Abstract
In wireless local area networks (WLANs), the data transmission rate is highly wavering concerning time according to changes in the channel environment. The traditional link adaptation algorithms, which rely on channel state information (CSI) estimation for selecting an appropriate modulation-coding scheme (MCS) does not thrive with madly varying channel conditions. To uphold this problem, in this paper we contemplate the link adaptation problem in IEEE 802.11n based WLAN by evaluating the performance under different combinations of transmission parameters or transmit modes. The evaluation results show that an optimal selection of transmission mode on a per-packet basis according to the current channel state maximizes the throughput performance of WLAN. Simulations over a wide class of TGn fading channel model shows that significant improvement in the throughput is possible by selecting an optimal combination of transmission parameters adaptively on a per-packet basis according to SNR estimation made at receiver.
Highlights
Wireless communication suffers greatly from vast instability in the radio environment between the access points (AP) and communicating node
In this paper the throughput and bit error rate (BER) performance of IEEE 802.11n based wireless local area networks (WLANs) is tested under different combination of physical parameters
The average throughput performance of WLAN with different transmission modes calculated over smaller signal to noise ratio (SNR) bins are presented in tables V to VII
Summary
Wireless communication suffers greatly from vast instability in the radio environment between the access points (AP) and communicating node. The link adaptation proposals for legacy WLAN standards such as IEEE 802.11a/b/g work out to be less effective for 802.11n. The recent link adaptation proposal ARAMIS [4] which jointly adapts data rate and channel bandwidth, has significantly increased throughput. The adaptive proposal for 802.11n based WLAN called MiSer [7] uses a rate-power pair’s lookup table for link appropriate switching between rate-power combinations for maximizing throughput. The interference aware adaptation algorithm introduced in [8] jointly adapts rate and channel All these link adaptation schemes are based on the estimation of CSI or received signal strength indicator (RSSI). In this paper the throughput and BER performance of IEEE 802.11n based WLAN is tested under different combination of physical parameters. The objective of this paper is to determine an optimal combination of transmission parameters for different SNR bins
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