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This work investigates the design scheme of orthogonal frequency division multiplexing (OFDM) training sequences with low peak to average power ratio (PAPR) under spectral constraints. Sequences with low PAPR can be used for synchronization and channel estimation in communication systems. In practical systems, there are always spectral constraints such as the reserved tones and DC-offset subcarriers...
Very high throughput (VHT) WLAN, known as IEEE 802.11ac, has attracted extensive attentions for achieving transmission rate over 1G bps. Due to the introduction of MU-MIMO and maximum 160MHz bandwidth transmission, the conventional carrier sensing mechanism emerges some drawbacks especially in the overlapping BSS scenario. In order to address the issue of redundant or useless network allocation vector...
The performance of the system with maximal ratio combining and multiuser scheduling is studied in the multiuser uplink in the presence of unequal power cochannel interferences from other cells. The channels of useful and interference signals are assumed to be Nakagami-m and Rayleigh fading. The closed form expressions for outage probability and average symbol error ratio (ASER) of system are derived...
The performance of dual-hop communication systems with fixed gain amplify-and-forward relay is analyzed over non-identical Nakagami-m fading channels. First, Closed-form expressions for outage probability and average symbol error rate (ASER) are derived based on probability density function (PDF) method for the system without cooperative diversity. Then, the expressions for outage probability and...
In multi-antenna wireless communications, spatial and temporal correlations always affect the performance of space-time codes (STC) designed for uncorrelated channels. In this paper, we use the Laplace transform and derive a closed-form expression for pairwise error probability (PEP) of STC over this double correlated fading channels. Numerical results show that the simple expression can achieve the...
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