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This paper presents the analysis of outage probability for dual-hop orthogonal frequency division multiplexing (OFDM) relay system with ordered subcarrier mapping (OSM) in Nakagami-m fading. Accurate closed-form expressions are derived for the outage probability while considering a fixed gain amplify-and-forward (AF) relay system. Two special cases of Nakagami-m fading, i.e., Rayleigh (m = 1) and...
This paper presents the analysis of BER and ergodic capacity for dual-hop orthogonal frequency division multiplexing (OFDM) Amplify-and-forward (AF) relay system with subcarrier mapping (SCM) in Nakagami-m fading channel for m ≤ 1. The performance of capacity-enhancement optimal pairing scheme, i.e., Best-to-Best (BTB) SCM scheme is analyzed for the two special cases of Nakagami-m fading, i.e., one...
Subcarrier mapping (SCM) is considered to be crucial for capacity-maximization in an orthogonal frequency division multiplexing (OFDM) relaying network. Although SCM in an OFDM system has been investigated extensively, nevertheless, the outage probability and outage capacity analysis of the system is not yet available in the literature. This paper presents the outage analysis of a dual-hop OFDM relay...
The OTA performance of Frequency Selective Scheduling (WiMAX Band AMC mode) is compared with that of Frequency Diverse Scheduling (WiMAX PUSC mode) as MS velocity is increased for Mobile WiMAX 802.16e. Frequency Selective Scheduling is shown to outperform Frequency Diverse Scheduling for velocities less than 15km/h and demonstrates upto 50% gain in throughput over the latter. The practical implications...
We consider the subcarrier allocation problem for multicast transmissions in the downlink for an OFDM-based wireless network. In conventional multicast transmissions, the data rate of a multicast group is dictated by the achievable data rate of the worst case user whose channel condition is the poorest. We develop a new technique called subcarrier pair allocation (SPA) to allocate OFDM subcarriers...
A novel two-dimensional differential demodulation (2-D DD) algorithm, which exploits both the time and frequency dimensions by using the orthogonal frequency division multiplexing (OFDM) frame structure, was investigated for 64-differential amplitude and phase shift keying (DAPSK) modulated OFDM signals. Without changing the transmitter, the proposed algorithm based on graph attempts to search for...
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