高數據速率無線通信系統中提高誤碼率的混合mimo技術(ijwmt-v4-n4-3).pdf

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I.J. Wireless and Microwave TechnolMO, Spatial Multiplexing, Beamforming, Smart Antenna, BER, Spectral Efficiency.

© 2014 Published by MECS Publisher. Selection and/or peer review under responsibility of the Research
Association of Modern Education and Computer Science
1. Introduction
New generation wireless communication services continue to demand higher and higher data rates from the
digital transmission system supporting them. The available bandwidth and the maximum radiated power are
limited by fundamental physical constraints as well as governmental legislations and regulations. Single-Input
Single-Output (SISO) antenna system where there is only one antenna at both transmitter and receiver suffers a
bottleneck in terms of capacity due to the Shannon-Nyquist criterion [1, 2]. Future wireless services however
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E-mail address: ******@yahoo.com, ******@gmail.com36 A Hybrid Mimo Technique for Better Ber in High Data Rate Wireless Communication System
demand much higher data bit-rate transmission with smaller bit error rate. In order to increase the capacity of
the SISO systems to meet such demand, the bandwidth and transmission power have to be increased
significantly, an almost impossible task.
Recently, a lot of research developments have shown that using Multiple Input Multiple Output (MIMO)
systems could increase the capacity in wireless communication substantially without increasing the
transmission power and bandwidth [3, 4]. There have been three typical approaches in the MIMO system and
these include spatial multiplexing (SM), spatial diversity and beamforming. The spatial diversity technique is
predominantly aimed at improving system reliability because it helps to combat channel fading, SM technique
is capable of increasing data transmission