Convergence properties of iterative soft onion peeling

Analysis and optimization of CDMA systems with chip-level interleavers

“…Therefore, in (14) is a function of the input SNR . We express this function as (16) We also define the bit-error rate (BER) performance for the as a function of as (17) Both and can be obtained by the Monte Carlo method similar to [4], [13], [14], and [18]. Fig.…”

“…2 shows two examples of and . One is for a length- 16 repetition code, and the other is for a concatenation of a rate-1/2 convolutional code with generator polynomials followed by a length-8 repetition code. In general, both and are decreasing functions of over with , , , and .…”

“…The intuition is that the strong power users can converge first and benefit the weak power users. For ideal codes or "good" codes, perfect or near perfect cancellation can be made with a successive stripping technique [16], [17]. However, for "poor" codes, the stripping technique may result in an excessive amount of energy use.…”

“…This principle has been further studied in [16]- [18]. In this paper, we will show that CDMA with chip-level interleavers provides a very simple and efficient framework to realize the principle.…”

Analysis and design of IDMA systems based on SNR evolution and power allocation

“…Different approaches have been investigated. For ideal (or nearly ideal) forward error control (FEC) codes, successive stripping [6] [9] (or "onion peeling" [7]) can be used. For more practical codes, power allocation for iterative multiuser detection has been discussed [8].…”