Tighter low bound of achievable rate in downlink multiuser MIMO with imperfect CSIT | Zendy

Li Shichao | Zendy; Qiu Ling | Zendy

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Tighter low bound of achievable rate in downlink multiuser MIMO with imperfect CSIT

Author(s) -

Li Shichao,

Qiu Ling

Publication year - 2013

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

eISSN - 1350-911X

pISSN - 0013-5194

DOI - 10.1049/el.2013.0966

Subject(s) - telecommunications link , imperfect , mimo , computer science , control theory (sociology) , mathematics , electronic engineering , telecommunications , engineering , beamforming , philosophy , linguistics , control (management) , artificial intelligence

One of the challenges to implementing downlink multiuser multiple‐input multiple‐output in practical systems is to overcome the detrimental impact of the imperfect channel state information at transmitter (CSIT). Researchers have derived a low bound to describe the imperfect CSIT's impact on the achievable rate. However, this low bound is not tight, especially when the quality of CSIT is poor. A tighter low bound using the exponential integral is proposed. A strict proof is given and the simulation results verify the tightness.

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