OFDM and MC‐CDMA for Broadband Multi‐User Communications, WLANs and Broadcasting

Simulated Annealing based multiuser detection for synchronous SDMA system

“…More specifically, the estimated signal vector x ∈ C L×1 is generated from the received signal vector y, as follows [1]…”

“…ML MUD [1] is the optimal scheme, which invokes exhaustive search, and requires 2 mL evaluations of the Objective Function Metric (OFM) of (8) for finding the most likely transmitted symbol vectorx ML , and…”

“…Specifically, in practical use, a trial set M t containing ( 1 3 ∼ 1 2 ) · 2 mL number of vectors is generated firstly, which is composed of x 0 and its alterations. In this paper, the size of M t is 1 2 · 2 mL and…”

“…By contrast, ML MUD can provide the best performance by invoking an exhaustive search, whose computational complexity increases exponentially with the number of simultaneous users supported by the Multiple Input-Multiple Output (MIMO) system, so that its implementation in high-user-loaded scenario is strongly prohibited. As a compromise between performance and complexity, a range of suboptimal MUDs are proposed in many literatures [1], e.g. Successive Interference Cancellation (SIC) and Parallel Interference Cancellation (PIC), which present better performance than LS and MMSE at the cost of sustainable complexity increase.…”

Low complexity approximate log-MAP detection for MIMO systems

“…Multi-Carrier (MC) modulation techniques [1,2] have found their way into several wireless broadband communications standards as well as into local area networks. Owing to their advantageous properties they also constitute strong contenders for the next-generation cellular mobile communications standards.…”