Abstract
With the fast progress of MIMO technology and its growing applications in the mobile ad hoc networks, it is important to develop a technique to enable more efficient MIMO implemented mobile ad hoc network. The simple, yet powerful concept of an bit error rate (BER) performance calculation with respect to bit energy to noise spectral density ratio (Eb/N0) of a typical transmit diversity scheme with various number of transmit and receiving antennas. Different diversity technique for mimo based mobile ad hoc network using space time block codes are demonstrated to show the superiority in performance of MIMO over single-antenna routing schemes, particularly at high SNR.
Highlights
Diversity is a bandwidth efficient method for mitigating the negative effects of fading
Unlike receive diversity that can be achieved by performing the diversity combining at the receiver side, transmit diversity requires some form of signal processing, generally known as space time coding, on the transmitted signals in order to achieve signal enhancement at the receiver
Before we introduce the transmit diversity scheme based on Space-Time Block Code (STBC), we first review the traditional receive diversity scheme with maximal ratio combining (MRC) for one transmit antenna and two receive antennas
Summary
Diversity is a bandwidth efficient method for mitigating the negative effects of fading. Diversity can be achieved by using multiple transmit antennas and by coding the signal over both space and time (or frequency), through e.g. Space-Time Block Coding (STBC) scheme [3]. If the fading is slow, that is the coherence time of the channel is large, the separation between time slots used for temporal diversity is high In this case, the receiver suffers from a huge delay before it can start the process of decoding. The carrier frequencies should be separated by more than the coherence bandwidth of the channel In this case, different replicas of the signal experience independent fades. The use of multiple antennas may not be possible in small handheld devices This is because of the fact that a minimum physical separation is needed between different antennas to achieve spatial diversity. If the signal goes through random reflections, its polarization state can be independent of the transmitted polarization
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