Optimized resource allocation of HSDPA using two group allocation in frequency selective channel

The interference-reduced energy loading for multi-code HSDPA systems

“…The successive interference cancelation receiver considered uses the despreading coefficient calculations based on (31). The system value and the energy relationship for the SIC constrained optimization receiver is based on (32).…”

“…Recently, an iterative power adaptation method known as the two-group resource allocation scheme has been developed in [30,31] to load two distinct discrete bit rates over the multi-code downlink channels subject to a constrained total transmission power. The twogroup resource allocation scheme [30,31] is integrated into the system value based power allocation method with the SIC scheme to improve the total downlink bit rate for a single user. In the following section a system model is given for the constrained optimization formulation when maximizing the total rate for multi-code downlink transmissions.…”

“…where the MMSE coefficients are calculated using (31). The decoded bit vector is then re-coded and re-modulated to regenerate the transmitted symbol vectorˆ x K .…”

“…As b p is selected from a discrete set, the total energy, E T may not be fully used as shown in [31]. The use of twogroup allocation was suggested to increase the total rate to R T = (K -m)b p + mb p+1 .…”

“…To search for the optimum b p and m values, the total number of matrix inversions required in [31] is (P + K -1)I max , where PI max iterations are required to determine b p , while (K -1)I max iterations are required to determine m. The optimum b p is found as follows:…”