Ray-tracing based analysis of channel characteristics and capacity improvement capabilities of spatial multiplexing and beamforming at 15 and 28 GHz

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Qingbi Liao; [2016]
   Nyckelord :5G; 15 GHz; 28 GHz; beamforming; capacity; channel multiplexing richness; hybrid beamforming; MIMO; mm-Wave; ray-tracing; spatial multiplexing; Technology and Engineering;

   Sammanfattning : In the previous decades, mm-Wave frequency bands have largely been ignored for cellular communication because of the high free space attenuation as well as the cost and complexity of mm-Wave RF circuits. However, with the improvement of RF and antenna technologies over the last decade, it has become feasible to con- sider mm-Wave bands for cellular communications. LÄS MER

3. 2. Performance evaluation of interleaving techniques for IEEE 802.15.4 transmissions

   Kandidat-uppsats, Mittuniversitetet/Avdelningen för informations- och kommunikationssystem

   Författare :Jiahuan Lei; Qingbi Liao; [2014]
   Nyckelord :interleaving; Matlab; Reed-Solomon; TinyOS; WSN; FEC; MicaZ;

   Sammanfattning : In the wireless sensor network, the WLAN interference, multi-path fading andattenuation are the main reason for packets’ corruption. Forward errorcorrection is one of the methods for error mitigation. Many coding methods aredesigned to improve the reliability of wireless channel. LÄS MER